English Vocabulary · Grade 9 Live Review Preview

9th Grade Vocabulary Words

Ninth grade marks the transition to high-school reading and writing across literature, argument, research, biology, physical and Earth science, algebra, computing, world history, civics, and geography. This level develops precise academic and domain-specific vocabulary while strengthening context, nuance, source evaluation, figurative language, and evidence-based communication.

This independently authored 800-word beta curriculum is arranged in twenty-three pages of up to thirty-five words. Pages containing words 1–500 include five cloze questions drawn only from that enhanced range; words 501–800 remain fully visible and editable as list pages while the expanded practice layer is developed. Each row includes a subject-field label and an editable word-study note about a transparent affix, compound structure, capitalization, or dictionary base form. The cited Grade 9 resources calibrate difficulty and study skills only; all learner-facing definitions, examples, quizzes, and descriptions are original KSSR copy.

Please note: the vocabulary lists for grades 9~11 have been selected to ensure no overlap with the previous grade level. If the words are too specialized or difficult for you, please go back to grade levels 4~8 and review the words on those pages.

Return to interactive study tools

Complete text list

All 800 words are included below as ordinary HTML. This view does not require JavaScript.

Page 1: words 1–35

Vocabulary page 1
#	Word	Details	Meaning	Sample sentence
1	abstraction	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Suffix focus: -tion commonly forms a noun naming an action, process, or result.	an idea formed by considering common qualities rather than one concrete example	Freedom is an abstraction that different societies define in different ways.
2	traceability	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Suffix focus: -ability forms a noun for the capacity to have a quality or perform an action.	the ability to follow information or an item back through its recorded history	Batch numbers provide traceability from a packaged food to the factory that produced it.
3	acquisition	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Suffix focus: -ition commonly forms a noun naming an action, process, or result.	the process of gaining knowledge, skill, or possession of something	Regular conversation supports the acquisition of a new language.
4	adequacy	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Base-form focus: adequacy is the dictionary headword; compare its inflected or derived forms in context.	the quality of being sufficient for a particular need or standard	The committee questioned the adequacy of the building's fire exits.
5	annotation	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Suffix focus: -ation commonly forms a noun naming an action, process, or result.	a note added to a text to explain, question, or connect an idea	Her annotation beside the graph identifies a sudden change in the trend.
6	anticipation	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Suffix focus: -ation commonly forms a noun naming an action, process, or result.	the act of expecting or preparing for something that may happen	In anticipation of heavy rain, workers cleared leaves from the drains.
7	applicability	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Suffix focus: -ability forms a noun for the capacity to have a quality or perform an action.	the degree to which an idea or rule is useful in a particular situation	The scientist discussed the applicability of the small study to a larger population.
8	assessment	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Suffix focus: -ment commonly forms a noun for an action, process, state, or result.	a careful judgment based on gathered information	The engineer's assessment found that the old bridge needed immediate repair.
9	authenticity	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Suffix focus: -ity commonly forms a noun naming a quality, state, or condition.	the quality of being genuine, accurate, or true to its claimed origin	Experts tested the ink to determine the letter's authenticity.
10	causation	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Suffix focus: -ation commonly forms a noun naming an action, process, or result.	a relationship in which one event directly produces another	A correlation between two trends does not by itself prove causation.
11	comparability	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Suffix focus: -ability forms a noun for the capacity to have a quality or perform an action.	the degree to which two or more things can be fairly compared	Using the same measurement method improves comparability between the experiments.
12	compilation	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Suffix focus: -ation commonly forms a noun naming an action, process, or result.	a collection assembled from several sources	The archive published a compilation of diaries from the expedition.
13	conceptualization	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Suffix focus: -ization forms a noun for a process of making or becoming.	the process of forming a clear idea or model of something	Her conceptualization of the problem changed after she interviewed local residents.
14	consistency	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Base-form focus: consistency is the dictionary headword; compare its inflected or derived forms in context.	the quality of remaining logically compatible or behaving in a similar way	Reviewers checked the report for consistency between its tables and conclusions.
15	corpus	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Base-form focus: corpus is the dictionary headword; compare its inflected or derived forms in context.	a large organized collection of written or spoken language used for study	Linguists searched the corpus to see how the expression changed over time.
16	cross-check	verb Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Term structure: cross + check. Study the complete expression as one field-specific unit.	to verify information by comparing it with another independent source	Before publishing the date, the reporter will cross-check it against the court record.
17	deductive reasoning	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Term structure: deductive + reasoning. Study the complete expression as one field-specific unit.	reasoning that applies a general rule to reach a specific conclusion	Deductive reasoning shows that if all metals conduct heat and copper is a metal, copper conducts heat.
18	descriptive statistics	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Term structure: descriptive + statistics. Study the complete expression as one field-specific unit.	numbers that summarize the main features of a set of data	The report uses descriptive statistics such as the mean and range to summarize survey results.
19	evidence hierarchy	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Term structure: evidence + hierarchy. Study the complete expression as one field-specific unit.	a ranking of evidence according to its reliability for a particular question	In medicine, an evidence hierarchy usually places systematic research above personal anecdotes.
20	fact-checking	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Term structure: fact + checking. Study the complete expression as one field-specific unit.	the process of testing a claim against reliable evidence	Careful fact-checking revealed that the viral photograph came from an earlier event.
21	generalizability	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Suffix focus: -ability forms a noun for the capacity to have a quality or perform an action.	the extent to which findings apply beyond the people or situation studied	A study of ten volunteers has limited generalizability to an entire country.
22	inductive reasoning	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Term structure: inductive + reasoning. Study the complete expression as one field-specific unit.	reasoning that forms a general conclusion from repeated observations	Through inductive reasoning, the botanist proposed a pattern after observing many plants.
23	information literacy	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Term structure: information + literacy. Study the complete expression as one field-specific unit.	the ability to locate, evaluate, use, and communicate information responsibly	Information literacy helps students distinguish a reliable report from a misleading post.
24	logical consistency	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Term structure: logical + consistency. Study the complete expression as one field-specific unit.	the quality of having ideas that do not contradict one another	The argument lacks logical consistency because its conclusion rejects its first premise.
25	media literacy	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Term structure: media + literacy. Study the complete expression as one field-specific unit.	the ability to analyze how media messages are created, funded, and interpreted	Media literacy encourages viewers to ask who produced an advertisement and why.
26	objectivity	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Suffix focus: -ity commonly forms a noun naming a quality, state, or condition.	the effort to base judgment on evidence rather than personal preference	Using a scoring guide can improve objectivity when several judges evaluate the same work.
27	peer-reviewed	adjective Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Term structure: peer + reviewed. Study the complete expression as one field-specific unit.	evaluated by qualified specialists before publication	The student chose a peer-reviewed article instead of an unsigned blog post.
28	qualifier	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Base-form focus: qualifier is the dictionary headword; compare its inflected or derived forms in context.	a word or phrase that limits the strength or scope of a statement	The qualifier “in most cases” prevents the claim from sounding absolute.
29	reproducibility	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Suffix focus: -ibility forms a noun for the capacity to have a quality or perform an action.	the ability of other researchers to obtain comparable results by following the same method	Detailed procedures allow scientists to test the reproducibility of an experiment.
30	research question	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Term structure: research + question. Study the complete expression as one field-specific unit.	a focused question that guides an investigation	The research question asks how street lighting affects moth populations.
31	scholarly	adjective Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Base-form focus: scholarly is the dictionary headword; compare its inflected or derived forms in context.	based on careful academic study and written for an informed audience	A scholarly article normally cites the evidence on which its claims depend.
32	source criticism	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Term structure: source + criticism. Study the complete expression as one field-specific unit.	the evaluation of a source's origin, purpose, context, and reliability	Source criticism helped the historian recognize that the speech was political propaganda.
33	statistical significance	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Term structure: statistical + significance. Study the complete expression as one field-specific unit.	evidence that an observed result is unlikely to be caused by random chance alone	The trial found statistical significance, but researchers still considered whether the effect was useful.
34	systematic review	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Term structure: systematic + review. Study the complete expression as one field-specific unit.	a study that gathers and evaluates all suitable research on a focused question	A systematic review compared dozens of trials on the same treatment.
35	triangulation	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Suffix focus: -ation commonly forms a noun naming an action, process, or result.	the use of several methods or sources to examine the same question	The journalist used triangulation by comparing interviews, photographs, and official records.

Judging a Research Claim

Reading practice for pages 1–3. Five relevant words are highlighted.

English reading

A peer-reviewed study begins with careful conceptualization: researchers define exactly what they intend to measure. An abstraction such as “community trust” must become observable questions or behaviors. Objectivity does not mean researchers lack perspectives; it means they use transparent methods and apply them with consistency so other scholars can evaluate the claim.

Reading comprehension

1. What happens during conceptualization?

Researchers define what they intend to measure.

2. Why must an abstraction become observable?

Observable measures allow the idea to be studied.

3. How do researchers support objectivity?

They use transparent methods consistently.

Cloze vocabulary quiz

1. Her ___ of the problem changed after she interviewed local residents.

Answer: conceptualization

2. Using a scoring guide can improve ___ when several judges evaluate the same work.

Answer: objectivity

3. Freedom is an ___ that different societies define in different ways.

Answer: abstraction

4. Reviewers checked the report for ___ between its tables and conclusions.

Answer: consistency

5. The student chose a ___ article instead of an unsigned blog post.

Answer: peer-reviewed

Page 2: words 36–70

Vocabulary page 2
#	Word	Details	Meaning	Sample sentence
36	verifiability	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Suffix focus: -ability forms a noun for the capacity to have a quality or perform an action.	the quality of being capable of confirmation through evidence or observation	A precise citation increases the verifiability of a historical claim.
37	working hypothesis	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Term structure: working + hypothesis. Study the complete expression as one field-specific unit.	a provisional explanation used to guide further investigation	The team treated soil acidity as a working hypothesis rather than a proven cause.
38	exemplification	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Suffix focus: -ation commonly forms a noun naming an action, process, or result.	the use of a specific example to explain or support a general point	The essay uses exemplification by describing one neighborhood that reduced food waste.
39	qualification	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Suffix focus: -ation commonly forms a noun naming an action, process, or result.	a limitation or condition added to make a statement more accurate	The author adds a qualification because the policy does not affect every resident equally.
40	concession	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Suffix focus: -sion commonly forms a noun naming an action, process, or result.	an acknowledgment that part of an opposing position has merit	The debate response begins with a concession that the proposal would require extra funding.
41	rebuttal	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Base-form focus: rebuttal is the dictionary headword; compare its inflected or derived forms in context.	a reasoned answer that challenges an opposing claim	Her rebuttal shows that the cited survey excluded rural voters.
42	assertion	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Suffix focus: -tion commonly forms a noun naming an action, process, or result.	a confident statement presented as true	The article makes the assertion that the lake is clean but provides no water-quality data.
43	coherence	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Suffix focus: -ence commonly forms a noun naming an action, quality, or state.	the quality of forming a clear and logically connected whole	Repeated key terms give the essay coherence from one paragraph to the next.
44	supporting detail	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Term structure: supporting + detail. Study the complete expression as one field-specific unit.	a fact, example, explanation, or description that develops a main idea	The temperature record is a supporting detail for the paragraph about climate change.
45	peer review	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Term structure: peer + review. Study the complete expression as one field-specific unit.	evaluation of work by people with relevant knowledge at a similar professional level	Peer review prompted the researcher to clarify how participants were selected.
46	intellectual property	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Term structure: intellectual + property. Study the complete expression as one field-specific unit.	creative work or invention protected as belonging to its creator	A patent is one way the law can protect intellectual property.
47	paraphrasing	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Base-form focus: paraphrasing is the dictionary headword; compare its inflected or derived forms in context.	restating an idea fully in new wording while preserving its meaning	Effective paraphrasing changes both the vocabulary and the sentence structure of the source.
48	close reading	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Term structure: close + reading. Study the complete expression as one field-specific unit.	careful analysis of a text's words, structure, and details	A close reading of the final stanza reveals a shift from anger to acceptance.
49	context clue	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Term structure: context + clue. Study the complete expression as one field-specific unit.	information near an unfamiliar word that helps a reader infer its meaning	The phrase “unable to bend” provides a context clue for the word rigid.
50	reference work	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Term structure: reference + work. Study the complete expression as one field-specific unit.	a source designed for consultation, such as a dictionary, atlas, or encyclopedia	An etymological dictionary is a reference work for studying word origins.
51	root word	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Term structure: root + word. Study the complete expression as one field-specific unit.	a basic word from which related words are formed	Help is the root word in helpful and helpless.
52	conclusive	adjective Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Suffix focus: -ive commonly forms an adjective meaning having a quality or tendency.	strong enough to settle a question or prove a result	One blurry photograph is not conclusive evidence that the rare bird has returned.
53	scrutiny	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Base-form focus: scrutiny is the dictionary headword; compare its inflected or derived forms in context.	close and critical examination	The budget came under scrutiny after auditors found several unexplained payments.
54	rationale	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Base-form focus: rationale is the dictionary headword; compare its inflected or derived forms in context.	the reasoning that explains a decision, method, or belief	The proposal states the rationale for preserving the wetland.
55	corroboration	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Suffix focus: -ation commonly forms a noun naming an action, process, or result.	independent evidence that supports a statement or finding	Phone records provided corroboration for the witness's account.
56	affirmative case	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Term structure: affirmative + case. Study the complete expression as one field-specific unit.	the organized arguments and evidence supporting a debate proposition	The affirmative case argues that later school start times improve student health.
57	burden of proof	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Term structure: burden + of + proof. Study the complete expression as one field-specific unit.	the responsibility to provide enough evidence for a claim	A person making an extraordinary accusation carries the burden of proof.
58	causal claim	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Term structure: causal + claim. Study the complete expression as one field-specific unit.	a statement that one event or condition produces another	The causal claim requires stronger evidence than the observation that two trends occur together.
59	counterevidence	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Suffix focus: -ence commonly forms a noun naming an action, quality, or state.	information that weakens or contradicts a claim	The colder years provide counterevidence to the proposed simple pattern.
60	counterpoint	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Prefix focus: counter- means against, opposing, or responding to.	a contrasting idea presented beside another for comparison	The memoir offers a counterpoint to the official version of the event.
61	faulty reasoning	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Term structure: faulty + reasoning. Study the complete expression as one field-specific unit.	thinking that contains a logical error or unsupported connection	The claim that one rainy day disproves climate change relies on faulty reasoning.
62	false analogy	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Term structure: false + analogy. Study the complete expression as one field-specific unit.	a comparison that treats importantly different things as if they were alike	Comparing a school to a prison is a false analogy when the differences are ignored.
63	false dilemma	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Term structure: false + dilemma. Study the complete expression as one field-specific unit.	an argument that presents only two choices when other options exist	The statement “support this plan or oppose all progress” creates a false dilemma.
64	hasty generalization	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Term structure: hasty + generalization. Study the complete expression as one field-specific unit.	a broad conclusion drawn from too little or unrepresentative evidence	Judging an entire city by one unpleasant visit is a hasty generalization.
65	loaded language	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Term structure: loaded + language. Study the complete expression as one field-specific unit.	wording chosen to provoke strong emotion or judgment	Calling a small fee an “outrageous theft” uses loaded language.
66	logical appeal	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Term structure: logical + appeal. Study the complete expression as one field-specific unit.	a persuasive strategy based on reasons, facts, and evidence	The report's logical appeal rests on cost comparisons and safety data.
67	emotional appeal	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Term structure: emotional + appeal. Study the complete expression as one field-specific unit.	a persuasive strategy designed to influence an audience's feelings	The rescue photograph creates an emotional appeal for donations.
68	ethical appeal	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Term structure: ethical + appeal. Study the complete expression as one field-specific unit.	a persuasive strategy based on the speaker's credibility or moral character	The physician builds an ethical appeal by describing her relevant experience and standards.
69	reasoned judgment	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Term structure: reasoned + judgment. Study the complete expression as one field-specific unit.	a decision reached by weighing evidence and relevant principles	After comparing the risks and benefits, the panel issued a reasoned judgment.
70	rebuttal evidence	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Term structure: rebuttal + evidence. Study the complete expression as one field-specific unit.	facts or examples used to answer an opposing argument	The later census figures serve as rebuttal evidence against the population claim.

Page 2 vocabulary review

Review five selected words from page 2.

Cloze vocabulary quiz

1. The essay uses ___ by describing one neighborhood that reduced food waste.

Answer: exemplification

2. Help is the ___ in helpful and helpless.

Answer: root word

3. Judging an entire city by one unpleasant visit is a ___.

Answer: hasty generalization

4. The author adds a ___ because the policy does not affect every resident equally.

Answer: qualification

5. One blurry photograph is not ___ evidence that the rare bird has returned.

Answer: conclusive

Page 3: words 71–105

Vocabulary page 3
#	Word	Details	Meaning	Sample sentence
71	refutation	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Suffix focus: -ation commonly forms a noun naming an action, process, or result.	a demonstration that a claim or argument is false	The laboratory result provided a refutation of the rumor about contaminated water.
72	rhetorical situation	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Term structure: rhetorical + situation. Study the complete expression as one field-specific unit.	the relationship among a speaker, audience, purpose, message, and context	Understanding the rhetorical situation explains why the mayor used a formal tone.
73	scope	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Base-form focus: scope is the dictionary headword; compare its inflected or derived forms in context.	the range or boundaries of a subject, study, or activity	The paper narrows its scope to public transportation in three coastal cities.
74	synthesis matrix	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Term structure: synthesis + matrix. Study the complete expression as one field-specific unit.	a chart that organizes several sources by shared themes or questions	A synthesis matrix helped Noor compare how four authors discussed water access.
75	thesis statement	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Term structure: thesis + statement. Study the complete expression as one field-specific unit.	a sentence that states an essay's central claim or controlling idea	The thesis statement argues that the novel treats memory as both a gift and a burden.
76	citation trail	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Term structure: citation + trail. Study the complete expression as one field-specific unit.	the chain of sources revealed by following references from one work to another	Following the citation trail led the researcher to the original 1987 study.
77	integrated quotation	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Term structure: integrated + quotation. Study the complete expression as one field-specific unit.	quoted words fitted grammatically into a writer's own sentence	An integrated quotation supports the paragraph without interrupting its flow.
78	signal phrase	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Term structure: signal + phrase. Study the complete expression as one field-specific unit.	words that introduce a source and identify its speaker or author	The signal phrase “According to marine biologist Ana Ruiz” establishes the source's expertise.
79	parenthetical citation	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Term structure: parenthetical + citation. Study the complete expression as one field-specific unit.	brief source information placed in parentheses within a text	The parenthetical citation directs readers to the matching entry in the works cited list.
80	works cited	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Term structure: works + cited. Study the complete expression as one field-specific unit.	an alphabetical list of sources actually referenced in a piece of writing	The works cited gives publication details for every article quoted in the essay.
81	source note	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Term structure: source + note. Study the complete expression as one field-specific unit.	a brief statement identifying where information, an image, or a quotation originated	The map's source note credits the national geological survey.
82	revision plan	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Term structure: revision + plan. Study the complete expression as one field-specific unit.	a specific strategy for improving the ideas and organization of a draft	Her revision plan begins with strengthening the counterargument and reorganizing two paragraphs.
83	peer feedback	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Term structure: peer + feedback. Study the complete expression as one field-specific unit.	comments from classmates or colleagues intended to improve a work in progress	Peer feedback showed that the explanation needed a clearer example.
84	sentence fluency	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Term structure: sentence + fluency. Study the complete expression as one field-specific unit.	the smooth rhythm and readable movement of sentences in a text	Varying sentence length improved the paragraph's sentence fluency.
85	parallel structure	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Term structure: parallel + structure. Study the complete expression as one field-specific unit.	the use of matching grammatical forms for ideas of equal importance	“To learn, to question, and to grow” uses parallel structure.
86	logical progression	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Term structure: logical + progression. Study the complete expression as one field-specific unit.	an order in which each idea follows reasonably from the one before it	The report has a logical progression from the problem to its causes and possible solutions.
87	transitional phrase	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Term structure: transitional + phrase. Study the complete expression as one field-specific unit.	a group of words that shows how one idea relates to another	The transitional phrase “on the other hand” introduces a contrast.
88	topic development	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Term structure: topic + development. Study the complete expression as one field-specific unit.	the process of explaining and supporting a paragraph's controlling idea	Facts alone do not create topic development unless the writer explains their significance.
89	formal tone	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Term structure: formal + tone. Study the complete expression as one field-specific unit.	a serious and conventional style suited to academic or professional contexts	The application letter maintains a formal tone by avoiding slang.
90	specificity	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Suffix focus: -ity commonly forms a noun naming a quality, state, or condition.	the quality of being exact and detailed rather than vague	Replacing “things got better” with measured results adds specificity.
91	source synthesis	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Term structure: source + synthesis. Study the complete expression as one field-specific unit.	the process of combining related ideas from several sources into a new understanding	Her source synthesis compares the studies instead of summarizing each one separately.
92	citation ethics	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Term structure: citation + ethics. Study the complete expression as one field-specific unit.	principles for crediting sources honestly and representing their ideas accurately	Citation ethics requires a writer to identify both direct quotations and paraphrased ideas.
93	research ethics	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Term structure: research + ethics. Study the complete expression as one field-specific unit.	principles that protect participants, honesty, and fairness during investigation	Research ethics requires informed consent before collecting private interview data.
94	data provenance	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Term structure: data + provenance. Study the complete expression as one field-specific unit.	a record of where data originated and how it was collected or changed	The repository preserves data provenance by naming the sensor, date, and processing steps.
95	sample bias	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Term structure: sample + bias. Study the complete expression as one field-specific unit.	distortion that occurs when a sample does not fairly represent the intended population	Surveying only morning commuters introduces sample bias into a study of all transit riders.
96	selection bias	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Term structure: selection + bias. Study the complete expression as one field-specific unit.	distortion caused by the way people or items are chosen for study	Allowing volunteers to choose their own treatment group can create selection bias.
97	confirmation bias	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Term structure: confirmation + bias. Study the complete expression as one field-specific unit.	the tendency to favor information that supports an existing belief	Confirmation bias may lead a reader to ignore evidence that challenges an opinion.
98	publication bias	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Term structure: publication + bias. Study the complete expression as one field-specific unit.	distortion caused when studies with striking results are more likely to be published	Publication bias can make a treatment appear more effective than the complete evidence shows.
99	conflict of interest	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Term structure: conflict + of + interest. Study the complete expression as one field-specific unit.	a situation in which personal benefit could influence professional judgment	The reviewer disclosed a conflict of interest because she owned stock in the company.
100	replication study	noun Study Field: Grade 9 research, reasoning, and source-literacy term Word study: Term structure: replication + study. Study the complete expression as one field-specific unit.	an investigation that repeats an earlier method to test whether its result occurs again	A replication study found the same effect in a different city and age group.
101	narratology	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Root and suffix focus: -logy means the study of a subject.	the systematic study of how stories are structured and communicated	Narratology examines how changes in time and point of view shape a reader's experience.
102	focalization	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Suffix focus: -ization forms a noun for a process of making or becoming.	the perspective through which narrative information is perceived	The chapter uses the child's focalization, so readers notice details that matter to her.
103	narrative distance	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Term structure: narrative + distance. Study the complete expression as one field-specific unit.	the degree of closeness between a narrator's voice and a character's experience	Short, urgent thoughts reduce the narrative distance during the escape scene.
104	narrative reliability	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Term structure: narrative + reliability. Study the complete expression as one field-specific unit.	the extent to which a storyteller's account can be trusted	Conflicting dates make the narrator's narrative reliability increasingly doubtful.
105	nonlinear narrative	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Term structure: nonlinear + narrative. Study the complete expression as one field-specific unit.	a story that presents events outside straightforward chronological order	The nonlinear narrative moves between the trial and memories of the earlier voyage.

Page 3 vocabulary review

Review five selected words from page 3.

Cloze vocabulary quiz

1. Following the ___ led the researcher to the original 1987 study.

Answer: citation trail

2. The application letter maintains a ___ by avoiding slang.

Answer: formal tone

3. The chapter uses the child's ___, so readers notice details that matter to her.

Answer: focalization

4. An ___ supports the paragraph without interrupting its flow.

Answer: integrated quotation

5. Replacing “things got better” with measured results adds ___.

Answer: specificity

Page 4: words 106–140

Vocabulary page 4
#	Word	Details	Meaning	Sample sentence
106	flash-forward	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Term structure: flash + forward. Study the complete expression as one field-specific unit.	a scene that interrupts the present action to show a later event	A brief flash-forward reveals the abandoned town twenty years after the storm.
107	in medias res	adverb Study Field: Grade 9 literature, rhetoric, and language term Word study: Term structure: in + medias + res. Study the complete expression as one field-specific unit.	beginning a story in the middle of its action	The epic opens in medias res, with the sailors already trapped in the whirlpool.
108	parallel plot	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Term structure: parallel + plot. Study the complete expression as one field-specific unit.	one of two or more story lines that develop beside each other and illuminate shared ideas	The immigrant daughter's journey forms a parallel plot with her grandmother's wartime escape.
109	braided narrative	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Term structure: braided + narrative. Study the complete expression as one field-specific unit.	a work that alternates among several connected story lines or voices	The braided narrative joins three families through the history of one house.
110	narrative reversal	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Term structure: narrative + reversal. Study the complete expression as one field-specific unit.	a major change that redirects a story or overturns expectations	The apparent villain's rescue of the hero creates a narrative reversal.
111	story world	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Term structure: story + world. Study the complete expression as one field-specific unit.	the imagined setting, history, rules, and inhabitants of a narrative	Maps and legends make the fantasy's story world feel internally consistent.
112	narrative frame	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Term structure: narrative + frame. Study the complete expression as one field-specific unit.	an outer situation that surrounds and introduces a story told within it	The interview provides a narrative frame for the explorer's recollections.
113	narrative pace	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Term structure: narrative + pace. Study the complete expression as one field-specific unit.	the apparent speed at which a story moves through events	Brief sentences and omitted details quicken the narrative pace during the chase.
114	scene summary	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Term structure: scene + summary. Study the complete expression as one field-specific unit.	compressed narration that reports events rather than presenting them moment by moment	A scene summary covers the uneventful months between the two expeditions.
115	temporal shift	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Term structure: temporal + shift. Study the complete expression as one field-specific unit.	a movement from one time period to another within a text	The phrase “years earlier” signals a temporal shift into the character's childhood.
116	retrospective narration	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Term structure: retrospective + narration. Study the complete expression as one field-specific unit.	storytelling in which a narrator looks back on completed events	Retrospective narration allows the older speaker to question his youthful decisions.
117	unfolding narration	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Term structure: unfolding + narration. Study the complete expression as one field-specific unit.	storytelling that presents events as the narrator experiences them	Unfolding narration limits the reader to clues available in the immediate moment.
118	omniscient narrator	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Term structure: omniscient + narrator. Study the complete expression as one field-specific unit.	a storyteller who can reveal the thoughts and experiences of many characters	The omniscient narrator moves from the captain's fear to the crew's private doubts.
119	limited narrator	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Term structure: limited + narrator. Study the complete expression as one field-specific unit.	a storyteller whose knowledge stays close to one character's perceptions	Because the limited narrator follows Mei, the reader does not know what her rival planned.
120	objective narrator	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Term structure: objective + narrator. Study the complete expression as one field-specific unit.	a storyteller who reports observable actions and speech without revealing private thoughts	The objective narrator describes the argument but never explains either person's feelings.
121	anaphora	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Base-form focus: anaphora is the dictionary headword; compare its inflected or derived forms in context.	repetition of a word or phrase at the beginnings of successive clauses or lines	The speech uses anaphora in “We will study, we will organize, we will act.”
122	epistrophe	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Base-form focus: epistrophe is the dictionary headword; compare its inflected or derived forms in context.	repetition of a word or phrase at the ends of successive clauses or lines	The speaker uses epistrophe by ending three sentences with “for our children.”
123	antimetabole	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Base-form focus: antimetabole is the dictionary headword; compare its inflected or derived forms in context.	repetition of words in reverse grammatical order	“We shape our tools, and our tools shape us” is an antimetabole.
124	chiasmus	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Base-form focus: chiasmus is the dictionary headword; compare its inflected or derived forms in context.	a reversed arrangement of grammatical structures or ideas	The phrase “She has all my love; my heart belongs to her” forms a chiasmus.
125	asyndeton	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Base-form focus: asyndeton is the dictionary headword; compare its inflected or derived forms in context.	deliberate omission of conjunctions between related words or clauses	The command “Run, hide, wait” uses asyndeton to create urgency.
126	polysyndeton	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Prefix focus: poly- means many.	deliberate repetition of conjunctions between words or clauses	The sentence links “rain and wind and darkness” with polysyndeton to prolong the storm.
127	litotes	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Base-form focus: litotes is the dictionary headword; compare its inflected or derived forms in context.	understatement that affirms an idea by denying its opposite	Calling the championship victory “not a small achievement” uses litotes.
128	aporia	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Base-form focus: aporia is the dictionary headword; compare its inflected or derived forms in context.	a deliberate expression of doubt or uncertainty used for reflection or persuasion	The essay uses aporia when the narrator asks whether any choice could have been just.
129	synesthesia	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Base-form focus: synesthesia is the dictionary headword; compare its inflected or derived forms in context.	figurative language that describes one sense through terms associated with another	The phrase “a sharp yellow note” uses synesthesia by combining sight and sound.
130	implied metaphor	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Term structure: implied + metaphor. Study the complete expression as one field-specific unit.	a comparison suggested through word choice without directly naming both things	“The rumor spread its wings” contains an implied metaphor comparing the rumor to a bird.
131	conceit	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Base-form focus: conceit is the dictionary headword; compare its inflected or derived forms in context.	an elaborate and sustained comparison between notably different things	The poem develops a conceit that compares memory to a many-roomed house.
132	sensory imagery	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Term structure: sensory + imagery. Study the complete expression as one field-specific unit.	language that appeals to one or more physical senses	Sensory imagery lets readers hear the shutters and smell smoke from the fire.
133	visual imagery	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Term structure: visual + imagery. Study the complete expression as one field-specific unit.	descriptive language that creates a picture in the reader's mind	Visual imagery presents the moon as a silver coin above black roofs.
134	auditory imagery	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Term structure: auditory + imagery. Study the complete expression as one field-specific unit.	descriptive language that evokes sound	Auditory imagery captures the hiss of rain against the windows.
135	tactile imagery	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Term structure: tactile + imagery. Study the complete expression as one field-specific unit.	descriptive language that evokes touch, texture, or temperature	Tactile imagery makes the icy railing feel painfully cold.
136	olfactory imagery	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Term structure: olfactory + imagery. Study the complete expression as one field-specific unit.	descriptive language that evokes smell	Olfactory imagery fills the kitchen with cinnamon and wood smoke.
137	gustatory imagery	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Term structure: gustatory + imagery. Study the complete expression as one field-specific unit.	descriptive language that evokes taste	Gustatory imagery emphasizes the bitter peel and sweet fruit.
138	symbolic pattern	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Term structure: symbolic + pattern. Study the complete expression as one field-specific unit.	a repeated arrangement of images or events that carries an additional meaning	The recurring locked doors form a symbolic pattern of exclusion.
139	recurring motif	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Term structure: recurring + motif. Study the complete expression as one field-specific unit.	an image, phrase, situation, or idea repeated throughout a work	The migrating birds become a recurring motif connected to freedom.
140	free indirect discourse	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Term structure: free + indirect + discourse. Study the complete expression as one field-specific unit.	third-person narration that adopts a character's thoughts or language without a reporting phrase	Free indirect discourse lets the narration echo Lian's irritation without writing “she thought.”

Time and Voice in Fiction

Reading practice for pages 4–6. Five relevant words are highlighted.

English reading

A novelist alternates scene summary with vivid dialogue to control pace. A recurring motif of stopped clocks signals each temporal shift. Through free indirect discourse, the narration briefly adopts a character’s private vocabulary without quotation marks. Even litotes—calling a disastrous meeting “not ideal”—reveals how that character hides fear behind understatement.

Reading comprehension

1. What signals each temporal shift?

A recurring motif of stopped clocks signals it.

2. What does free indirect discourse reveal?

It reveals a character's private language within the narration.

3. How does litotes characterize the speaker?

The understatement shows the character hiding fear.

Cloze vocabulary quiz

1. The migrating birds become a ___ connected to freedom.

Answer: recurring motif

2. A ___ covers the uneventful months between the two expeditions.

Answer: scene summary

3. Calling the championship victory “not a small achievement” uses ___.

Answer: litotes

4. ___ lets the narration echo Lian's irritation without writing “she thought.”

Answer: free indirect discourse

5. The phrase “years earlier” signals a ___ into the character's childhood.

Answer: temporal shift

Page 5: words 141–175

Vocabulary page 5
#	Word	Details	Meaning	Sample sentence
141	volta	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Base-form focus: volta is the dictionary headword; compare its inflected or derived forms in context.	a turn in a poem's thought, argument, or emotional direction	The sonnet's volta shifts from grieving the past to welcoming change.
142	slant rhyme	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Term structure: slant + rhyme. Study the complete expression as one field-specific unit.	rhyme in which the ending sounds are similar but not identical	The poet pairs shape and keep as a slant rhyme.
143	internal rhyme	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Term structure: internal + rhyme. Study the complete expression as one field-specific unit.	rhyme between words within a single line or across the middle of nearby lines	“The light in flight crossed the bay” uses internal rhyme.
144	end rhyme	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Term structure: end + rhyme. Study the complete expression as one field-specific unit.	rhyme created by words at the ends of poetic lines	The stanza's end rhyme links shore with more.
145	heroic couplet	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Term structure: heroic + couplet. Study the complete expression as one field-specific unit.	two rhyming lines of iambic pentameter that form a complete thought	The satire closes its argument with a pointed heroic couplet.
146	terza rima	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Term structure: terza + rima. Study the complete expression as one field-specific unit.	a verse form using interlocking three-line rhyme groups	In terza rima, the middle rhyme of one stanza returns in the next.
147	villanelle	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Base-form focus: villanelle is the dictionary headword; compare its inflected or derived forms in context.	a nineteen-line poem whose two repeating lines alternate and meet at the end	The villanelle turns its repeated warning into an increasingly urgent plea.
148	sestina	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Base-form focus: sestina is the dictionary headword; compare its inflected or derived forms in context.	a thirty-nine-line poem that repeats six end words in a prescribed changing order	The sestina gives the word home a different significance in each stanza.
149	repeated line	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Term structure: repeated + line. Study the complete expression as one field-specific unit.	a complete poetic line that returns to create emphasis, structure, or change	Each appearance of the repeated line sounds less hopeful than the one before it.
150	poetic speaker	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Term structure: poetic + speaker. Study the complete expression as one field-specific unit.	the voice that speaks within a poem, distinct from the author	The poetic speaker addresses the sea as if it could answer.
151	accentual meter	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Term structure: accentual + meter. Study the complete expression as one field-specific unit.	poetic rhythm organized by a regular number of stressed syllables per line	The chant uses accentual meter with four strong beats in each line.
152	syllabic meter	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Term structure: syllabic + meter. Study the complete expression as one field-specific unit.	poetic rhythm organized by a fixed number of syllables per line	The poem's syllabic meter gives every line exactly eight syllables.
153	metrical variation	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Term structure: metrical + variation. Study the complete expression as one field-specific unit.	a deliberate change from an established rhythmic pattern	A sudden extra stress creates metrical variation at the moment of conflict.
154	sprung rhythm	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Term structure: sprung + rhythm. Study the complete expression as one field-specific unit.	a poetic rhythm that counts stressed syllables while allowing a varying number of unstressed syllables	Sprung rhythm gives the nature poem an energetic, uneven movement.
155	sound symbolism	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Term structure: sound + symbolism. Study the complete expression as one field-specific unit.	the use of speech sounds that suggest an impression or quality beyond literal meaning	Soft consonants create sound symbolism associated with calm water.
156	euphonic phrasing	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Term structure: euphonic + phrasing. Study the complete expression as one field-specific unit.	a smooth and pleasing arrangement of speech sounds	Long vowels give the lullaby its euphonic phrasing.
157	consonant patterning	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Term structure: consonant + patterning. Study the complete expression as one field-specific unit.	the deliberate recurrence or arrangement of consonant sounds	Hard k sounds create consonant patterning that sharpens the argument.
158	visual poetry	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Term structure: visual + poetry. Study the complete expression as one field-specific unit.	poetry in which the placement or shape of words contributes to meaning	The visual poetry arranges words like leaves falling down the page.
159	prose poem	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Term structure: prose + poem. Study the complete expression as one field-specific unit.	a poem written in paragraph form without regular line breaks	The prose poem uses dense imagery and rhythm within one compact paragraph.
160	dramatic verse	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Term structure: dramatic + verse. Study the complete expression as one field-specific unit.	poetry written for performance by speakers or characters	The play's dramatic verse becomes more formal when the king enters.
161	satirical voice	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Term structure: satirical + voice. Study the complete expression as one field-specific unit.	a speaking style that exposes folly or wrongdoing through irony, exaggeration, or ridicule	The essay's satirical voice praises wastefulness so extravagantly that the criticism is clear.
162	novella	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Base-form focus: novella is the dictionary headword; compare its inflected or derived forms in context.	a work of fiction longer than a short story but shorter than most novels	The novella follows one decisive week in the doctor's life.
163	picaresque	adjective Study Field: Grade 9 literature, rhetoric, and language term Word study: Base-form focus: picaresque is the dictionary headword; compare its inflected or derived forms in context.	describing an episodic story about a clever outsider surviving through wit	The picaresque novel sends its wandering hero through a series of comic misadventures.
164	gothic fiction	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Term structure: gothic + fiction. Study the complete expression as one field-specific unit.	fiction that combines fear, mystery, and threatening settings or histories	The ruined mansion and buried secret identify the novel as gothic fiction.
165	social realism	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Term structure: social + realism. Study the complete expression as one field-specific unit.	a style that depicts ordinary lives while examining social inequality or hardship	The film uses social realism to portray unsafe factory work.
166	naturalism	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Suffix focus: -ism often names a belief, system, movement, or practice.	a literary movement that emphasizes how environment, heredity, and social forces shape people	In naturalism, poverty and harsh surroundings sharply limit the protagonist's choices.
167	romanticism	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Suffix focus: -ism often names a belief, system, movement, or practice.	a movement emphasizing imagination, emotion, individual experience, and the power of nature	Romanticism appears in the poem's awe before a violent mountain storm.
168	modernism	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Suffix focus: -ism often names a belief, system, movement, or practice.	a movement that experiments with form and reflects the disruptions of modern life	Fragmented narration is one feature of the novel's modernism.
169	postmodernism	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Suffix focus: -ism often names a belief, system, movement, or practice.	an approach that questions stable truth and often mixes styles, voices, or self-conscious fiction	The story's postmodernism appears when the narrator argues with the character she created.
170	absurdism	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Suffix focus: -ism often names a belief, system, movement, or practice.	a movement portraying the conflict between the human search for meaning and an irrational world	The play's circular conversation expresses absurdism.
171	historical context	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Term structure: historical + context. Study the complete expression as one field-specific unit.	the events, beliefs, and conditions surrounding a work's time period	Historical context explains why the character risks punishment for publishing her opinion.
172	cultural context	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Term structure: cultural + context. Study the complete expression as one field-specific unit.	the shared customs, values, and symbols that shape a work or action	Understanding the gift's cultural context prevents readers from misinterpreting it as a bribe.
173	social context	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Term structure: social + context. Study the complete expression as one field-specific unit.	the relationships, institutions, and group expectations surrounding an event or text	The novel's social context makes the forbidden friendship especially dangerous.
174	biographical context	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Term structure: biographical + context. Study the complete expression as one field-specific unit.	relevant circumstances from an author's life that may inform interpretation	Biographical context connects the poem's island imagery with the author's childhood.
175	authorial intent	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Term structure: authorial + intent. Study the complete expression as one field-specific unit.	the purpose or effect an author may have meant to achieve	Readers can discuss authorial intent, but they must still support claims with the text.

Page 5 vocabulary review

Review five selected words from page 5.

Cloze vocabulary quiz

1. The poem's ___ gives every line exactly eight syllables.

Answer: syllabic meter

2. The film uses ___ to portray unsafe factory work.

Answer: social realism

3. A sudden extra stress creates ___ at the moment of conflict.

Answer: metrical variation

4. In ___, poverty and harsh surroundings sharply limit the protagonist's choices.

Answer: naturalism

5. The sonnet's ___ shifts from grieving the past to welcoming change.

Answer: volta

Page 6: words 176–210

Vocabulary page 6
#	Word	Details	Meaning	Sample sentence
176	reader response	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Term structure: reader + response. Study the complete expression as one field-specific unit.	an interpretation that considers how a reader's experience shapes meaning	Her reader response focuses on how migration in her family changes her view of the ending.
177	interpretive lens	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Term structure: interpretive + lens. Study the complete expression as one field-specific unit.	a particular set of questions or assumptions used to analyze a text	Through an environmental interpretive lens, the forest becomes more than a setting.
178	textual ambiguity	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Term structure: textual + ambiguity. Study the complete expression as one field-specific unit.	openness to more than one reasonable interpretation within a text	The final unanswered question preserves textual ambiguity.
179	thematic statement	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Term structure: thematic + statement. Study the complete expression as one field-specific unit.	a complete claim about what a work suggests regarding a central idea	“Fear can protect people but also imprison them” is a thematic statement.
180	central tension	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Term structure: central + tension. Study the complete expression as one field-specific unit.	the main opposition of needs, values, or forces that drives a work	The central tension pits personal loyalty against public duty.
181	collocation	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Suffix focus: -ation commonly forms a noun naming an action, process, or result.	a combination of words that commonly occur together	“Strong evidence” is a natural collocation, while “powerful evidence” is less typical.
182	lexical field	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Term structure: lexical + field. Study the complete expression as one field-specific unit.	a group of words connected by a shared subject or area of experience	Wave, anchor, and harbor belong to a maritime lexical field.
183	semantic field	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Term structure: semantic + field. Study the complete expression as one field-specific unit.	a set of words whose meanings relate within a conceptual area	Joy, grief, anger, and fear form a semantic field of emotion.
184	pragmatic meaning	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Term structure: pragmatic + meaning. Study the complete expression as one field-specific unit.	meaning inferred from context, intention, and social situation rather than words alone	The pragmatic meaning of “It is cold here” may be a request to close the window.
185	neologism	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Suffix focus: -ism often names a belief, system, movement, or practice.	a newly created word or a new sense of an existing word	The technology article introduces a neologism for anxiety caused by lost internet access.
186	archaism	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Suffix focus: -ism often names a belief, system, movement, or practice.	a word or expression no longer common in ordinary modern use	The historical drama uses the archaism “wherefore” to suggest an earlier period.
187	dysphemism	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Suffix focus: -ism often names a belief, system, movement, or practice.	a deliberately harsh or insulting expression used in place of a neutral one	Calling an old car a “rust bucket” is a dysphemism.
188	malapropism	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Suffix focus: -ism often names a belief, system, movement, or practice.	the humorous mistaken use of a word that sounds similar to the intended one	Saying “dance a flamingo” instead of “dance a flamenco” is a malapropism.
189	code-switching	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Term structure: code + switching. Study the complete expression as one field-specific unit.	shifting between languages or language varieties according to audience or situation	His code-switching becomes more formal during the job interview.
190	sociolect	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Base-form focus: sociolect is the dictionary headword; compare its inflected or derived forms in context.	a language variety associated with a particular social group	The researcher studies a workplace sociolect used by experienced sailors.
191	idiolect	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Base-form focus: idiolect is the dictionary headword; compare its inflected or derived forms in context.	the distinctive language habits of one individual	The novelist gives each character an idiolect through favorite phrases and sentence patterns.
192	descriptivism	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Suffix focus: -ism often names a belief, system, movement, or practice.	the approach of studying how people actually use language without first judging it	Descriptivism treats new slang as evidence of language change.
193	prescriptivism	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Suffix focus: -ism often names a belief, system, movement, or practice.	the approach of promoting rules for how language should be used	Prescriptivism favors standard forms in formal writing.
194	nominalization	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Suffix focus: -ization forms a noun for a process of making or becoming.	the formation or use of a noun from another part of speech	The nominalization decision can replace the more direct verb decide.
195	active voice	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Term structure: active + voice. Study the complete expression as one field-specific unit.	a grammatical construction in which the subject performs the verb's action	“The committee approved the plan” uses active voice.
196	passive voice	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Term structure: passive + voice. Study the complete expression as one field-specific unit.	a grammatical construction in which the subject receives the verb's action	“The plan was approved” uses passive voice.
197	periodic sentence	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Term structure: periodic + sentence. Study the complete expression as one field-specific unit.	a sentence that delays its main clause until the end	“After months of debate and two revisions, the council agreed” is a periodic sentence.
198	cumulative sentence	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Term structure: cumulative + sentence. Study the complete expression as one field-specific unit.	a sentence that begins with a complete main clause and then adds modifying details	“The hawk rose, circling above the field, watching the grass” is a cumulative sentence.
199	balanced sentence	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Term structure: balanced + sentence. Study the complete expression as one field-specific unit.	a sentence with parallel parts of similar length and importance	“The law promised order; the protest demanded justice” is a balanced sentence.
200	rhetorical fragment	noun Study Field: Grade 9 literature, rhetoric, and language term Word study: Term structure: rhetorical + fragment. Study the complete expression as one field-specific unit.	an intentional incomplete sentence used for emphasis or effect	After describing the damage, the writer adds the rhetorical fragment “Too late.”
201	cell wall	noun Study Field: Grade 9 life-science and ecology term Word study: Term structure: cell + wall. Study the complete expression as one field-specific unit.	a rigid outer layer that supports and protects certain cells	The plant's cell wall helps it keep a stable shape.
202	central vacuole	noun Study Field: Grade 9 life-science and ecology term Word study: Term structure: central + vacuole. Study the complete expression as one field-specific unit.	a large storage compartment in many plant cells that also helps maintain pressure	Water entering the central vacuole makes the plant cell firm.
203	lysosome	noun Study Field: Grade 9 life-science and ecology term Word study: Base-form focus: lysosome is the dictionary headword; compare its inflected or derived forms in context.	a cell structure containing enzymes that break down waste and worn-out parts	A lysosome digests damaged material so its components can be reused.
204	Golgi apparatus	noun Study Field: Grade 9 life-science and ecology term Word study: Term structure: Golgi + apparatus. Study the complete expression as one field-specific unit.	a cell structure that modifies, sorts, and packages proteins and lipids	The Golgi apparatus places finished proteins into vesicles for transport.
205	endoplasmic reticulum	noun Study Field: Grade 9 life-science and ecology term Word study: Term structure: endoplasmic + reticulum. Study the complete expression as one field-specific unit.	a membrane network that helps make and transport proteins or lipids within a cell	Ribosomes attached to rough endoplasmic reticulum assemble proteins.
206	cytoskeleton	noun Study Field: Grade 9 life-science and ecology term Word study: Base-form focus: cytoskeleton is the dictionary headword; compare its inflected or derived forms in context.	a network of protein fibers that gives a cell shape, organization, and movement	The cytoskeleton helps a white blood cell change shape as it moves.
207	vesicle	noun Study Field: Grade 9 life-science and ecology term Word study: Base-form focus: vesicle is the dictionary headword; compare its inflected or derived forms in context.	a small membrane-bound sac that stores or transports material in a cell	A vesicle carries the protein toward the cell membrane.
208	cell specialization	noun Study Field: Grade 9 life-science and ecology term Word study: Term structure: cell + specialization. Study the complete expression as one field-specific unit.	the process by which cells develop structures suited to particular functions	Cell specialization produces neurons that transmit signals and muscle cells that contract.
209	unicellular	adjective Study Field: Grade 9 life-science and ecology term Word study: Base-form focus: unicellular is the dictionary headword; compare its inflected or derived forms in context.	consisting of one cell	A unicellular organism must perform all life processes within its single cell.
210	multicellular	adjective Study Field: Grade 9 life-science and ecology term Word study: Prefix focus: multi- means many.	consisting of many cells that may have specialized roles	A tree is multicellular and contains tissues for transport, support, and growth.

Page 6 vocabulary review

Review five selected words from page 6.

Cloze vocabulary quiz

1. Through an environmental ___, the forest becomes more than a setting.

Answer: interpretive lens

2. The researcher studies a workplace ___ used by experienced sailors.

Answer: sociolect

3. A ___ digests damaged material so its components can be reused.

Answer: lysosome

4. The final unanswered question preserves ___.

Answer: textual ambiguity

5. The novelist gives each character an ___ through favorite phrases and sentence patterns.

Answer: idiolect

Page 7: words 211–245

Vocabulary page 7
#	Word	Details	Meaning	Sample sentence
211	prokaryote	noun Study Field: Grade 9 life-science and ecology term Word study: Base-form focus: prokaryote is the dictionary headword; compare its inflected or derived forms in context.	an organism whose cell lacks a nucleus and other membrane-bound organelles	A bacterium is a prokaryote with DNA located in its cell interior.
212	eukaryote	noun Study Field: Grade 9 life-science and ecology term Word study: Base-form focus: eukaryote is the dictionary headword; compare its inflected or derived forms in context.	an organism whose cells contain a nucleus and membrane-bound organelles	A mushroom is a eukaryote because its cells enclose DNA inside nuclei.
213	facilitated diffusion	noun Study Field: Grade 9 life-science and ecology term Word study: Term structure: facilitated + diffusion. Study the complete expression as one field-specific unit.	passive movement across a membrane through a transport protein	Glucose can enter some cells by facilitated diffusion.
214	osmosis	noun Study Field: Grade 9 life-science and ecology term Word study: Base-form focus: osmosis is the dictionary headword; compare its inflected or derived forms in context.	the movement of water across a selectively permeable membrane toward greater solute concentration	Through osmosis, water entered the cell from the dilute solution.
215	active transport	noun Study Field: Grade 9 life-science and ecology term Word study: Term structure: active + transport. Study the complete expression as one field-specific unit.	movement across a cell membrane that requires energy, often against a concentration difference	The sodium-potassium pump uses active transport.
216	passive transport	noun Study Field: Grade 9 life-science and ecology term Word study: Term structure: passive + transport. Study the complete expression as one field-specific unit.	movement across a cell membrane without the cell spending energy	Simple diffusion is a form of passive transport.
217	concentration gradient	noun Study Field: Grade 9 life-science and ecology term Word study: Term structure: concentration + gradient. Study the complete expression as one field-specific unit.	a difference in the amount of a substance across a distance or membrane	Oxygen moves down its concentration gradient into the cell.
218	selectively permeable	adjective Study Field: Grade 9 life-science and ecology term Word study: Term structure: selectively + permeable. Study the complete expression as one field-specific unit.	allowing some substances to cross while blocking others	The cell membrane is selectively permeable.
219	enzyme specificity	noun Study Field: Grade 9 life-science and ecology term Word study: Term structure: enzyme + specificity. Study the complete expression as one field-specific unit.	the tendency of an enzyme to act only on a particular substrate or small group of substrates	Enzyme specificity allows lactase to act on lactose rather than every sugar.
220	substrate	noun Study Field: Grade 9 life-science and ecology term Word study: Base-form focus: substrate is the dictionary headword; compare its inflected or derived forms in context.	the substance on which an enzyme acts	The substrate fits into the enzyme's active site.
221	activation energy	noun Study Field: Grade 9 life-science and ecology term Word study: Term structure: activation + energy. Study the complete expression as one field-specific unit.	the minimum energy needed to begin a chemical reaction	An enzyme lowers the activation energy of a cellular reaction.
222	cellular respiration	noun Study Field: Grade 9 life-science and ecology term Word study: Term structure: cellular + respiration. Study the complete expression as one field-specific unit.	the process by which cells release usable energy from food molecules	During cellular respiration, cells transfer energy from glucose into ATP.
223	light-dependent reaction	noun Study Field: Grade 9 life-science and ecology term Word study: Term structure: light + dependent + reaction. Study the complete expression as one field-specific unit.	the stage of photosynthesis that captures light energy and splits water	The light-dependent reaction occurs in the thylakoid membranes.
224	glycolysis	noun Study Field: Grade 9 life-science and ecology term Word study: Base-form focus: glycolysis is the dictionary headword; compare its inflected or derived forms in context.	the first stage of glucose breakdown, occurring in the cell's cytoplasm	Glycolysis splits one glucose molecule into smaller molecules.
225	fermentation	noun Study Field: Grade 9 life-science and ecology term Word study: Suffix focus: -ation commonly forms a noun naming an action, process, or result.	an energy-releasing process that allows glycolysis to continue without oxygen	Yeast uses fermentation to produce carbon dioxide in bread dough.
226	aerobic	adjective Study Field: Grade 9 life-science and ecology term Word study: Base-form focus: aerobic is the dictionary headword; compare its inflected or derived forms in context.	requiring or occurring in the presence of oxygen	Aerobic respiration releases more usable energy than fermentation.
227	anaerobic	adjective Study Field: Grade 9 life-science and ecology term Word study: Base-form focus: anaerobic is the dictionary headword; compare its inflected or derived forms in context.	occurring without oxygen	Some microorganisms carry out anaerobic metabolism in deep mud.
228	ATP	noun Study Field: Grade 9 life-science and ecology term Word study: Capitalization focus: ATP is an abbreviation or initialism; preserve its capital letters.	a molecule that transfers immediately usable energy within cells	Muscle contraction uses energy released when ATP loses a phosphate group.
229	metabolic regulation	noun Study Field: Grade 9 life-science and ecology term Word study: Term structure: metabolic + regulation. Study the complete expression as one field-specific unit.	control of the chemical pathways that sustain an organism	Metabolic regulation slows a pathway when enough of its product has accumulated.
230	metabolic pathway	noun Study Field: Grade 9 life-science and ecology term Word study: Term structure: metabolic + pathway. Study the complete expression as one field-specific unit.	a linked series of chemical reactions in a cell	Each step of a metabolic pathway is usually controlled by a particular enzyme.
231	amino acid	noun Study Field: Grade 9 life-science and ecology term Word study: Term structure: amino + acid. Study the complete expression as one field-specific unit.	a small organic molecule that serves as a building block of proteins	The order of each amino acid determines how a protein folds.
232	nucleotide	noun Study Field: Grade 9 life-science and ecology term Word study: Base-form focus: nucleotide is the dictionary headword; compare its inflected or derived forms in context.	the basic building block of DNA and RNA, containing a sugar, phosphate, and nitrogenous base	A nucleotide in DNA may contain the base adenine.
233	nucleic acid	noun Study Field: Grade 9 life-science and ecology term Word study: Term structure: nucleic + acid. Study the complete expression as one field-specific unit.	a DNA or RNA molecule that stores or helps express genetic information	DNA is a nucleic acid made of two nucleotide strands.
234	carbohydrate	noun Study Field: Grade 9 life-science and ecology term Word study: Base-form focus: carbohydrate is the dictionary headword; compare its inflected or derived forms in context.	an organic molecule of sugars that can provide energy or structural material	A potato stores carbohydrate mainly as starch.
235	lipid	noun Study Field: Grade 9 life-science and ecology term Word study: Base-form focus: lipid is the dictionary headword; compare its inflected or derived forms in context.	a water-insoluble organic molecule such as a fat, oil, wax, or steroid	A phospholipid is a lipid found in cell membranes.
236	phospholipid	noun Study Field: Grade 9 life-science and ecology term Word study: Base-form focus: phospholipid is the dictionary headword; compare its inflected or derived forms in context.	a lipid with a water-attracting head and water-repelling tails	Phospholipid molecules form a double layer around the cell.
237	macromolecule	noun Study Field: Grade 9 life-science and ecology term Word study: Prefix focus: macro- means large-scale.	a very large biological molecule built from smaller units	A protein is a macromolecule made from amino acids.
238	polymer	noun Study Field: Grade 9 life-science and ecology term Word study: Base-form focus: polymer is the dictionary headword; compare its inflected or derived forms in context.	a large molecule formed from many repeating or related smaller units	Starch is a polymer composed of glucose units.
239	monomer	noun Study Field: Grade 9 life-science and ecology term Word study: Base-form focus: monomer is the dictionary headword; compare its inflected or derived forms in context.	a small molecular unit that can join with others to form a polymer	A nucleotide acts as a monomer in a nucleic acid.
240	protein folding	noun Study Field: Grade 9 life-science and ecology term Word study: Term structure: protein + folding. Study the complete expression as one field-specific unit.	the process by which a protein chain takes on its functional three-dimensional shape	A temperature change can disrupt protein folding.
241	chromosome duplication	noun Study Field: Grade 9 life-science and ecology term Word study: Term structure: chromosome + duplication. Study the complete expression as one field-specific unit.	the copying of a chromosome's DNA before cell division	Chromosome duplication produces two sister chromatids.
242	chromatid	noun Study Field: Grade 9 life-science and ecology term Word study: Base-form focus: chromatid is the dictionary headword; compare its inflected or derived forms in context.	one of two identical DNA copies joined after a chromosome is duplicated	Each chromatid separates during mitosis.
243	centromere	noun Study Field: Grade 9 life-science and ecology term Word study: Base-form focus: centromere is the dictionary headword; compare its inflected or derived forms in context.	the chromosome region that joins sister chromatids and attaches to division machinery	Spindle fibers connect near the centromere.
244	homologous pair	noun Study Field: Grade 9 life-science and ecology term Word study: Term structure: homologous + pair. Study the complete expression as one field-specific unit.	two chromosomes carrying the same kinds of genes, one inherited from each parent	A homologous pair may contain different alleles of a gene.
245	gamete	noun Study Field: Grade 9 life-science and ecology term Word study: Base-form focus: gamete is the dictionary headword; compare its inflected or derived forms in context.	a reproductive cell containing one set of chromosomes	A human gamete has twenty-three chromosomes.

Energy and Cell Division

Reading practice for pages 7–9. Five relevant words are highlighted.

English reading

Before a cell divides, chromosome duplication preserves genetic instructions for both new cells. ATP supplies energy for active transport, which moves substances against a concentration gradient. Passive transport requires no direct energy input. Meanwhile, correct protein folding allows many cell structures and enzymes to function as their shapes require.

Reading comprehension

1. Why does chromosome duplication occur?

It preserves genetic instructions for both new cells.

2. Which process uses ATP?

Active transport uses ATP.

3. Why is protein folding important?

A protein's shape enables its function.

Cloze vocabulary quiz

1. A temperature change can disrupt ___.

Answer: protein folding

2. The sodium-potassium pump uses ___.

Answer: active transport

3. Muscle contraction uses energy released when ___ loses a phosphate group.

Answer: ATP

4. ___ produces two sister chromatids.

Answer: chromosome duplication

5. Simple diffusion is a form of ___.

Answer: passive transport

Page 8: words 246–280

Vocabulary page 8
#	Word	Details	Meaning	Sample sentence
246	zygote	noun Study Field: Grade 9 life-science and ecology term Word study: Base-form focus: zygote is the dictionary headword; compare its inflected or derived forms in context.	the first cell formed when two gametes join	The zygote begins dividing soon after fertilization.
247	fertilization	noun Study Field: Grade 9 life-science and ecology term Word study: Suffix focus: -ization forms a noun for a process of making or becoming.	the joining of gametes to form a zygote	Fertilization combines genetic material from two parents.
248	hereditary pattern	noun Study Field: Grade 9 life-science and ecology term Word study: Term structure: hereditary + pattern. Study the complete expression as one field-specific unit.	a regular way in which a trait or condition passes between generations	The pedigree revealed a hereditary pattern linked to a recessive allele.
249	Punnett square	noun Study Field: Grade 9 life-science and ecology term Word study: Term structure: Punnett + square. Study the complete expression as one field-specific unit.	a grid used to predict possible allele combinations in offspring	The Punnett square shows a one-in-four chance of the recessive genotype.
250	Mendelian inheritance	noun Study Field: Grade 9 life-science and ecology term Word study: Term structure: Mendelian + inheritance. Study the complete expression as one field-specific unit.	inheritance patterns explained by the separation and combination of alleles	A single-gene dominant trait may follow Mendelian inheritance.
251	incomplete dominance	noun Study Field: Grade 9 life-science and ecology term Word study: Term structure: incomplete + dominance. Study the complete expression as one field-specific unit.	inheritance in which a heterozygote shows an intermediate phenotype	Red and white flowers produce pink offspring through incomplete dominance.
252	codominance	noun Study Field: Grade 9 life-science and ecology term Word study: Suffix focus: -ance commonly forms a noun naming an action, quality, or state.	inheritance in which both alleles are fully expressed in a heterozygote	Human AB blood type demonstrates codominance.
253	polygenic trait	noun Study Field: Grade 9 life-science and ecology term Word study: Term structure: polygenic + trait. Study the complete expression as one field-specific unit.	a characteristic influenced by several genes	Human height is a polygenic trait also affected by environment.
254	sex chromosome	noun Study Field: Grade 9 life-science and ecology term Word study: Term structure: sex + chromosome. Study the complete expression as one field-specific unit.	a chromosome involved in determining biological sex and carrying sex-linked genes	The X chromosome is a human sex chromosome.
255	autosome	noun Study Field: Grade 9 life-science and ecology term Word study: Base-form focus: autosome is the dictionary headword; compare its inflected or derived forms in context.	a chromosome that is not a sex chromosome	Humans normally have twenty-two pairs of each autosome type.
256	genetic variation	noun Study Field: Grade 9 life-science and ecology term Word study: Term structure: genetic + variation. Study the complete expression as one field-specific unit.	differences in DNA or inherited traits among individuals	Genetic variation gives natural selection material on which to act.
257	genetic disorder	noun Study Field: Grade 9 life-science and ecology term Word study: Term structure: genetic + disorder. Study the complete expression as one field-specific unit.	a health condition caused partly or wholly by changes in genes or chromosomes	A genetic disorder may result from one altered gene or an extra chromosome.
258	genetic carrier	noun Study Field: Grade 9 life-science and ecology term Word study: Term structure: genetic + carrier. Study the complete expression as one field-specific unit.	an individual who has a recessive allele without showing the associated trait	A genetic carrier can pass the recessive allele to a child.
259	gene expression	noun Study Field: Grade 9 life-science and ecology term Word study: Term structure: gene + expression. Study the complete expression as one field-specific unit.	the process by which information in a gene produces a functional product	Environmental signals can change gene expression without altering the DNA sequence.
260	gene regulation	noun Study Field: Grade 9 life-science and ecology term Word study: Term structure: gene + regulation. Study the complete expression as one field-specific unit.	control over when, where, and how strongly a gene is expressed	Gene regulation allows liver cells and nerve cells to use different sets of genes.
261	biotechnology	noun Study Field: Grade 9 life-science and ecology term Word study: Root and suffix focus: -logy means the study of a subject.	the use of living systems or biological processes to develop products and solutions	Biotechnology enables microbes to produce human insulin.
262	genetic engineering	noun Study Field: Grade 9 life-science and ecology term Word study: Term structure: genetic + engineering. Study the complete expression as one field-specific unit.	the deliberate modification of an organism's DNA using laboratory methods	Genetic engineering added a disease-resistance gene to the plant.
263	cloning	noun Study Field: Grade 9 life-science and ecology term Word study: Base-form focus: cloning is the dictionary headword; compare its inflected or derived forms in context.	the production of genetically identical DNA, cells, or organisms	Researchers use cloning to create many copies of a useful gene.
264	stem cell	noun Study Field: Grade 9 life-science and ecology term Word study: Term structure: stem + cell. Study the complete expression as one field-specific unit.	an unspecialized cell capable of dividing and developing into other cell types	A stem cell can produce several kinds of blood cell.
265	gene therapy	noun Study Field: Grade 9 life-science and ecology term Word study: Term structure: gene + therapy. Study the complete expression as one field-specific unit.	treatment that adds, removes, or alters genetic material in a patient's cells	Gene therapy supplied working copies of a missing gene.
266	selective breeding	noun Study Field: Grade 9 life-science and ecology term Word study: Term structure: selective + breeding. Study the complete expression as one field-specific unit.	human-directed reproduction of organisms chosen for desired traits	Farmers used selective breeding to develop wheat with shorter stems.
267	selective pressure	noun Study Field: Grade 9 life-science and ecology term Word study: Term structure: selective + pressure. Study the complete expression as one field-specific unit.	an environmental factor that changes which traits improve survival or reproduction	Antibiotic use creates selective pressure favoring resistant bacteria.
268	common ancestor	noun Study Field: Grade 9 life-science and ecology term Word study: Term structure: common + ancestor. Study the complete expression as one field-specific unit.	an ancestral population or species shared by two or more later groups	Humans and chimpanzees share a common ancestor.
269	homologous structure	noun Study Field: Grade 9 life-science and ecology term Word study: Term structure: homologous + structure. Study the complete expression as one field-specific unit.	a body part similar in underlying anatomy because of shared ancestry	A whale flipper and a human arm are a homologous structure in evolutionary comparison.
270	analogous structure	noun Study Field: Grade 9 life-science and ecology term Word study: Term structure: analogous + structure. Study the complete expression as one field-specific unit.	a body part with a similar function but a different evolutionary origin	A bird wing and an insect wing are an analogous structure.
271	vestigial structure	noun Study Field: Grade 9 life-science and ecology term Word study: Term structure: vestigial + structure. Study the complete expression as one field-specific unit.	an inherited feature reduced from a more functional form in ancestors	A whale's small pelvic bone is a vestigial structure.
272	fossil record	noun Study Field: Grade 9 life-science and ecology term Word study: Term structure: fossil + record. Study the complete expression as one field-specific unit.	the collection and chronological placement of fossils found in Earth's rocks	The fossil record documents major changes in horse ancestors.
273	geographic isolation	noun Study Field: Grade 9 life-science and ecology term Word study: Term structure: geographic + isolation. Study the complete expression as one field-specific unit.	physical separation that prevents populations from interbreeding	A new river caused geographic isolation between two lizard populations.
274	reproductive isolation	noun Study Field: Grade 9 life-science and ecology term Word study: Term structure: reproductive + isolation. Study the complete expression as one field-specific unit.	a biological barrier that prevents populations from producing fertile offspring together	Different mating seasons can create reproductive isolation.
275	genetic drift	noun Study Field: Grade 9 life-science and ecology term Word study: Term structure: genetic + drift. Study the complete expression as one field-specific unit.	random change in allele frequencies, especially in small populations	A storm that kills organisms by chance can cause genetic drift.
276	gene flow	noun Study Field: Grade 9 life-science and ecology term Word study: Term structure: gene + flow. Study the complete expression as one field-specific unit.	the movement of alleles between populations through migration and reproduction	Windblown pollen creates gene flow between distant plant populations.
277	bottleneck effect	noun Study Field: Grade 9 life-science and ecology term Word study: Term structure: bottleneck + effect. Study the complete expression as one field-specific unit.	loss of genetic variation after a population is sharply reduced	A severe wildfire produced a bottleneck effect in the isolated rabbit population.
278	founder effect	noun Study Field: Grade 9 life-science and ecology term Word study: Term structure: founder + effect. Study the complete expression as one field-specific unit.	reduced genetic variation when a new population begins with few individuals	The island colony shows a founder effect because it began with three birds.
279	extinction rate	noun Study Field: Grade 9 life-science and ecology term Word study: Term structure: extinction + rate. Study the complete expression as one field-specific unit.	the frequency at which species disappear during a stated period	Habitat destruction can raise the extinction rate.
280	mass extinction	noun Study Field: Grade 9 life-science and ecology term Word study: Term structure: mass + extinction. Study the complete expression as one field-specific unit.	a geologically brief interval in which a large share of species disappears	The end-Permian mass extinction eliminated most marine species.

Page 8 vocabulary review

Review five selected words from page 8.

Cloze vocabulary quiz

1. The island colony shows a ___ because it began with three birds.

Answer: founder effect

2. Human height is a ___ also affected by environment.

Answer: polygenic trait

3. Farmers used ___ to develop wheat with shorter stems.

Answer: selective breeding

4. Habitat destruction can raise the ___.

Answer: extinction rate

5. The X chromosome is a human ___.

Answer: sex chromosome

Page 9: words 281–315

Vocabulary page 9
#	Word	Details	Meaning	Sample sentence
281	adaptive radiation	noun Study Field: Grade 9 life-science and ecology term Word study: Term structure: adaptive + radiation. Study the complete expression as one field-specific unit.	rapid diversification of one ancestral group into species adapted to different roles	Island finches underwent adaptive radiation as they used different foods.
282	population dispersion	noun Study Field: Grade 9 life-science and ecology term Word study: Term structure: population + dispersion. Study the complete expression as one field-specific unit.	the pattern by which individuals are spaced within an area	Nesting seabirds show clumped population dispersion along the cliffs.
283	environmental resistance	noun Study Field: Grade 9 life-science and ecology term Word study: Term structure: environmental + resistance. Study the complete expression as one field-specific unit.	the combined limiting forces that prevent a population from growing indefinitely	Disease and food shortage contribute to environmental resistance.
284	limiting factor	noun Study Field: Grade 9 life-science and ecology term Word study: Term structure: limiting + factor. Study the complete expression as one field-specific unit.	a resource or condition that restricts population growth or distribution	Available nesting space is the limiting factor for the colony.
285	biotic factor	noun Study Field: Grade 9 life-science and ecology term Word study: Term structure: biotic + factor. Study the complete expression as one field-specific unit.	a living part of an ecosystem that influences other organisms	Competition with an invasive plant is a biotic factor.
286	abiotic factor	noun Study Field: Grade 9 life-science and ecology term Word study: Term structure: abiotic + factor. Study the complete expression as one field-specific unit.	a nonliving physical or chemical part of an ecosystem	Soil pH is an abiotic factor affecting which plants can grow.
287	predator-prey relationship	noun Study Field: Grade 9 life-science and ecology term Word study: Term structure: predator + prey + relationship. Study the complete expression as one field-specific unit.	an ecological interaction in which one organism hunts and consumes another	Changes in snowshoe hare numbers affect their predator-prey relationship with lynx.
288	trophic level	noun Study Field: Grade 9 life-science and ecology term Word study: Term structure: trophic + level. Study the complete expression as one field-specific unit.	a feeding position in the transfer of energy through an ecosystem	An herbivore occupies a lower trophic level than a hawk.
289	energy pyramid	noun Study Field: Grade 9 life-science and ecology term Word study: Term structure: energy + pyramid. Study the complete expression as one field-specific unit.	a diagram showing that usable energy decreases at higher feeding levels	The energy pyramid is widest at the producer level.
290	biomass	noun Study Field: Grade 9 life-science and ecology term Word study: Base-form focus: biomass is the dictionary headword; compare its inflected or derived forms in context.	the total mass of living material in a defined area or feeding level	The grassland contains more plant biomass than wolf biomass.
291	nutrient cycle	noun Study Field: Grade 9 life-science and ecology term Word study: Term structure: nutrient + cycle. Study the complete expression as one field-specific unit.	the repeated movement of a chemical nutrient through organisms and the environment	Decomposers return matter to the soil in a nutrient cycle.
292	nitrogen cycle	noun Study Field: Grade 9 life-science and ecology term Word study: Term structure: nitrogen + cycle. Study the complete expression as one field-specific unit.	the movement and transformation of nitrogen through air, soil, water, and organisms	Bacteria convert atmospheric nitrogen during the nitrogen cycle.
293	ecological niche	noun Study Field: Grade 9 life-science and ecology term Word study: Term structure: ecological + niche. Study the complete expression as one field-specific unit.	a species' role, resource use, and environmental requirements within an ecosystem	Two species with an identical ecological niche compete strongly.
294	habitat fragmentation	noun Study Field: Grade 9 life-science and ecology term Word study: Term structure: habitat + fragmentation. Study the complete expression as one field-specific unit.	the division of continuous habitat into smaller separated areas	A highway caused habitat fragmentation in the forest.
295	invasive species	noun Study Field: Grade 9 life-science and ecology term Word study: Term structure: invasive + species. Study the complete expression as one field-specific unit.	a nonnative organism that spreads and causes ecological, economic, or health harm	The invasive species crowded native mussels off the rocks.
296	keystone species	noun Study Field: Grade 9 life-science and ecology term Word study: Term structure: keystone + species. Study the complete expression as one field-specific unit.	a species whose ecological influence is unusually large compared with its abundance	Sea otters are a keystone species because they limit sea urchins that consume kelp.
297	conservation biology	noun Study Field: Grade 9 life-science and ecology term Word study: Term structure: conservation + biology. Study the complete expression as one field-specific unit.	the science of protecting biodiversity and managing threats to species and ecosystems	Conservation biology guides plans for reconnecting wildlife habitat.
298	restoration ecology	noun Study Field: Grade 9 life-science and ecology term Word study: Term structure: restoration + ecology. Study the complete expression as one field-specific unit.	the science and practice of repairing damaged ecosystems	Restoration ecology informed the replanting of native wetland grasses.
299	ecological resilience	noun Study Field: Grade 9 life-science and ecology term Word study: Term structure: ecological + resilience. Study the complete expression as one field-specific unit.	an ecosystem's capacity to withstand disturbance and recover its functions	Species diversity can strengthen ecological resilience after drought.
300	ecological succession	noun Study Field: Grade 9 life-science and ecology term Word study: Term structure: ecological + succession. Study the complete expression as one field-specific unit.	the gradual change in a biological community after disturbance or new habitat formation	Ecological succession began when lichens colonized the bare lava.
301	mole	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Base-form focus: mole is the dictionary headword; compare its inflected or derived forms in context.	the amount of a substance containing approximately 6.022 times 10 to the twenty-third particles	One mole of carbon atoms contains Avogadro's number of atoms.
302	molar mass	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: molar + mass. Study the complete expression as one field-specific unit.	the mass in grams of one mole of a substance	Water has a molar mass of about eighteen grams per mole.
303	empirical formula	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: empirical + formula. Study the complete expression as one field-specific unit.	a chemical formula showing the simplest whole-number ratio of elements in a compound	The empirical formula of hydrogen peroxide is HO.
304	molecular formula	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: molecular + formula. Study the complete expression as one field-specific unit.	a chemical formula showing the actual number of each kind of atom in a molecule	The molecular formula of hydrogen peroxide is H2O2.
305	stoichiometry	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Root and suffix focus: -metry relates to measuring.	the calculation of quantities in chemical reactions from balanced equations	Stoichiometry predicts how much oxygen is needed to burn the fuel completely.
306	chemical equation	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: chemical + equation. Study the complete expression as one field-specific unit.	a symbolic statement showing the reactants, products, and proportions in a reaction	The balanced chemical equation has the same number of each atom on both sides.
307	stoichiometric coefficient	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: stoichiometric + coefficient. Study the complete expression as one field-specific unit.	a number before a chemical formula that gives a reaction's particle or mole ratio	The stoichiometric coefficient 2 indicates two molecules of water.
308	reaction mixture	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: reaction + mixture. Study the complete expression as one field-specific unit.	the combined substances present while a chemical reaction occurs	The reaction mixture turned cloudy as a solid formed.
309	conservation of mass	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: conservation + of + mass. Study the complete expression as one field-specific unit.	the principle that matter is not created or destroyed in an ordinary chemical reaction	Conservation of mass requires the total reactant mass to equal the total product mass in a closed system.
310	limiting reactant	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: limiting + reactant. Study the complete expression as one field-specific unit.	the reactant consumed first, which determines the maximum amount of product	Hydrogen was the limiting reactant, so some oxygen remained.
311	excess reactant	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: excess + reactant. Study the complete expression as one field-specific unit.	a reactant present in more than the amount needed to complete a reaction	Oxygen was the excess reactant and remained after the hydrogen was consumed.
312	theoretical yield	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: theoretical + yield. Study the complete expression as one field-specific unit.	the greatest amount of product predicted from a balanced reaction	The calculation gave a theoretical yield of twelve grams.
313	actual yield	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: actual + yield. Study the complete expression as one field-specific unit.	the amount of product actually collected from a reaction	Some product was lost during filtering, so the actual yield was ten grams.
314	percent yield	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: percent + yield. Study the complete expression as one field-specific unit.	the actual yield divided by the theoretical yield and expressed as a percentage	The experiment's percent yield was eighty-three percent.
315	solubility	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Suffix focus: -ity commonly forms a noun naming a quality, state, or condition.	the maximum amount of a substance that dissolves under specified conditions	The solubility of many solids increases as water warms.

Page 9 vocabulary review

Review five selected words from page 9.

Cloze vocabulary quiz

1. Decomposers return matter to the soil in a ___.

Answer: nutrient cycle

2. The ___ of hydrogen peroxide is H2O2.

Answer: molecular formula

3. Bacteria convert atmospheric nitrogen during the ___.

Answer: nitrogen cycle

4. ___ predicts how much oxygen is needed to burn the fuel completely.

Answer: stoichiometry

5. Two species with an identical ___ compete strongly.

Answer: ecological niche

Page 10: words 316–350

Vocabulary page 10
#	Word	Details	Meaning	Sample sentence
316	solution concentration	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: solution + concentration. Study the complete expression as one field-specific unit.	the amount of dissolved substance in a given amount of solution	Evaporation increased the solution concentration.
317	molarity	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Suffix focus: -ity commonly forms a noun naming a quality, state, or condition.	solution concentration measured in moles of solute per liter of solution	The beaker contained a molarity of 0.5 moles per liter.
318	pH scale	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: pH + scale. Study the complete expression as one field-specific unit.	a numerical scale describing how acidic or basic an aqueous solution is	Pure water is near 7 on the pH scale.
319	acid-base indicator	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: acid + base + indicator. Study the complete expression as one field-specific unit.	a substance whose color changes over a range of acidity or basicity	Litmus is an acid-base indicator that turns red in acid.
320	electrolyte	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Base-form focus: electrolyte is the dictionary headword; compare its inflected or derived forms in context.	a substance that forms ions in solution and allows the solution to conduct electricity	Dissolved salt is an electrolyte.
321	nonelectrolyte	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Prefix focus: non- means not or without.	a substance that dissolves without forming enough ions to conduct electricity	Sugar is a nonelectrolyte in water.
322	oxidation number	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: oxidation + number. Study the complete expression as one field-specific unit.	a bookkeeping value representing an atom's apparent charge in a compound	Oxygen usually has an oxidation number of negative two.
323	redox reaction	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: redox + reaction. Study the complete expression as one field-specific unit.	a reaction involving electron transfer and changes in oxidation numbers	Rusting is a redox reaction in which iron loses electrons.
324	electron transfer	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: electron + transfer. Study the complete expression as one field-specific unit.	movement of one or more electrons from one atom or species to another	Electron transfer occurs from zinc to copper ions in the cell.
325	synthesis reaction	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: synthesis + reaction. Study the complete expression as one field-specific unit.	a chemical reaction in which simpler substances combine to form a more complex product	A synthesis reaction joins hydrogen and oxygen to form water.
326	decomposition reaction	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: decomposition + reaction. Study the complete expression as one field-specific unit.	a chemical reaction in which one compound breaks into simpler substances	Heating calcium carbonate causes a decomposition reaction.
327	single-replacement reaction	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: single + replacement + reaction. Study the complete expression as one field-specific unit.	a reaction in which one element replaces another element in a compound	Zinc replacing hydrogen in acid is a single-replacement reaction.
328	double-replacement reaction	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: double + replacement + reaction. Study the complete expression as one field-specific unit.	a reaction in which ions from two compounds exchange partners	The two clear solutions undergo a double-replacement reaction and form a solid.
329	precipitation reaction	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: precipitation + reaction. Study the complete expression as one field-specific unit.	a solution reaction that produces an insoluble solid	Mixing silver nitrate and sodium chloride causes a precipitation reaction.
330	net ionic equation	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: net + ionic + equation. Study the complete expression as one field-specific unit.	an equation showing only the particles that directly change during a solution reaction	The net ionic equation omits ions that remain unchanged.
331	scalar	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Base-form focus: scalar is the dictionary headword; compare its inflected or derived forms in context.	a quantity described by size alone without direction	Temperature is a scalar.
332	vector	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Base-form focus: vector is the dictionary headword; compare its inflected or derived forms in context.	a quantity described by both size and direction	Velocity is a vector because its direction matters.
333	vector magnitude	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: vector + magnitude. Study the complete expression as one field-specific unit.	the size or numerical length of a vector	The arrow's length represents the vector magnitude.
334	instantaneous velocity	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: instantaneous + velocity. Study the complete expression as one field-specific unit.	an object's speed and direction at one particular moment	The speedometer approximates the car's instantaneous velocity.
335	average acceleration	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: average + acceleration. Study the complete expression as one field-specific unit.	change in velocity divided by the time over which the change occurs	The runner's average acceleration was greatest during the first two seconds.
336	linear momentum	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: linear + momentum. Study the complete expression as one field-specific unit.	the product of an object's mass and velocity	A moving truck has more linear momentum than a bicycle at the same speed.
337	impulse	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Base-form focus: impulse is the dictionary headword; compare its inflected or derived forms in context.	force multiplied by the time it acts, equal to the resulting change in momentum	An air bag extends the stopping time and changes the passenger's momentum with a smaller impulse force.
338	rotational inertia	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: rotational + inertia. Study the complete expression as one field-specific unit.	an object's resistance to a change in its rotational motion	Moving mass farther from an axis increases rotational inertia.
339	force equilibrium	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: force + equilibrium. Study the complete expression as one field-specific unit.	a state in which forces balance and the net force is zero	A hanging lamp at rest is in force equilibrium.
340	frictional force	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: frictional + force. Study the complete expression as one field-specific unit.	a force resisting motion or attempted motion between touching surfaces	The frictional force between shoes and the floor prevents slipping.
341	gravitational force	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: gravitational + force. Study the complete expression as one field-specific unit.	the attractive force between objects with mass	Earth's gravitational force pulls the ball downward.
342	normal force	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: normal + force. Study the complete expression as one field-specific unit.	a support force exerted perpendicular to a contacting surface	The table's normal force balances the book's weight.
343	applied force	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: applied + force. Study the complete expression as one field-specific unit.	a push or pull exerted on an object by a person or another object	The worker's applied force moved the crate across the floor.
344	tension force	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: tension + force. Study the complete expression as one field-specific unit.	a pulling force transmitted through a taut rope, string, or cable	The cable's tension force supports the elevator.
345	free-body diagram	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: free + body + diagram. Study the complete expression as one field-specific unit.	a sketch showing all external forces acting on one chosen object	The free-body diagram includes gravity, support, and friction.
346	Newton's first law	proper noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: Newton's + first + law. Study the complete expression as one field-specific unit.	the law that motion remains unchanged unless a net external force acts	Newton's first law explains why a puck keeps sliding on nearly frictionless ice.
347	Newton's second law	proper noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: Newton's + second + law. Study the complete expression as one field-specific unit.	the law relating net force to mass and acceleration	Newton's second law predicts greater acceleration when the same mass receives a larger force.
348	Newton's third law	proper noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: Newton's + third + law. Study the complete expression as one field-specific unit.	the law that interacting objects exert equal and opposite forces on each other	Newton's third law pairs the swimmer's push on water with water's push on the swimmer.
349	conservation of momentum	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: conservation + of + momentum. Study the complete expression as one field-specific unit.	the principle that total momentum remains constant in an isolated system	Conservation of momentum explains the motion of two skaters who push apart.
350	elastic collision	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: elastic + collision. Study the complete expression as one field-specific unit.	a collision in which both total momentum and total kinetic energy are conserved	An ideal elastic collision allows two hard spheres to rebound without losing kinetic energy.

Forces and Solutions

Reading practice for pages 10–12. Five relevant words are highlighted.

English reading

A beaker rests on a scale while gravitational force pulls it downward and normal force from the scale pushes upward. Inside, a precipitation reaction forms a solid from two clear solutions. The chemist describes each solution concentration with molarity, the number of moles of dissolved substance per liter of solution.

Reading comprehension

1. Which force pulls the beaker downward?

Gravitational force pulls it downward.

2. What forms during a precipitation reaction?

A solid forms from the solutions.

3. What does molarity measure?

Molarity measures moles of solute per liter of solution.

Cloze vocabulary quiz

1. Earth's ___ pulls the ball downward.

Answer: gravitational force

2. Evaporation increased the ___.

Answer: solution concentration

3. Mixing silver nitrate and sodium chloride causes a ___.

Answer: precipitation reaction

4. The table's ___ balances the book's weight.

Answer: normal force

5. The beaker contained a ___ of 0.5 moles per liter.

Answer: molarity

Page 11: words 351–385

Vocabulary page 11
#	Word	Details	Meaning	Sample sentence
351	inelastic collision	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: inelastic + collision. Study the complete expression as one field-specific unit.	a collision in which momentum is conserved but kinetic energy is transformed into other forms	Cars that crumple together undergo an inelastic collision.
352	work-energy theorem	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: work + energy + theorem. Study the complete expression as one field-specific unit.	the principle that net work on an object equals its change in kinetic energy	The work-energy theorem connects the pushing force with the cart's increased speed.
353	ideal mechanical advantage	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: ideal + mechanical + advantage. Study the complete expression as one field-specific unit.	the theoretical force multiplication of a machine without accounting for friction	A longer input arm increases a lever's ideal mechanical advantage.
354	conservation of energy	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: conservation + of + energy. Study the complete expression as one field-specific unit.	the principle that energy changes form but is not created or destroyed	Conservation of energy means the pendulum's potential and kinetic energy trade places.
355	gravitational potential energy	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: gravitational + potential + energy. Study the complete expression as one field-specific unit.	stored energy associated with position in a gravitational field	Lifting the backpack increases its gravitational potential energy.
356	elastic potential energy	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: elastic + potential + energy. Study the complete expression as one field-specific unit.	energy stored when an elastic object is stretched or compressed	A drawn bow contains elastic potential energy.
357	wave frequency	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: wave + frequency. Study the complete expression as one field-specific unit.	the number of complete wave cycles passing a point per unit time	Increasing wave frequency raises the pitch of a sound.
358	wave amplitude	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: wave + amplitude. Study the complete expression as one field-specific unit.	the maximum displacement of a wave from its resting position	A louder sound usually has greater wave amplitude.
359	wave period	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: wave + period. Study the complete expression as one field-specific unit.	the time required for one complete wave cycle	A two-hertz wave has a wave period of half a second.
360	wave speed	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: wave + speed. Study the complete expression as one field-specific unit.	the distance a wave travels per unit time	Wave speed depends on the medium through which the disturbance moves.
361	transverse wave	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: transverse + wave. Study the complete expression as one field-specific unit.	a wave whose disturbance is perpendicular to its direction of travel	A wave on a stretched rope can be a transverse wave.
362	longitudinal wave	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: longitudinal + wave. Study the complete expression as one field-specific unit.	a wave whose disturbance is parallel to its direction of travel	Sound in air travels as a longitudinal wave.
363	constructive interference	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: constructive + interference. Study the complete expression as one field-specific unit.	the combination of waves that produces a larger amplitude	Two crests meeting create constructive interference.
364	destructive interference	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: destructive + interference. Study the complete expression as one field-specific unit.	the combination of waves that reduces or cancels amplitude	A crest meeting a trough can cause destructive interference.
365	wave refraction	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: wave + refraction. Study the complete expression as one field-specific unit.	a change in wave direction caused by a change in speed	Wave refraction bends light as it enters glass.
366	wave reflection	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: wave + reflection. Study the complete expression as one field-specific unit.	the return of a wave from a boundary	An echo results from wave reflection.
367	standing wave	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: standing + wave. Study the complete expression as one field-specific unit.	a wave pattern with fixed nodes formed by interfering waves traveling in opposite directions	A vibrating guitar string forms a standing wave.
368	natural frequency	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: natural + frequency. Study the complete expression as one field-specific unit.	the frequency at which a system tends to vibrate when disturbed	The tuning fork rings at its natural frequency.
369	Doppler effect	proper noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: Doppler + effect. Study the complete expression as one field-specific unit.	the apparent change in observed frequency caused by relative motion between source and observer	The Doppler effect makes an approaching siren sound higher.
370	electromagnetic spectrum	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: electromagnetic + spectrum. Study the complete expression as one field-specific unit.	the full range of electromagnetic radiation arranged by frequency or wavelength	Visible light occupies a small part of the electromagnetic spectrum.
371	igneous rock	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: igneous + rock. Study the complete expression as one field-specific unit.	rock formed when molten material cools and solidifies	Granite is an igneous rock that cooled slowly underground.
372	sedimentary rock	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: sedimentary + rock. Study the complete expression as one field-specific unit.	rock formed from compacted sediments or from materials deposited out of solution	Sandstone is a sedimentary rock made from cemented sand grains.
373	metamorphic rock	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: metamorphic + rock. Study the complete expression as one field-specific unit.	rock changed by heat, pressure, or reactive fluids without fully melting	Marble is a metamorphic rock formed from limestone.
374	rock weathering	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: rock + weathering. Study the complete expression as one field-specific unit.	the physical or chemical breakdown of rock at Earth's surface	Freezing water causes rock weathering by widening cracks.
375	sediment deposition	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: sediment + deposition. Study the complete expression as one field-specific unit.	the settling and accumulation of transported particles	Slower river water causes sediment deposition near the mouth.
376	soil horizon	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: soil + horizon. Study the complete expression as one field-specific unit.	a distinct layer in soil with characteristic composition and properties	Dark organic material is common in the upper soil horizon.
377	tectonic theory	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: tectonic + theory. Study the complete expression as one field-specific unit.	the scientific explanation that Earth's outer shell is divided into moving plates	Tectonic theory accounts for matching earthquake belts and plate boundaries.
378	continental movement	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: continental + movement. Study the complete expression as one field-specific unit.	the long-term change in continent positions caused by plate motion	Fossil evidence helped scientists reconstruct continental movement.
379	seafloor spreading	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: seafloor + spreading. Study the complete expression as one field-specific unit.	the formation of new oceanic crust as magma rises at a mid-ocean ridge	Magnetic stripes provide evidence for seafloor spreading.
380	convergent boundary	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: convergent + boundary. Study the complete expression as one field-specific unit.	a plate boundary where two plates move toward each other	A deep trench can form at a convergent boundary.
381	divergent boundary	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: divergent + boundary. Study the complete expression as one field-specific unit.	a plate boundary where two plates move apart	New crust forms at an oceanic divergent boundary.
382	transform boundary	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: transform + boundary. Study the complete expression as one field-specific unit.	a plate boundary where two plates slide horizontally past each other	Shallow earthquakes are common along a transform boundary.
383	earthquake focus	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: earthquake + focus. Study the complete expression as one field-specific unit.	the underground point where earthquake rupture begins	Seismic waves spread outward from the earthquake focus.
384	moment magnitude	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: moment + magnitude. Study the complete expression as one field-specific unit.	a measure of earthquake size based on fault area, movement, and rock stiffness	The moment magnitude scale compares the energy of large earthquakes.
385	volcanic hotspot	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: volcanic + hotspot. Study the complete expression as one field-specific unit.	a region of persistent magma generation that may lie far from a plate boundary	An island chain formed as a plate moved over a volcanic hotspot.

Page 11 vocabulary review

Review five selected words from page 11.

Cloze vocabulary quiz

1. Magnetic stripes provide evidence for ___.

Answer: seafloor spreading

2. ___ means the pendulum's potential and kinetic energy trade places.

Answer: conservation of energy

3. A vibrating guitar string forms a ___.

Answer: standing wave

4. A deep trench can form at a ___.

Answer: convergent boundary

5. Lifting the backpack increases its ___.

Answer: gravitational potential energy

Page 12: words 386–420

Vocabulary page 12
#	Word	Details	Meaning	Sample sentence
386	mantle plume	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: mantle + plume. Study the complete expression as one field-specific unit.	a proposed column of unusually hot rock rising through Earth's mantle	A mantle plume may supply magma to the hotspot.
387	P wave	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: P + wave. Study the complete expression as one field-specific unit.	a compressional seismic wave that travels fastest through Earth's interior	The P wave arrived before the other seismic waves.
388	S wave	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: S + wave. Study the complete expression as one field-specific unit.	a transverse seismic wave that cannot travel through liquid	The absence of an S wave through the outer core helped reveal that the layer is liquid.
389	rain shadow	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: rain + shadow. Study the complete expression as one field-specific unit.	a dry region on the downwind side of a mountain range	The desert lies in a rain shadow beyond the coastal mountains.
390	drainage basin	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: drainage + basin. Study the complete expression as one field-specific unit.	the land area from which water flows into one river, lake, or other outlet	Pollution upstream can affect the entire drainage basin.
391	climate system	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: climate + system. Study the complete expression as one field-specific unit.	the interacting atmosphere, ocean, ice, land, and living components that shape climate	The climate system transfers heat through winds and ocean currents.
392	positive feedback	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: positive + feedback. Study the complete expression as one field-specific unit.	a process in which an initial change produces effects that increase that change	Melting ice creates positive feedback because darker water absorbs more sunlight.
393	negative feedback	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: negative + feedback. Study the complete expression as one field-specific unit.	a process in which an initial change produces effects that reduce that change	Heat loss from warmer Earth acts as a negative feedback.
394	carbon sink	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: carbon + sink. Study the complete expression as one field-specific unit.	a reservoir that absorbs more carbon than it releases	A growing forest can function as a carbon sink.
395	albedo	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Base-form focus: albedo is the dictionary headword; compare its inflected or derived forms in context.	the fraction of incoming light that a surface reflects	Fresh snow has a high albedo.
396	ocean acidification	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: ocean + acidification. Study the complete expression as one field-specific unit.	the decrease in ocean pH caused mainly by absorption of atmospheric carbon dioxide	Ocean acidification makes shell building harder for some organisms.
397	sea-level rise	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: sea + level + rise. Study the complete expression as one field-specific unit.	an increase in average ocean height caused by warming water and melting land ice	Sea-level rise increases coastal flood risk.
398	ecological footprint	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: ecological + footprint. Study the complete expression as one field-specific unit.	an estimate of the biologically productive area needed to support a person's or population's resource use	Eating less resource-intensive food can reduce an ecological footprint.
399	resource depletion	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: resource + depletion. Study the complete expression as one field-specific unit.	the use of a resource faster than it can be replaced or renewed	Overpumping groundwater causes resource depletion.
400	environmental justice	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: environmental + justice. Study the complete expression as one field-specific unit.	fair treatment and meaningful participation in environmental decisions and protections	Environmental justice asks why some communities face greater pollution exposure.
401	function rule	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: function + rule. Study the complete expression as one field-specific unit.	a mathematical instruction that assigns exactly one output to each permitted input	The function rule doubles each input and then adds three.
402	mathematical relation	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: mathematical + relation. Study the complete expression as one field-specific unit.	a set of ordered pairs connecting values from two sets	The mathematical relation is not a function because one input has two outputs.
403	function notation	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: function + notation. Study the complete expression as one field-specific unit.	symbolic notation, such as f(x), used to name a function and its input	In function notation, f(4) means the output when the input is four.
404	independent variable	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: independent + variable. Study the complete expression as one field-specific unit.	a variable chosen or controlled to examine its effect on another variable	Time is the independent variable on the horizontal axis.
405	dependent variable	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: dependent + variable. Study the complete expression as one field-specific unit.	a measured variable whose value may change in response to another variable	Plant height is the dependent variable in the experiment.
406	input-output table	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: input + output + table. Study the complete expression as one field-specific unit.	a table pairing input values with the corresponding outputs of a rule	The input-output table reveals that every output is five more than its input.
407	arithmetic sequence	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: arithmetic + sequence. Study the complete expression as one field-specific unit.	a number sequence with a constant difference between consecutive terms	Three, seven, eleven, and fifteen form an arithmetic sequence.
408	geometric sequence	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: geometric + sequence. Study the complete expression as one field-specific unit.	a number sequence with a constant ratio between consecutive terms	Two, six, eighteen, and fifty-four form a geometric sequence.
409	recursive formula	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: recursive + formula. Study the complete expression as one field-specific unit.	a rule that defines each term by using one or more earlier terms	The recursive formula adds four to the preceding term.
410	explicit formula	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: explicit + formula. Study the complete expression as one field-specific unit.	a rule that calculates any term directly from its position	The explicit formula gives the fiftieth term without listing the earlier terms.
411	common difference	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: common + difference. Study the complete expression as one field-specific unit.	the constant amount added between consecutive terms of an arithmetic sequence	The sequence 5, 8, 11 has a common difference of three.
412	common ratio	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: common + ratio. Study the complete expression as one field-specific unit.	the constant multiplier between consecutive terms of a geometric sequence	The sequence 4, 12, 36 has a common ratio of three.
413	exponential function	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: exponential + function. Study the complete expression as one field-specific unit.	a function in which a constant base is raised to a variable exponent	The exponential function models a population that doubles each year.
414	quadratic function	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: quadratic + function. Study the complete expression as one field-specific unit.	a function whose highest variable power is two	The graph of a quadratic function is a parabola.
415	parabola	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Base-form focus: parabola is the dictionary headword; compare its inflected or derived forms in context.	a symmetrical U-shaped curve formed by the graph of a quadratic function	The ball's idealized path resembles a downward-opening parabola.
416	parabola vertex	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: parabola + vertex. Study the complete expression as one field-specific unit.	the turning point at which a parabola reaches its maximum or minimum value	The parabola vertex gives the projectile's greatest height.
417	axis of symmetry	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: axis + of + symmetry. Study the complete expression as one field-specific unit.	a line dividing a figure or graph into mirror-image halves	The axis of symmetry passes through the vertex of the parabola.
418	quadratic equation	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: quadratic + equation. Study the complete expression as one field-specific unit.	an equation whose highest variable power is two	The quadratic equation has two real solutions.
419	leading coefficient	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: leading + coefficient. Study the complete expression as one field-specific unit.	the coefficient of the term with the highest power	A negative leading coefficient makes this parabola open downward.
420	constant term	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: constant + term. Study the complete expression as one field-specific unit.	a term without a variable	In the expression 3x plus 7, seven is the constant term.

Page 12 vocabulary review

Review five selected words from page 12.

Cloze vocabulary quiz

1. The ___ passes through the vertex of the parabola.

Answer: axis of symmetry

2. Melting ice creates ___ because darker water absorbs more sunlight.

Answer: positive feedback

3. Plant height is the ___ in the experiment.

Answer: dependent variable

4. The ___ has two real solutions.

Answer: quadratic equation

5. Heat loss from warmer Earth acts as a ___.

Answer: negative feedback

Page 13: words 421–455

Vocabulary page 13
#	Word	Details	Meaning	Sample sentence
421	factorization	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Suffix focus: -ization forms a noun for a process of making or becoming.	the rewriting of an expression as a product of factors	Factorization changes x squared minus nine into the product of x minus three and x plus three.
422	greatest common factor	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: greatest + common + factor. Study the complete expression as one field-specific unit.	the largest factor shared by two or more numbers or terms	Six is the greatest common factor of eighteen and twenty-four.
423	difference of squares	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: difference + of + squares. Study the complete expression as one field-specific unit.	an expression in the form of one square minus another square	The difference of squares x squared minus sixteen factors into two binomials.
424	perfect square trinomial	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: perfect + square + trinomial. Study the complete expression as one field-specific unit.	a three-term expression produced by squaring a binomial	The expression x squared plus six x plus nine is a perfect square trinomial.
425	radical expression	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: radical + expression. Study the complete expression as one field-specific unit.	an expression containing a root symbol	The radical expression square root of fifty simplifies to five square root of two.
426	rational expression	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: rational + expression. Study the complete expression as one field-specific unit.	a quotient of polynomial expressions with a nonzero denominator	The rational expression is undefined when its denominator equals zero.
427	absolute-value equation	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: absolute + value + equation. Study the complete expression as one field-specific unit.	an equation containing a variable inside absolute-value symbols	The absolute-value equation has solutions two units on either side of five.
428	compound inequality	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: compound + inequality. Study the complete expression as one field-specific unit.	two inequalities joined by and or or	The compound inequality describes all values between negative one and four.
429	interval notation	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: interval + notation. Study the complete expression as one field-specific unit.	a compact notation using brackets or parentheses to describe a set of real numbers	The solution x greater than three is written in interval notation with a parenthesis at three.
430	coordinate pair	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: coordinate + pair. Study the complete expression as one field-specific unit.	two values that locate a point in a plane	The coordinate pair negative two, five lies in the second quadrant.
431	direct proportion	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: direct + proportion. Study the complete expression as one field-specific unit.	a relationship in which two quantities have a constant ratio	Distance and time are in direct proportion when speed remains constant.
432	inverse proportion	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: inverse + proportion. Study the complete expression as one field-specific unit.	a relationship in which one quantity increases as the other decreases so their product stays constant	For a fixed trip, speed and travel time are in inverse proportion.
433	slope-intercept form	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: slope + intercept + form. Study the complete expression as one field-specific unit.	the linear-equation form y equals mx plus b	Slope-intercept form displays a line's slope and vertical intercept directly.
434	point-slope form	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: point + slope + form. Study the complete expression as one field-specific unit.	a linear-equation form using one point and the line's slope	Point-slope form makes it easy to write the equation from a point and a slope.
435	standard form	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: standard + form. Study the complete expression as one field-specific unit.	a conventional arrangement of a linear equation as Ax plus By equals C	The equation was rewritten in standard form with integer coefficients.
436	system of inequalities	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: system + of + inequalities. Study the complete expression as one field-specific unit.	two or more inequalities considered together	The solution to the system of inequalities is the overlapping shaded region.
437	linear inequality	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: linear + inequality. Study the complete expression as one field-specific unit.	an inequality whose boundary is a straight line	The linear inequality includes points above the dashed boundary.
438	exponential growth	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: exponential + growth. Study the complete expression as one field-specific unit.	increase by a constant percentage or factor over equal intervals	Compound interest produces exponential growth.
439	exponential decay	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: exponential + decay. Study the complete expression as one field-specific unit.	decrease by a constant percentage or factor over equal intervals	Radioactive material undergoes exponential decay.
440	percent change	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: percent + change. Study the complete expression as one field-specific unit.	change expressed as a percentage of the original value	The price rose from forty to fifty dollars, a percent change of twenty-five percent.
441	depreciation	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Suffix focus: -ation commonly forms a noun naming an action, process, or result.	decrease in an asset's value over time	The car's depreciation was steepest during its first year.
442	conditional probability	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: conditional + probability. Study the complete expression as one field-specific unit.	the probability of an event given that another event has occurred	The conditional probability of rain changes when dark clouds are already present.
443	permutation	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Suffix focus: -ation commonly forms a noun naming an action, process, or result.	an arrangement in which the order of chosen items matters	Each different ordering of the three books is a permutation.
444	combination	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Suffix focus: -ation commonly forms a noun naming an action, process, or result.	a selection in which order does not matter	Choosing three committee members from ten is a combination.
445	sample survey	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: sample + survey. Study the complete expression as one field-specific unit.	a study that asks questions of part of a population to estimate the whole population's views	The sample survey contacted randomly selected households.
446	observational study	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: observational + study. Study the complete expression as one field-specific unit.	research that records existing conditions without assigning treatments	The observational study compares sleep habits and grades without changing either.
447	controlled experiment	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: controlled + experiment. Study the complete expression as one field-specific unit.	a study that deliberately changes one factor while comparing outcomes under controlled conditions	The controlled experiment assigns plants to different light levels.
448	population parameter	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: population + parameter. Study the complete expression as one field-specific unit.	a numerical characteristic of an entire population	The true average height of all trees in the forest is a population parameter.
449	sample statistic	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: sample + statistic. Study the complete expression as one field-specific unit.	a numerical characteristic calculated from a sample	The sample mean is a sample statistic used to estimate the population average.
450	mean absolute deviation	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: mean + absolute + deviation. Study the complete expression as one field-specific unit.	the average distance of data values from their mean	A small mean absolute deviation indicates that values cluster near the mean.
451	population variance	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: population + variance. Study the complete expression as one field-specific unit.	the average squared distance of all population values from their mean	Population variance increases when observations spread farther from the average.
452	z-score	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: z + score. Study the complete expression as one field-specific unit.	the number of standard deviations a value lies above or below the mean	A z-score of two places the value two standard deviations above the mean.
453	normal distribution	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: normal + distribution. Study the complete expression as one field-specific unit.	a symmetrical bell-shaped probability distribution defined by its mean and standard deviation	Adult measurement data often approximate a normal distribution.
454	skewness	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Suffix focus: -ness forms a noun naming a quality or state.	the degree and direction of asymmetry in a data distribution	A few very high incomes create positive skewness.
455	correlation coefficient	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: correlation + coefficient. Study the complete expression as one field-specific unit.	a number from negative one to one measuring the direction and strength of a linear relationship	A correlation coefficient near zero indicates little linear association.

Planning a Survey

Reading practice for pages 13–15. Five relevant words are highlighted.

English reading

A survey team plots each response as a coordinate pair and calculates a correlation coefficient to describe the linear association. A strong association does not prove direct proportion or causation. The team also uses conditional probability to compare subgroups, then considers every permutation of question order to test whether sequence changes responses.

Reading comprehension

1. What does the correlation coefficient describe?

It describes the linear association between variables.

2. Does a strong association prove causation?

No, a strong association does not prove causation.

3. Why test each permutation of question order?

The team wants to see whether order changes responses.

Cloze vocabulary quiz

1. The ___ of rain changes when dark clouds are already present.

Answer: conditional probability

2. A ___ near zero indicates little linear association.

Answer: correlation coefficient

3. The ___ negative two, five lies in the second quadrant.

Answer: coordinate pair

4. Each different ordering of the three books is a ___.

Answer: permutation

5. Distance and time are in ___ when speed remains constant.

Answer: direct proportion

Page 14: words 456–490

Vocabulary page 14
#	Word	Details	Meaning	Sample sentence
456	residual	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Base-form focus: residual is the dictionary headword; compare its inflected or derived forms in context.	the difference between an observed value and the value predicted by a model	A positive residual means the observation lies above the prediction.
457	residual plot	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: residual + plot. Study the complete expression as one field-specific unit.	a graph of residuals used to evaluate how well a model fits data	A curved pattern in the residual plot suggests that a linear model is unsuitable.
458	interpolation	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Suffix focus: -ation commonly forms a noun naming an action, process, or result.	estimation of a value within the range of known data	Interpolation estimates the temperature between two recorded times.
459	two-column proof	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: two + column + proof. Study the complete expression as one field-specific unit.	a geometric proof listing statements beside the reasons that justify them	The two-column proof pairs each angle claim with a definition or theorem.
460	paragraph proof	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: paragraph + proof. Study the complete expression as one field-specific unit.	a geometric proof written as connected explanatory sentences	The paragraph proof explains why corresponding parts of the triangles are congruent.
461	logical statement	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: logical + statement. Study the complete expression as one field-specific unit.	a declarative sentence that has a truth value	“Seven is prime” is a true logical statement.
462	conditional statement	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: conditional + statement. Study the complete expression as one field-specific unit.	a logical statement in if-then form	The conditional statement says that if an angle is right, then it measures ninety degrees.
463	converse	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Base-form focus: converse is the dictionary headword; compare its inflected or derived forms in context.	the statement formed by switching the hypothesis and conclusion of a conditional	The converse of “if it is a square, then it is a rectangle” is not always true.
464	inverse	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Base-form focus: inverse is the dictionary headword; compare its inflected or derived forms in context.	the statement formed by negating both the hypothesis and conclusion of a conditional	The inverse does not necessarily share the original statement's truth value.
465	contrapositive	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Base-form focus: contrapositive is the dictionary headword; compare its inflected or derived forms in context.	the statement formed by switching and negating a conditional's hypothesis and conclusion	A conditional and its contrapositive are logically equivalent.
466	biconditional	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Base-form focus: biconditional is the dictionary headword; compare its inflected or derived forms in context.	a statement asserting that two conditions are both necessary and sufficient	A biconditional can be written with the phrase “if and only if.”
467	truth value	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: truth + value. Study the complete expression as one field-specific unit.	the classification of a logical statement as true or false	A counterexample proves that the universal statement has a false truth value.
468	axiomatic system	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: axiomatic + system. Study the complete expression as one field-specific unit.	a logical framework built from undefined terms, definitions, axioms, and derived theorems	Euclidean geometry is an axiomatic system.
469	congruence theorem	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: congruence + theorem. Study the complete expression as one field-specific unit.	a proven rule for establishing that figures have the same size and shape	The side-angle-side congruence theorem proves the triangles match.
470	similarity theorem	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: similarity + theorem. Study the complete expression as one field-specific unit.	a proven rule for establishing that figures have equal corresponding angles and proportional sides	The angle-angle similarity theorem applies to the two triangles.
471	triangle congruence	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: triangle + congruence. Study the complete expression as one field-specific unit.	the condition in which two triangles match exactly in size and shape	Three corresponding side lengths can establish triangle congruence.
472	angle relationship	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: angle + relationship. Study the complete expression as one field-specific unit.	a defined connection between angles created by lines or shapes	The diagram shows an angle relationship between alternate interior angles.
473	parallel line	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: parallel + line. Study the complete expression as one field-specific unit.	one of two coplanar lines that never intersect	Each rail is a parallel line relative to the other.
474	algorithmic procedure	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: algorithmic + procedure. Study the complete expression as one field-specific unit.	a finite ordered set of steps for solving a problem or completing a task	The sorting program follows an algorithmic procedure.
475	pseudocode	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Base-form focus: pseudocode is the dictionary headword; compare its inflected or derived forms in context.	a language-independent description of an algorithm written in structured ordinary language	The pseudocode states when the loop should stop.
476	flowchart	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Base-form focus: flowchart is the dictionary headword; compare its inflected or derived forms in context.	a diagram using connected shapes to show steps and decisions in a process	The flowchart sends a failed login back to the password step.
477	variable declaration	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: variable + declaration. Study the complete expression as one field-specific unit.	a programming statement that creates a variable and may specify its type or initial value	The variable declaration reserves storage for the score.
478	data type	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: data + type. Study the complete expression as one field-specific unit.	a classification that determines what values data can hold and what operations are valid	A Boolean data type stores true or false.
479	Boolean	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Capitalization focus: Boolean is conventionally capitalized because the term comes from the name George Boole.	a logical data value restricted to true or false	The comparison returns a Boolean.
480	conditional branch	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: conditional + branch. Study the complete expression as one field-specific unit.	a section of code selected according to whether a condition is true	The conditional branch displays an error when the password is incorrect.
481	loop	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Base-form focus: loop is the dictionary headword; compare its inflected or derived forms in context.	a programming structure that repeats instructions while a condition holds or for a set number of times	The loop processes every item in the list.
482	loop iteration	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: loop + iteration. Study the complete expression as one field-specific unit.	one complete execution of a loop's repeated instructions	During each loop iteration, the index increases by one.
483	debugging	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Base-form focus: debugging is the dictionary headword; compare its inflected or derived forms in context.	the process of finding, understanding, and correcting defects in software	Debugging revealed that the program compared text instead of numbers.
484	compiler	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Base-form focus: compiler is the dictionary headword; compare its inflected or derived forms in context.	software that translates a complete program into another form before execution	The compiler reported a missing bracket.
485	interpreter	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Base-form focus: interpreter is the dictionary headword; compare its inflected or derived forms in context.	software that reads and executes program instructions directly	The interpreter stopped when it encountered an undefined name.
486	source code	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: source + code. Study the complete expression as one field-specific unit.	human-readable instructions written in a programming language	The developer reviewed the source code before releasing the update.
487	object code	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: object + code. Study the complete expression as one field-specific unit.	low-level instructions produced by translating source code for a computer	The compiler converted the program into object code.
488	network security	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: network + security. Study the complete expression as one field-specific unit.	protection of connected systems and data from unauthorized access or disruption	Network security includes firewalls, monitoring, and controlled permissions.
489	data encryption	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: data + encryption. Study the complete expression as one field-specific unit.	the conversion of readable data into coded form requiring a key to restore	Data encryption protects the message while it travels across the network.
490	decryption	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Suffix focus: -tion commonly forms a noun naming an action, process, or result.	the conversion of encrypted information back into readable form	Authorized decryption requires the correct key.

Page 14 vocabulary review

Review five selected words from page 14.

Cloze vocabulary quiz

1. The ___ displays an error when the password is incorrect.

Answer: conditional branch

2. Euclidean geometry is an ___.

Answer: axiomatic system

3. The ___ processes every item in the list.

Answer: loop

4. A positive ___ means the observation lies above the prediction.

Answer: residual

5. The side-angle-side ___ proves the triangles match.

Answer: congruence theorem

Page 15: words 491–525

Vocabulary page 15
#	Word	Details	Meaning	Sample sentence
491	authentication	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Suffix focus: -ation commonly forms a noun naming an action, process, or result.	the process of verifying a user's or system's identity	Two-factor authentication requires both a password and a temporary code.
492	password manager	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: password + manager. Study the complete expression as one field-specific unit.	software that securely stores and generates account credentials	A password manager can create a different strong password for every site.
493	phishing	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Base-form focus: phishing is the dictionary headword; compare its inflected or derived forms in context.	a fraudulent attempt to steal information by imitating a trusted message or service	The urgent email was phishing designed to capture login details.
494	malware	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Base-form focus: malware is the dictionary headword; compare its inflected or derived forms in context.	software designed to damage, disrupt, spy on, or gain unauthorized access to systems	The attachment installed malware on the unprotected computer.
495	ransomware	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Base-form focus: ransomware is the dictionary headword; compare its inflected or derived forms in context.	malware that blocks access to data or systems and demands payment	The hospital restored backups after a ransomware attack.
496	online trace	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: online + trace. Study the complete expression as one field-specific unit.	the record of information left by a person's activities on connected services	Old public comments remain part of a user's online trace.
497	data privacy	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: data + privacy. Study the complete expression as one field-specific unit.	control and protection concerning how personal information is collected, used, and shared	The app's data privacy policy explains whether location records are sold.
498	cloud computing	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: cloud + computing. Study the complete expression as one field-specific unit.	delivery of storage, processing, or software through remote networked servers	Cloud computing lets the team edit the same document from several locations.
499	relational database	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: relational + database. Study the complete expression as one field-specific unit.	an organized data system that connects information stored in tables through shared fields	The relational database links each order to a customer identifier.
500	query	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Base-form focus: query is the dictionary headword; compare its inflected or derived forms in context.	a structured request to retrieve or change information in a database	The query returns all books published after 2020.
501	Neolithic Revolution	proper noun Study Field: Grade 9 world-history, civics, and geography term Word study: Term structure: Neolithic + Revolution. Study the complete expression as one field-specific unit.	the broad transition from foraging to farming and settled communities	The Neolithic Revolution supported permanent villages but also changed diet and disease patterns.
502	agricultural surplus	noun Study Field: Grade 9 world-history, civics, and geography term Word study: Term structure: agricultural + surplus. Study the complete expression as one field-specific unit.	food production beyond the immediate needs of the producers	An agricultural surplus allowed some residents to become craftspeople or officials.
503	specialization of labor	noun Study Field: Grade 9 world-history, civics, and geography term Word study: Term structure: specialization + of + labor. Study the complete expression as one field-specific unit.	the division of work into distinct occupations or tasks	Specialization of labor produced skilled metalworkers and scribes.
504	social hierarchy	noun Study Field: Grade 9 world-history, civics, and geography term Word study: Term structure: social + hierarchy. Study the complete expression as one field-specific unit.	an arrangement of groups or individuals by rank, wealth, status, or power	The burial goods reveal a social hierarchy within the ancient city.
505	centralized government	noun Study Field: Grade 9 world-history, civics, and geography term Word study: Term structure: centralized + government. Study the complete expression as one field-specific unit.	a political system in which major authority is concentrated in a central institution or ruler	A centralized government collected taxes across the kingdom.
506	codified law	noun Study Field: Grade 9 world-history, civics, and geography term Word study: Term structure: codified + law. Study the complete expression as one field-specific unit.	law organized and recorded in a systematic written form	Codified law made official penalties publicly knowable.
507	cuneiform	noun Study Field: Grade 9 world-history, civics, and geography term Word study: Base-form focus: cuneiform is the dictionary headword; compare its inflected or derived forms in context.	a wedge-shaped writing system developed in ancient Mesopotamia	Scribes pressed cuneiform signs into wet clay tablets.
508	hieroglyphics	noun Study Field: Grade 9 world-history, civics, and geography term Word study: Base-form focus: hieroglyphics is the dictionary headword; compare its inflected or derived forms in context.	a writing system using pictorial or symbolic characters	Egyptian hieroglyphics appeared on monuments and papyrus.
509	polytheism	noun Study Field: Grade 9 world-history, civics, and geography term Word study: Suffix focus: -ism often names a belief, system, movement, or practice.	belief in or worship of more than one deity	Greek polytheism included gods associated with the sea, wisdom, and agriculture.
510	monotheism	noun Study Field: Grade 9 world-history, civics, and geography term Word study: Suffix focus: -ism often names a belief, system, movement, or practice.	belief in or worship of one deity	Monotheism became central to several major religious traditions.
511	Mesopotamia	proper noun Study Field: Grade 9 world-history, civics, and geography term Word study: Capitalization focus: this is a proper name, so its standard written form begins with a capital letter.	an ancient region between and around the Tigris and Euphrates rivers	Mesopotamia contained some of the world's earliest cities.
512	Fertile Crescent	proper noun Study Field: Grade 9 world-history, civics, and geography term Word study: Term structure: Fertile + Crescent. Study the complete expression as one field-specific unit.	a curved region of productive land in Southwest Asia where early farming societies developed	Wheat and barley cultivation spread through the Fertile Crescent.
513	Hammurabi's Code	proper noun Study Field: Grade 9 world-history, civics, and geography term Word study: Term structure: Hammurabi's + Code. Study the complete expression as one field-specific unit.	a Babylonian collection of laws and legal judgments associated with King Hammurabi	Hammurabi's Code reveals differences in legal status within Babylonian society.
514	Indus Valley	proper noun Study Field: Grade 9 world-history, civics, and geography term Word study: Term structure: Indus + Valley. Study the complete expression as one field-specific unit.	the South Asian river region associated with Harappan urban civilization	Cities in the Indus Valley used carefully planned streets and drainage.
515	Mandate of Heaven	proper noun Study Field: Grade 9 world-history, civics, and geography term Word study: Term structure: Mandate + of + Heaven. Study the complete expression as one field-specific unit.	a Chinese political idea that a ruler's authority depended on moral governance	Rebellion could be justified by claiming that a dynasty had lost the Mandate of Heaven.
516	dynastic cycle	noun Study Field: Grade 9 world-history, civics, and geography term Word study: Term structure: dynastic + cycle. Study the complete expression as one field-specific unit.	a model describing the rise, decline, and replacement of ruling dynasties	The dynastic cycle connected political disorder with the loss of legitimate rule.
517	polis	noun Study Field: Grade 9 world-history, civics, and geography term Word study: Base-form focus: polis is the dictionary headword; compare its inflected or derived forms in context.	an independent city-state in ancient Greece	Athens developed as a polis with its own laws and institutions.
518	Athenian democracy	proper noun Study Field: Grade 9 world-history, civics, and geography term Word study: Term structure: Athenian + democracy. Study the complete expression as one field-specific unit.	the system in ancient Athens in which eligible male citizens participated directly in government	Athenian democracy excluded women, enslaved people, and foreigners from citizenship.
519	Roman republic	proper noun Study Field: Grade 9 world-history, civics, and geography term Word study: Term structure: Roman + republic. Study the complete expression as one field-specific unit.	the period and system of Roman government before rule by emperors	The Roman republic divided authority among elected offices, assemblies, and the Senate.
520	republican government	noun Study Field: Grade 9 world-history, civics, and geography term Word study: Term structure: republican + government. Study the complete expression as one field-specific unit.	a political system in which public authority is exercised through representatives and laws rather than hereditary rule	A republican government depends on civic institutions and accountable officials.
521	patrician	noun Study Field: Grade 9 world-history, civics, and geography term Word study: Base-form focus: patrician is the dictionary headword; compare its inflected or derived forms in context.	a member of the hereditary elite class in ancient Rome	The patrician family held land and competed for high office.
522	plebeian	noun Study Field: Grade 9 world-history, civics, and geography term Word study: Base-form focus: plebeian is the dictionary headword; compare its inflected or derived forms in context.	a member of the common citizen class in ancient Rome	Plebeian protests gained greater political protections over time.
523	consul	noun Study Field: Grade 9 world-history, civics, and geography term Word study: Base-form focus: consul is the dictionary headword; compare its inflected or derived forms in context.	one of the two chief annually elected officials in the Roman republic	Each consul could limit the other's power.
524	tribune	noun Study Field: Grade 9 world-history, civics, and geography term Word study: Base-form focus: tribune is the dictionary headword; compare its inflected or derived forms in context.	a Roman official elected to protect the interests of common citizens	The tribune could veto certain actions that threatened plebeians.
525	senate	noun Study Field: Grade 9 world-history, civics, and geography term Word study: Base-form focus: senate is the dictionary headword; compare its inflected or derived forms in context.	a deliberative governing council, especially the influential council of ancient Rome	The Roman senate advised officials and controlled important financial decisions.

Page 15 vocabulary review

Review five selected words from page 15.

Cloze vocabulary quiz

1. The urgent email was ___ designed to capture login details.

Answer: phishing

2. The attachment installed ___ on the unprotected computer.

Answer: malware

3. The hospital restored backups after a ___ attack.

Answer: ransomware

4. Old public comments remain part of a user's ___.

Answer: online trace

5. The app's ___ policy explains whether location records are sold.

Answer: data privacy

Page 16: words 526–560

Vocabulary page 16
#	Word	Details	Meaning	Sample sentence
526	Pax Romana	proper noun Study Field: Grade 9 world-history, civics, and geography term Word study: Term structure: Pax + Romana. Study the complete expression as one field-specific unit.	a long period of relative stability within the Roman Empire	Trade expanded across imperial roads during the Pax Romana.
527	civil law	noun Study Field: Grade 9 world-history, civics, and geography term Word study: Term structure: civil + law. Study the complete expression as one field-specific unit.	a legal tradition based on written codes and rules governing private rights and disputes	Roman civil law influenced many later European legal systems.
528	aqueduct	noun Study Field: Grade 9 world-history, civics, and geography term Word study: Base-form focus: aqueduct is the dictionary headword; compare its inflected or derived forms in context.	a constructed channel that carries water over a distance	The aqueduct supplied the city from a mountain spring.
529	feudal hierarchy	noun Study Field: Grade 9 world-history, civics, and geography term Word study: Term structure: feudal + hierarchy. Study the complete expression as one field-specific unit.	a ranked medieval system of obligations linking rulers, nobles, vassals, and dependents	Landholding and loyalty shaped the feudal hierarchy.
530	serfdom	noun Study Field: Grade 9 world-history, civics, and geography term Word study: Base-form focus: serfdom is the dictionary headword; compare its inflected or derived forms in context.	a system binding agricultural laborers to an estate and its lord	Under serfdom, peasants owed labor and dues but were not normally sold apart from the land.
531	printing press	noun Study Field: Grade 9 world-history, civics, and geography term Word study: Term structure: printing + press. Study the complete expression as one field-specific unit.	a machine that reproduces text or images from an inked surface, greatly increasing publication speed	Movable type and the printing press lowered the cost of books in Europe.
532	Protestant Reformation	proper noun Study Field: Grade 9 world-history, civics, and geography term Word study: Term structure: Protestant + Reformation. Study the complete expression as one field-specific unit.	the sixteenth-century movement that challenged Western Christian institutions and produced new churches	The Protestant Reformation changed religious and political authority across Europe.
533	Counter-Reformation	proper noun Study Field: Grade 9 world-history, civics, and geography term Word study: Term structure: Counter + Reformation. Study the complete expression as one field-specific unit.	Catholic reform and response to Protestant movements during the sixteenth and seventeenth centuries	The Council of Trent shaped the Counter-Reformation.
534	scientific revolution	noun Study Field: Grade 9 world-history, civics, and geography term Word study: Term structure: scientific + revolution. Study the complete expression as one field-specific unit.	the early modern transformation in methods and explanations for studying the natural world	The scientific revolution emphasized mathematical models and repeatable observation.
535	heliocentric model	noun Study Field: Grade 9 world-history, civics, and geography term Word study: Term structure: heliocentric + model. Study the complete expression as one field-specific unit.	a model placing the Sun near the center of the planetary system	The heliocentric model explained retrograde motion more simply.
536	geocentric model	noun Study Field: Grade 9 world-history, civics, and geography term Word study: Term structure: geocentric + model. Study the complete expression as one field-specific unit.	a model placing Earth at the center of the universe or planetary system	The geocentric model dominated much European astronomy for centuries.
537	natural law	noun Study Field: Grade 9 world-history, civics, and geography term Word study: Term structure: natural + law. Study the complete expression as one field-specific unit.	the idea that universal principles of reason or morality can guide human law	Enlightenment writers used natural law to criticize arbitrary rule.
538	social contract	noun Study Field: Grade 9 world-history, civics, and geography term Word study: Term structure: social + contract. Study the complete expression as one field-specific unit.	the theory that political authority arises from an agreement among people to form government	The social contract requires government to protect rights in exchange for civic obedience.
539	consent of the governed	noun Study Field: Grade 9 world-history, civics, and geography term Word study: Term structure: consent + of + the + governed. Study the complete expression as one field-specific unit.	the principle that legitimate political authority depends on the people's approval	Regular elections are one expression of consent of the governed.
540	constitutionalism	noun Study Field: Grade 9 world-history, civics, and geography term Word study: Suffix focus: -ism often names a belief, system, movement, or practice.	the principle that government power must be defined and limited by higher law	Constitutionalism rejects the idea that rulers may govern without legal restraint.
541	Age of Exploration	proper noun Study Field: Grade 9 world-history, civics, and geography term Word study: Term structure: Age + of + Exploration. Study the complete expression as one field-specific unit.	the period of extensive European overseas travel and expansion beginning in the fifteenth century	During the Age of Exploration, voyages connected distant regions through trade and conquest.
542	circumnavigation	noun Study Field: Grade 9 world-history, civics, and geography term Word study: Suffix focus: -ation commonly forms a noun naming an action, process, or result.	travel completely around Earth or another geographic feature	The expedition completed the first recorded circumnavigation of the globe.
543	map projection analysis	noun Study Field: Grade 9 world-history, civics, and geography term Word study: Term structure: map + projection + analysis. Study the complete expression as one field-specific unit.	evaluation of how a flat map represents and distorts Earth's curved surface	Map projection analysis shows why Greenland appears unusually large on a Mercator map.
544	navigation	noun Study Field: Grade 9 world-history, civics, and geography term Word study: Suffix focus: -ation commonly forms a noun naming an action, process, or result.	the science and practice of determining position and planning travel routes	Improved navigation helped sailors cross open oceans.
545	imperial expansion	noun Study Field: Grade 9 world-history, civics, and geography term Word study: Term structure: imperial + expansion. Study the complete expression as one field-specific unit.	the extension of a state's political, military, or economic control over other territories	Imperial expansion displaced local rulers and redirected trade.
546	Atlantic slave trade	proper noun Study Field: Grade 9 world-history, civics, and geography term Word study: Term structure: Atlantic + slave + trade. Study the complete expression as one field-specific unit.	the forced trafficking of millions of Africans across the Atlantic within a system of racial slavery	The Atlantic slave trade caused immense suffering and reshaped societies on several continents.
547	industrial revolution	noun Study Field: Grade 9 world-history, civics, and geography term Word study: Term structure: industrial + revolution. Study the complete expression as one field-specific unit.	the transformation toward mechanized production, factories, and new energy sources	The industrial revolution moved much textile production from homes to factories.
548	factory system	noun Study Field: Grade 9 world-history, civics, and geography term Word study: Term structure: factory + system. Study the complete expression as one field-specific unit.	a production method that concentrates workers and machinery in one managed location	The factory system divided manufacturing into repeated specialized tasks.
549	mass production	noun Study Field: Grade 9 world-history, civics, and geography term Word study: Term structure: mass + production. Study the complete expression as one field-specific unit.	large-scale manufacture of standardized goods, often using assembly methods	Mass production reduced the price of many household items.
550	rapid urbanization	noun Study Field: Grade 9 world-history, civics, and geography term Word study: Term structure: rapid + urbanization. Study the complete expression as one field-specific unit.	fast growth in the share or number of people living in cities	Rapid urbanization created crowded housing near nineteenth-century factories.
551	labor movement	noun Study Field: Grade 9 world-history, civics, and geography term Word study: Term structure: labor + movement. Study the complete expression as one field-specific unit.	organized efforts by workers to improve wages, hours, rights, and conditions	The labor movement campaigned for safer factories and shorter workdays.
552	collective bargaining	noun Study Field: Grade 9 world-history, civics, and geography term Word study: Term structure: collective + bargaining. Study the complete expression as one field-specific unit.	negotiation between an employer and an organized group of workers	Through collective bargaining, the union and company agreed on wages.
553	laissez-faire	adjective Study Field: Grade 9 world-history, civics, and geography term Word study: Term structure: laissez + faire. Study the complete expression as one field-specific unit.	favoring minimal government interference in economic activity	Laissez-faire thinkers argued that markets function best with limited regulation.
554	class consciousness	noun Study Field: Grade 9 world-history, civics, and geography term Word study: Term structure: class + consciousness. Study the complete expression as one field-specific unit.	awareness of a social class's shared position and interests	Factory workers developed class consciousness through common working conditions.
555	national sovereignty	noun Study Field: Grade 9 world-history, civics, and geography term Word study: Term structure: national + sovereignty. Study the complete expression as one field-specific unit.	a state's authority to govern itself and control its territory	The treaty recognized the new country's national sovereignty.
556	legitimacy	noun Study Field: Grade 9 world-history, civics, and geography term Word study: Base-form focus: legitimacy is the dictionary headword; compare its inflected or derived forms in context.	accepted rightfulness of a ruler, institution, or political order	Free elections can strengthen a government's legitimacy.
557	balance of power	noun Study Field: Grade 9 world-history, civics, and geography term Word study: Term structure: balance + of + power. Study the complete expression as one field-specific unit.	a distribution of strength intended to prevent any one state from dominating others	Diplomats formed alliances to maintain a balance of power.
558	alliance system	noun Study Field: Grade 9 world-history, civics, and geography term Word study: Term structure: alliance + system. Study the complete expression as one field-specific unit.	a network of agreements in which states promise cooperation or defense	The alliance system turned a regional crisis into a wider war.
559	diplomatic negotiation	noun Study Field: Grade 9 world-history, civics, and geography term Word study: Term structure: diplomatic + negotiation. Study the complete expression as one field-specific unit.	formal discussion between states or representatives seeking agreement	Diplomatic negotiation produced a temporary border settlement.
560	militarization	noun Study Field: Grade 9 world-history, civics, and geography term Word study: Suffix focus: -ization forms a noun for a process of making or becoming.	the process of expanding military influence, preparation, or equipment	Militarization increased spending on armies and weapons before the conflict.

From Rome to Feudal Europe

Reading practice for pages 16–18. Five relevant words are highlighted.

English reading

During the Pax Romana, imperial roads and each major aqueduct connected distant communities, while Roman civil law influenced later legal traditions. Centuries afterward, political power in parts of Europe became organized through a feudal hierarchy. Under serfdom, many agricultural workers were bound by obligations to landowners rather than protected as equal citizens.

Reading comprehension

1. What connected Roman communities?

Roads and aqueducts connected Roman communities.

2. What Roman tradition influenced later law?

Roman civil law influenced later legal traditions.

3. How did serfdom restrict workers?

It bound many workers to landowners through obligations.

Page 17: words 561–595

Vocabulary page 17
#	Word	Details	Meaning	Sample sentence
561	mobilization	noun Study Field: Grade 9 world-history, civics, and geography term Word study: Suffix focus: -ization forms a noun for a process of making or becoming.	the organization of armed forces and national resources for war or emergency	Railways accelerated military mobilization.
562	total war	noun Study Field: Grade 9 world-history, civics, and geography term Word study: Term structure: total + war. Study the complete expression as one field-specific unit.	warfare that directs a society's economic and civilian resources toward military victory	During total war, governments rationed food and converted factories to weapons production.
563	trench warfare	noun Study Field: Grade 9 world-history, civics, and geography term Word study: Term structure: trench + warfare. Study the complete expression as one field-specific unit.	combat conducted from fortified ditches facing an opponent's positions	Trench warfare on the Western Front produced long stalemates and heavy casualties.
564	self-determination	noun Study Field: Grade 9 world-history, civics, and geography term Word study: Term structure: self + determination. Study the complete expression as one field-specific unit.	the principle that a people should choose its own political status and government	Nationalists appealed to self-determination after the empire collapsed.
565	collective security	noun Study Field: Grade 9 world-history, civics, and geography term Word study: Term structure: collective + security. Study the complete expression as one field-specific unit.	a system in which states agree to respond together against aggression	Collective security depends on members acting when another state is attacked.
566	League of Nations	proper noun Study Field: Grade 9 world-history, civics, and geography term Word study: Term structure: League + of + Nations. Study the complete expression as one field-specific unit.	the international organization created after World War I to promote cooperation and peace	The League of Nations lacked its own armed force.
567	Treaty of Versailles	proper noun Study Field: Grade 9 world-history, civics, and geography term Word study: Term structure: Treaty + of + Versailles. Study the complete expression as one field-specific unit.	the 1919 treaty that formally ended war between Germany and the Allied powers	The Treaty of Versailles imposed territorial losses and reparations on Germany.
568	Nazism	noun Study Field: Grade 9 world-history, civics, and geography term Word study: Capitalization focus: Nazism is conventionally capitalized as the name of a specific political ideology.	the racist, antisemitic, totalitarian ideology and movement led by Adolf Hitler in Germany	Nazism destroyed democratic institutions and pursued genocidal policies.
569	Holocaust	proper noun Study Field: Grade 9 world-history, civics, and geography term Word study: Capitalization focus: this is a proper name, so its standard written form begins with a capital letter.	the systematic persecution and murder of six million Jews and millions of other victims by Nazi Germany and its collaborators	Holocaust remembrance preserves evidence and honors the people who were murdered.
570	Axis Powers	proper noun Study Field: Grade 9 world-history, civics, and geography term Word study: Term structure: Axis + Powers. Study the complete expression as one field-specific unit.	the alliance led by Germany, Italy, and Japan during World War II	The Axis Powers pursued expansion across Europe, Africa, and Asia.
571	Allied Powers	proper noun Study Field: Grade 9 world-history, civics, and geography term Word study: Term structure: Allied + Powers. Study the complete expression as one field-specific unit.	the coalition opposing the Axis powers during World War II	The Allied Powers coordinated military campaigns despite differing political systems.
572	appeasement policy	noun Study Field: Grade 9 world-history, civics, and geography term Word study: Term structure: appeasement + policy. Study the complete expression as one field-specific unit.	a strategy of granting concessions to an aggressive state in hopes of avoiding conflict	The appeasement policy failed to stop further territorial demands.
573	Cold War	proper noun Study Field: Grade 9 world-history, civics, and geography term Word study: Term structure: Cold + War. Study the complete expression as one field-specific unit.	the prolonged geopolitical rivalry after World War II led by the United States and Soviet Union	The Cold War involved ideological competition, proxy conflicts, and nuclear tension.
574	containment policy	noun Study Field: Grade 9 world-history, civics, and geography term Word study: Term structure: containment + policy. Study the complete expression as one field-specific unit.	a strategy intended to prevent the spread of an opposing state's influence or ideology	The United States adopted containment policy toward Soviet influence.
575	proxy war	noun Study Field: Grade 9 world-history, civics, and geography term Word study: Term structure: proxy + war. Study the complete expression as one field-specific unit.	a conflict in which outside powers support opposing local sides rather than fight each other directly	The regional civil war became a proxy war when rival powers supplied weapons.
576	arms race	noun Study Field: Grade 9 world-history, civics, and geography term Word study: Term structure: arms + race. Study the complete expression as one field-specific unit.	competition between states to build more or stronger weapons	The nuclear arms race produced enormous arsenals.
577	nuclear deterrence	noun Study Field: Grade 9 world-history, civics, and geography term Word study: Term structure: nuclear + deterrence. Study the complete expression as one field-specific unit.	the strategy of discouraging attack through the threat of devastating nuclear retaliation	Nuclear deterrence depends on an opponent believing retaliation is possible.
578	decolonization	noun Study Field: Grade 9 world-history, civics, and geography term Word study: Suffix focus: -ization forms a noun for a process of making or becoming.	the process through which colonies gain independence from imperial rule	Decolonization created many new states after World War II.
579	nonaligned movement	noun Study Field: Grade 9 world-history, civics, and geography term Word study: Term structure: nonaligned + movement. Study the complete expression as one field-specific unit.	a group of states that sought independence from the major Cold War power blocs	The nonaligned movement promoted sovereignty and anti-colonial cooperation.
580	United Nations	proper noun Study Field: Grade 9 world-history, civics, and geography term Word study: Term structure: United + Nations. Study the complete expression as one field-specific unit.	the international organization founded in 1945 to support peace, cooperation, development, and human rights	The United Nations coordinates humanitarian relief through specialized agencies.
581	Universal Declaration of Human Rights	proper noun Study Field: Grade 9 world-history, civics, and geography term Word study: Term structure: Universal + Declaration + of + Human + Rights. Study the complete expression as one field-specific unit.	the 1948 international statement recognizing fundamental rights and freedoms for all people	The Universal Declaration of Human Rights includes freedom of thought and equal protection.
582	human rights	noun Study Field: Grade 9 world-history, civics, and geography term Word study: Term structure: human + rights. Study the complete expression as one field-specific unit.	basic freedoms and protections regarded as belonging to every person	Freedom from torture is a human rights principle.
583	civil society	noun Study Field: Grade 9 world-history, civics, and geography term Word study: Term structure: civil + society. Study the complete expression as one field-specific unit.	organizations and relationships outside government and business through which people pursue shared interests	Independent charities and community groups are part of civil society.
584	political legitimacy	noun Study Field: Grade 9 world-history, civics, and geography term Word study: Term structure: political + legitimacy. Study the complete expression as one field-specific unit.	public acceptance that political authority is rightful and may govern	Transparent procedures can increase political legitimacy.
585	nation-state	noun Study Field: Grade 9 world-history, civics, and geography term Word study: Term structure: nation + state. Study the complete expression as one field-specific unit.	a sovereign state identified strongly with a particular national community	A nation-state may still contain several languages and cultural groups.
586	border dispute	noun Study Field: Grade 9 world-history, civics, and geography term Word study: Term structure: border + dispute. Study the complete expression as one field-specific unit.	a disagreement between states or regions about the location or control of a boundary	The two governments submitted the border dispute to arbitration.
587	cultural landscape	noun Study Field: Grade 9 world-history, civics, and geography term Word study: Term structure: cultural + landscape. Study the complete expression as one field-specific unit.	a place shaped by the interaction of people, culture, and the physical environment	Terraced fields form a cultural landscape created over generations.
588	push factor	noun Study Field: Grade 9 world-history, civics, and geography term Word study: Term structure: push + factor. Study the complete expression as one field-specific unit.	a condition that encourages people to leave a place	Armed conflict is a powerful push factor in migration.
589	pull factor	noun Study Field: Grade 9 world-history, civics, and geography term Word study: Term structure: pull + factor. Study the complete expression as one field-specific unit.	a condition that attracts people toward a place	Available jobs can be a pull factor for migration.
590	demographic transition	noun Study Field: Grade 9 world-history, civics, and geography term Word study: Term structure: demographic + transition. Study the complete expression as one field-specific unit.	the shift from high birth and death rates to lower rates as a society changes	During demographic transition, death rates often fall before birth rates.
591	human-environment interaction	noun Study Field: Grade 9 world-history, civics, and geography term Word study: Term structure: human + environment + interaction. Study the complete expression as one field-specific unit.	the ways people depend on, adapt to, and alter the natural environment	Irrigation is a human-environment interaction that can support farming and increase soil salinity.
592	population pyramid	noun Study Field: Grade 9 world-history, civics, and geography term Word study: Term structure: population + pyramid. Study the complete expression as one field-specific unit.	a graph showing a population's age and sex structure	A wide base on a population pyramid indicates many young people.
593	dependency ratio	noun Study Field: Grade 9 world-history, civics, and geography term Word study: Term structure: dependency + ratio. Study the complete expression as one field-specific unit.	the number of younger and older dependents relative to the working-age population	An aging population can raise the dependency ratio.
594	urban sprawl	noun Study Field: Grade 9 world-history, civics, and geography term Word study: Term structure: urban + sprawl. Study the complete expression as one field-specific unit.	low-density development spreading outward from a city	Urban sprawl can increase car travel and habitat loss.
595	megacity	noun Study Field: Grade 9 world-history, civics, and geography term Word study: Suffix focus: -ity commonly forms a noun naming a quality, state, or condition.	an urban area with more than ten million residents	A megacity requires extensive transportation and water systems.

Page 18: words 596–630

Vocabulary page 18
#	Word	Details	Meaning	Sample sentence
596	sustainable development	noun Study Field: Grade 9 world-history, civics, and geography term Word study: Term structure: sustainable + development. Study the complete expression as one field-specific unit.	development that meets present needs without undermining future generations' ability to meet theirs	Sustainable development balances economic opportunity, social well-being, and environmental limits.
597	resource distribution	noun Study Field: Grade 9 world-history, civics, and geography term Word study: Term structure: resource + distribution. Study the complete expression as one field-specific unit.	the geographic pattern in which useful natural or economic resources are located	Uneven resource distribution influences trade and political relationships.
598	geopolitical	adjective Study Field: Grade 9 world-history, civics, and geography term Word study: Base-form focus: geopolitical is the dictionary headword; compare its inflected or derived forms in context.	relating to how geography affects international power and policy	Control of the narrow strait has geopolitical importance.
599	economic interdependence	noun Study Field: Grade 9 world-history, civics, and geography term Word study: Term structure: economic + interdependence. Study the complete expression as one field-specific unit.	mutual reliance among economies for goods, services, investment, or markets	Economic interdependence means a supply disruption in one country can affect many others.
600	global governance	noun Study Field: Grade 9 world-history, civics, and geography term Word study: Term structure: global + governance. Study the complete expression as one field-specific unit.	cooperation through international rules, institutions, and networks on issues crossing borders	Climate agreements are one form of global governance.
601	accumulation	noun Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ation commonly forms a noun naming an action, process, or result.	gradual gathering or increase over time	The accumulation of sediment narrowed the channel.
602	adaptability	noun Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ability forms a noun for the capacity to have a quality or perform an action.	the ability to change effectively when conditions or needs change	The team's adaptability helped it continue after the venue closed.
603	recalibration	noun Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ation commonly forms a noun naming an action, process, or result.	the process of checking and adjusting a measure, plan, or judgment to improve accuracy	The unusual readings prompted recalibration of the air-quality sensor.
604	allocation	noun Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ation commonly forms a noun naming an action, process, or result.	the act of assigning limited resources to particular uses or recipients	The budget increases the allocation for library materials.
605	estimation error	noun Study Field: Grade 9 precise high-utility word Word study: Term structure: estimation + error. Study the complete expression as one field-specific unit.	the difference between an estimated value and the actual or accepted value	A larger sample reduced the survey's estimation error.
606	assembly	noun Study Field: Grade 9 precise high-utility word Word study: Base-form focus: assembly is the dictionary headword; compare its inflected or derived forms in context.	the act of joining parts together or a group gathered for a purpose	Final assembly of the bicycle occurs after the frame is painted.
607	attainment	noun Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ment commonly forms a noun for an action, process, state, or result.	the achievement of a goal, skill, or level	Graduation marks the attainment of the program's requirements.
608	capability	noun Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ity commonly forms a noun naming a quality, state, or condition.	the power, skill, or capacity to perform a task	The satellite has the capability to measure sea-surface temperature.
609	cessation	noun Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ation commonly forms a noun naming an action, process, or result.	the ending or stopping of an activity or process	The cessation of rainfall allowed the river level to fall.
610	clarification	noun Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ation commonly forms a noun naming an action, process, or result.	an explanation or change that makes something easier to understand	The editor requested clarification of the phrase “regular use.”
611	coincidence	noun Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ence commonly forms a noun naming an action, quality, or state.	an unexpected occurrence of events together without a demonstrated causal connection	The two alarms sounding together may be a coincidence.
612	compatibility	noun Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ibility forms a noun for the capacity to have a quality or perform an action.	the ability of things or people to work together without conflict	The technician checked the software's compatibility with older devices.
613	compensation	noun Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ation commonly forms a noun naming an action, process, or result.	payment or another benefit given for work, loss, injury, or imbalance	Residents received compensation for property damaged by the construction.
614	complexity	noun Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ity commonly forms a noun naming a quality, state, or condition.	the condition of having many connected parts or difficult relationships	The ecosystem's complexity makes a single-cause explanation unlikely.
615	conformity	noun Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ity commonly forms a noun naming a quality, state, or condition.	behavior or form that matches a rule, standard, or group expectation	The inspector tested the product for conformity with safety standards.
616	contradiction	noun Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -tion commonly forms a noun naming an action, process, or result.	a statement, fact, or condition that conflicts with another	There is a contradiction between the witness's timeline and the video.
617	public controversy	noun Study Field: Grade 9 precise high-utility word Word study: Term structure: public + controversy. Study the complete expression as one field-specific unit.	an extended open disagreement about an issue of broad concern	The dam project caused public controversy over jobs and habitat loss.
618	coordination	noun Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ation commonly forms a noun naming an action, process, or result.	the organization of people or parts so they work effectively together	Emergency coordination prevented two rescue teams from searching the same area.
619	correspondence	noun Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ence commonly forms a noun naming an action, quality, or state.	a close relationship or exchange of written messages	The map shows a correspondence between high elevation and cooler temperature.
620	deficiency	noun Study Field: Grade 9 precise high-utility word Word study: Base-form focus: deficiency is the dictionary headword; compare its inflected or derived forms in context.	a shortage or weakness that prevents a requirement from being met	An iron deficiency can reduce the blood's ability to carry oxygen.
621	dependency	noun Study Field: Grade 9 precise high-utility word Word study: Base-form focus: dependency is the dictionary headword; compare its inflected or derived forms in context.	a condition of relying on something or someone for support or operation	The island's fuel dependency makes price shocks especially serious.
622	detection	noun Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -tion commonly forms a noun naming an action, process, or result.	the act of discovering or noticing something that is not immediately obvious	Early detection improves the chance of controlling the invasive insect.
623	deviation	noun Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ation commonly forms a noun naming an action, process, or result.	a departure from an expected path, value, rule, or pattern	The sharp deviation from the average led researchers to check the instrument.
624	diversification	noun Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ation commonly forms a noun naming an action, process, or result.	the process of adding variety to reduce risk or expand possibilities	Crop diversification protects farmers if one harvest fails.
625	dominance	noun Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ance commonly forms a noun naming an action, quality, or state.	the condition of having the greatest influence, control, or prominence	The company's market dominance discouraged new competitors.
626	effectiveness	noun Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ness forms a noun naming a quality or state.	the degree to which an action achieves its intended result	The trial measures the effectiveness of the new filtration method.
627	emergence	noun Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ence commonly forms a noun naming an action, quality, or state.	the process of coming into existence, view, or importance	The emergence of inexpensive printing changed public access to information.
628	emphasis	noun Study Field: Grade 9 precise high-utility word Word study: Base-form focus: emphasis is the dictionary headword; compare its inflected or derived forms in context.	special importance or attention given to something	The course places emphasis on evidence rather than memorized dates.
629	enforcement	noun Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ment commonly forms a noun for an action, process, state, or result.	the act of making sure that a law, rule, or agreement is obeyed	Weak enforcement allowed factories to ignore the pollution limit.
630	enhancement	noun Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ment commonly forms a noun for an action, process, state, or result.	an improvement that increases value, quality, or performance	Noise reduction produced a clear enhancement in the recording.

Page 19: words 631–665

Vocabulary page 19
#	Word	Details	Meaning	Sample sentence
631	equivalence	noun Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ence commonly forms a noun naming an action, quality, or state.	the condition of having equal meaning, value, function, or effect	The translator questioned the equivalence of the two legal terms.
632	exclusion	noun Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -sion commonly forms a noun naming an action, process, or result.	the act or condition of keeping someone or something out	The exclusion of rural households distorted the survey.
633	expansion	noun Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -sion commonly forms a noun naming an action, process, or result.	an increase in size, range, amount, or influence	Railway expansion connected inland farms with coastal ports.
634	exploitation	noun Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ation commonly forms a noun naming an action, process, or result.	unfair or excessive use of people or resources for advantage	Labor laws were introduced to reduce the exploitation of children.
635	responsiveness	noun Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ness forms a noun naming a quality or state.	the ability or willingness to react appropriately and promptly	The agency's responsiveness improved after it opened a public hotline.
636	inclusivity	noun Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ity commonly forms a noun naming a quality, state, or condition.	the practice or quality of welcoming participation across differences	Providing captions improves the meeting's inclusivity.
637	inevitability	noun Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ability forms a noun for the capacity to have a quality or perform an action.	the condition of being certain to happen or impossible to avoid	The author challenges the supposed inevitability of the war.
638	modernization	noun Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ization forms a noun for a process of making or becoming.	the process of updating systems, technology, or institutions	Railway modernization shortened travel times and improved safety.
639	inspection	noun Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -tion commonly forms a noun naming an action, process, or result.	careful official or technical examination	A bridge inspection found corrosion beneath the road surface.
640	interaction	noun Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -tion commonly forms a noun naming an action, process, or result.	an action or influence occurring between two or more people, forces, or systems	The medication can cause a harmful interaction with grapefruit.
641	isolation	noun Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ation commonly forms a noun naming an action, process, or result.	the condition of being separated from others or from outside contact	Geographic isolation allowed the island species to develop independently.
642	justification	noun Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ation commonly forms a noun naming an action, process, or result.	a reason or body of evidence showing why a decision or belief is reasonable	The report gives no justification for excluding the smaller schools.
643	maintenance	noun Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ance commonly forms a noun naming an action, quality, or state.	work that keeps something safe and functioning	Routine maintenance prevented the machine from overheating.
644	manipulation	noun Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ation commonly forms a noun naming an action, process, or result.	skillful control or unfair influence over something or someone	Selective cropping can become manipulation when it changes a photograph's apparent meaning.
645	modification	noun Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ation commonly forms a noun naming an action, process, or result.	a change made to improve, adapt, or alter something	The wheelchair ramp required a modification to the entrance.
646	negotiation	noun Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ation commonly forms a noun naming an action, process, or result.	discussion intended to reach agreement among parties with different interests	Negotiation ended the strike with a revised contract.
647	spatial orientation	noun Study Field: Grade 9 precise high-utility word Word study: Term structure: spatial + orientation. Study the complete expression as one field-specific unit.	awareness of position and direction within a physical space	The map improved hikers' spatial orientation in the fog.
648	participation	noun Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ation commonly forms a noun naming an action, process, or result.	the act of taking part in an activity, process, or decision	Online access increased participation in the public hearing.
649	perception	noun Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -tion commonly forms a noun naming an action, process, or result.	the way something is noticed, understood, or interpreted	Lighting can change the perception of a room's size.
650	continuance	noun Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ance commonly forms a noun naming an action, quality, or state.	the state or act of remaining in operation or existence	Funding is necessary for the continuance of the research program.
651	prevention	noun Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -tion commonly forms a noun naming an action, process, or result.	action taken to stop a harmful event or condition before it occurs	Vaccination is an important form of disease prevention.
652	priority	noun Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ity commonly forms a noun naming a quality, state, or condition.	something treated as more important or urgent than other matters	Restoring clean water became the city's first priority.
653	prohibition	noun Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ition commonly forms a noun naming an action, process, or result.	an official rule or law that forbids something	The park has a prohibition against feeding wild animals.
654	promotion	noun Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -tion commonly forms a noun naming an action, process, or result.	support intended to increase awareness, use, status, or sales	The campaign focuses on the promotion of bicycle safety.
655	proportionality	noun Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ity commonly forms a noun naming a quality, state, or condition.	the quality of having a consistent ratio or an appropriate relation in size or degree	The court considered whether the penalty had proportionality to the offense.
656	proximity	noun Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ity commonly forms a noun naming a quality, state, or condition.	nearness in space, time, or relationship	The garden's proximity to the river makes flooding possible.
657	pursuit	noun Study Field: Grade 9 precise high-utility word Word study: Base-form focus: pursuit is the dictionary headword; compare its inflected or derived forms in context.	the act of seeking, following, or working toward something	Her pursuit of accuracy led her back to the original records.
658	response rate	noun Study Field: Grade 9 precise high-utility word Word study: Term structure: response + rate. Study the complete expression as one field-specific unit.	the percentage of invited people or units that provide usable responses	Reminder messages increased the survey's response rate.
659	recovery	noun Study Field: Grade 9 precise high-utility word Word study: Base-form focus: recovery is the dictionary headword; compare its inflected or derived forms in context.	a return toward a normal, healthy, or successful condition	Wetland recovery began after grazing ended.
660	governance	noun Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ance commonly forms a noun naming an action, quality, or state.	the systems and processes through which an organization or society makes and applies decisions	Transparent governance includes public access to budgets and rules.
661	reinforcement	noun Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ment commonly forms a noun for an action, process, state, or result.	an action or material that strengthens a structure, behavior, or idea	Steel reinforcement helps concrete resist tension.
662	restriction	noun Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -tion commonly forms a noun naming an action, process, or result.	a rule or condition that limits action, access, or amount	A seasonal restriction protects nesting birds from disturbance.
663	retention	noun Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -tion commonly forms a noun naming an action, process, or result.	the act or ability of keeping, holding, or remembering something	Tree roots improve soil retention on the slope.
664	revelation	noun Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ation commonly forms a noun naming an action, process, or result.	a surprising fact made known or the act of revealing it	The diary's revelation changed how historians understood the expedition.
665	significance	noun Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ance commonly forms a noun naming an action, quality, or state.	importance, meaning, or the likelihood that a result reflects more than chance	The essay explains the significance of the broken watch in the final scene.

Evaluating a Public Policy

Reading practice for pages 19–21. Five relevant words are highlighted.

English reading

A city proposes an expansion of late-night bus service. Advocates argue that equal fares create equivalence across routes, but residents warn that geographic exclusion will persist if some neighborhoods remain unserved. Officials must prevent the exploitation of drivers through unsafe schedules and demonstrate responsiveness by revising the plan after public testimony.

Reading comprehension

1. What service expansion is proposed?

The city proposes expanded late-night bus service.

2. What exclusion concerns residents?

They worry that some neighborhoods will remain unserved.

3. How can officials show responsiveness?

They can revise the plan after public testimony.

Page 20: words 666–700

Vocabulary page 20
#	Word	Details	Meaning	Sample sentence
666	stability	noun Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ity commonly forms a noun naming a quality, state, or condition.	the ability to remain steady or return to balance after change	A wide base improves the tower's stability.
667	sufficiency	noun Study Field: Grade 9 precise high-utility word Word study: Base-form focus: sufficiency is the dictionary headword; compare its inflected or derived forms in context.	the condition of having enough for a need or purpose	Auditors examined the sufficiency of evidence supporting the expense.
668	long-term viability	noun Study Field: Grade 9 precise high-utility word Word study: Term structure: long + term + viability. Study the complete expression as one field-specific unit.	the ability to remain successful or functional over an extended period	Reliable water access is essential to the town's long-term viability.
669	information transfer	noun Study Field: Grade 9 precise high-utility word Word study: Term structure: information + transfer. Study the complete expression as one field-specific unit.	the movement of data, knowledge, or signals between people, cells, or systems	Fiber-optic cables allow rapid information transfer.
670	utilization	noun Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ization forms a noun for a process of making or becoming.	the act or rate of putting something to practical use	The clinic tracked utilization of its evening services.
671	constitutional amendment	noun Study Field: Grade 9 precise high-utility word Word study: Term structure: constitutional + amendment. Study the complete expression as one field-specific unit.	a formal change or addition to a constitution	The constitutional amendment extended voting rights.
672	beneficiary	noun Study Field: Grade 9 precise high-utility word Word study: Base-form focus: beneficiary is the dictionary headword; compare its inflected or derived forms in context.	a person or group that receives an advantage, payment, or protection	Each scholarship beneficiary receives tuition and mentoring.
673	compliance	noun Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ance commonly forms a noun naming an action, quality, or state.	the act of meeting a rule, request, or standard	The audit confirmed compliance with workplace safety law.
674	consultation	noun Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ation commonly forms a noun naming an action, process, or result.	a meeting or process of seeking advice and considering views before acting	The council held a public consultation before changing the bus route.
675	deliberation	noun Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ation commonly forms a noun naming an action, process, or result.	careful discussion and consideration before a decision	After two days of deliberation, the jury reached a verdict.
676	designation	noun Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ation commonly forms a noun naming an action, process, or result.	an official name, status, or assignment	The area's designation as a marine reserve limits fishing.
677	disclosure	noun Study Field: Grade 9 precise high-utility word Word study: Base-form focus: disclosure is the dictionary headword; compare its inflected or derived forms in context.	the act of making relevant information known	Financial disclosure reveals whether an official has related business interests.
678	professional discretion	noun Study Field: Grade 9 precise high-utility word Word study: Term structure: professional + discretion. Study the complete expression as one field-specific unit.	careful freedom to make judgments within the standards of a profession	A physician uses professional discretion when adapting general guidance to a patient's needs.
679	eligibility	noun Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ibility forms a noun for the capacity to have a quality or perform an action.	the condition of meeting stated requirements	Applicants must prove eligibility for the reduced fee.
680	exemption	noun Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -tion commonly forms a noun naming an action, process, or result.	official freedom from a rule, duty, or requirement	The law grants an exemption for emergency vehicles.
681	feasibility	noun Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ibility forms a noun for the capacity to have a quality or perform an action.	the degree to which a plan can be successfully carried out	The pilot program tests the feasibility of electric buses on steep routes.
682	legal jurisdiction	noun Study Field: Grade 9 precise high-utility word Word study: Term structure: legal + jurisdiction. Study the complete expression as one field-specific unit.	the authority of a court or government to make decisions over a place, person, or issue	The dispute concerns which court has legal jurisdiction.
683	liability	noun Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ity commonly forms a noun naming a quality, state, or condition.	legal responsibility for harm, debt, or obligation	The company accepted liability for the defective product.
684	oversight	noun Study Field: Grade 9 precise high-utility word Word study: Base-form focus: oversight is the dictionary headword; compare its inflected or derived forms in context.	supervision intended to ensure lawful, safe, or effective performance	Independent oversight found weaknesses in the purchasing process.
685	precedence	noun Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ence commonly forms a noun naming an action, quality, or state.	greater importance or priority in order or decision-making	During an evacuation, human safety takes precedence over property protection.
686	operating procedure	noun Study Field: Grade 9 precise high-utility word Word study: Term structure: operating + procedure. Study the complete expression as one field-specific unit.	an established sequence of steps for performing a task safely and consistently	The operating procedure requires two checks before the valve opens.
687	procurement	noun Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ment commonly forms a noun for an action, process, state, or result.	the organized process of obtaining goods or services	Public procurement rules require fair competition among suppliers.
688	provision	noun Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -sion commonly forms a noun naming an action, process, or result.	a clause in a law or agreement, or an arrangement supplying what is needed	One provision of the contract requires monthly safety reports.
689	recommendation	noun Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ation commonly forms a noun naming an action, process, or result.	an advised course of action based on judgment or evidence	The panel's recommendation is to repair rather than replace the bridge.
690	requirement	noun Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ment commonly forms a noun for an action, process, state, or result.	something that must be done, provided, or satisfied	A laboratory report is a graduation requirement.
691	technical specification	noun Study Field: Grade 9 precise high-utility word Word study: Term structure: technical + specification. Study the complete expression as one field-specific unit.	a precise written description of a product's required materials, dimensions, or performance	The battery failed to meet the technical specification for cold weather.
692	standardization	noun Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ization forms a noun for a process of making or becoming.	the process of making methods or products follow a common standard	Measurement standardization allows laboratories to compare results.
693	transparency	noun Study Field: Grade 9 precise high-utility word Word study: Base-form focus: transparency is the dictionary headword; compare its inflected or derived forms in context.	openness that makes decisions, evidence, and actions visible and understandable	Publishing meeting records increases government transparency.
694	implementation	noun Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ation commonly forms a noun naming an action, process, or result.	the process of putting a plan, rule, or system into effect	Training began before implementation of the new safety policy.
695	policy initiative	noun Study Field: Grade 9 precise high-utility word Word study: Term structure: policy + initiative. Study the complete expression as one field-specific unit.	an organized government or institutional effort to address a defined issue	The housing policy initiative funds repairs to vacant buildings.
696	institutionalization	noun Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ization forms a noun for a process of making or becoming.	the process of making a practice an established part of an organization or system	Institutionalization of annual audits made financial review routine.
697	authorization	noun Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ization forms a noun for a process of making or becoming.	official permission or power to act	Workers need written authorization to enter the restricted area.
698	identity verification	noun Study Field: Grade 9 precise high-utility word Word study: Term structure: identity + verification. Study the complete expression as one field-specific unit.	the process of confirming that a person or account is who it claims to be	The bank uses identity verification before changing account details.
699	mediation	noun Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ation commonly forms a noun naming an action, process, or result.	a process in which a neutral person helps disputing parties seek agreement	Mediation helped the neighbors settle the boundary dispute.
700	reconciliation	noun Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ation commonly forms a noun naming an action, process, or result.	the restoration of cooperation after conflict or the process of making records agree	The commission supported reconciliation by documenting abuses and hearing survivors.

Page 21: words 701–735

Vocabulary page 21
#	Word	Details	Meaning	Sample sentence
701	accessible	adjective Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ible means capable of, suitable for, or able to be affected.	able to be reached, entered, used, or understood	The museum provides an accessible entrance and captions for its videos.
702	accountable	adjective Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -able means capable of, suitable for, or worthy of an action.	required to explain actions and accept responsibility for results	Elected officials are accountable to the public.
703	context-sensitive	adjective Study Field: Grade 9 precise high-utility word Word study: Term structure: context + sensitive. Study the complete expression as one field-specific unit.	changing appropriately according to the surrounding situation or information	The translation tool is context-sensitive and distinguishes bank as land from bank as an institution.
704	administrative	adjective Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ive commonly forms an adjective meaning having a quality or tendency.	relating to the management and organization of an institution	The principal assigned the scheduling issue to administrative staff.
705	advisory	adjective Study Field: Grade 9 precise high-utility word Word study: Base-form focus: advisory is the dictionary headword; compare its inflected or derived forms in context.	providing guidance rather than issuing a binding command	The weather agency issued an advisory notice about dangerous heat.
706	aggregated	adjective Study Field: Grade 9 precise high-utility word Word study: Base-form focus: aggregated is the dictionary headword; compare its inflected or derived forms in context.	collected and combined into a total or larger group	The report protects privacy by publishing only aggregated data.
707	substitutable	adjective Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -able means capable of, suitable for, or worthy of an action.	capable of being replaced by something serving the same function	The two components are not substitutable because they require different voltages.
708	estimated	adjective Study Field: Grade 9 precise high-utility word Word study: Base-form focus: estimated is the dictionary headword; compare its inflected or derived forms in context.	calculated approximately from available information	The estimated repair cost may change after workers open the wall.
709	authoritative	adjective Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ive commonly forms an adjective meaning having a quality or tendency.	reliable and well supported because of recognized knowledge or official status	The archive's catalog is an authoritative source for the manuscript's history.
710	advantageous	adjective Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ous commonly forms an adjective meaning full of or characterized by.	creating a favorable condition or useful benefit	The sheltered harbor is advantageous for ships during storms.
711	serviceable	adjective Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -able means capable of, suitable for, or worthy of an action.	usable and capable of performing its intended function	Although scratched, the old microscope remains serviceable.
712	collaborative	adjective Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ive commonly forms an adjective meaning having a quality or tendency.	involving people working together toward a shared result	The collaborative project combines local knowledge with satellite data.
713	compatible	adjective Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ible means capable of, suitable for, or able to be affected.	able to exist or work together without conflict	The replacement part is compatible with the original machine.
714	consecutive	adjective Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ive commonly forms an adjective meaning having a quality or tendency.	following one after another without interruption	The river exceeded flood level for three consecutive days.
715	constructive	adjective Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ive commonly forms an adjective meaning having a quality or tendency.	useful and intended to improve a situation	The reviewer offered constructive criticism with specific revision ideas.
716	controversial	adjective Study Field: Grade 9 precise high-utility word Word study: Base-form focus: controversial is the dictionary headword; compare its inflected or derived forms in context.	causing strong public disagreement	The controversial proposal would relocate several families.
717	mutually supportive	adjective Study Field: Grade 9 precise high-utility word Word study: Term structure: mutually + supportive. Study the complete expression as one field-specific unit.	providing reciprocal help or benefit	The two programs are mutually supportive because one trains workers and the other creates jobs.
718	deficient	adjective Study Field: Grade 9 precise high-utility word Word study: Base-form focus: deficient is the dictionary headword; compare its inflected or derived forms in context.	lacking a necessary amount, quality, or feature	The diet was deficient in vitamin C.
719	characteristic	adjective Study Field: Grade 9 precise high-utility word Word study: Base-form focus: characteristic is the dictionary headword; compare its inflected or derived forms in context.	typical of a particular person, group, or thing	Dark volcanic soil is characteristic of the island.
720	detectable	adjective Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -able means capable of, suitable for, or worthy of an action.	able to be discovered, measured, or noticed	The chemical is detectable in water at very low concentrations.
721	developmental	adjective Study Field: Grade 9 precise high-utility word Word study: Base-form focus: developmental is the dictionary headword; compare its inflected or derived forms in context.	relating to growth or change across stages	The study examines developmental differences between early and late adolescence.
722	pluralistic	adjective Study Field: Grade 9 precise high-utility word Word study: Base-form focus: pluralistic is the dictionary headword; compare its inflected or derived forms in context.	including and respecting several groups, beliefs, or forms	A pluralistic society allows different religious communities to participate in public life.
723	effective	adjective Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ive commonly forms an adjective meaning having a quality or tendency.	successful in producing the intended result	The new filter is effective at removing lead.
724	emergent	adjective Study Field: Grade 9 precise high-utility word Word study: Base-form focus: emergent is the dictionary headword; compare its inflected or derived forms in context.	newly appearing or arising from interactions among parts	Traffic patterns are an emergent result of many individual driving decisions.
725	emphatic	adjective Study Field: Grade 9 precise high-utility word Word study: Base-form focus: emphatic is the dictionary headword; compare its inflected or derived forms in context.	expressed with forceful clarity or strong stress	Her emphatic refusal left no doubt about her position.
726	enforceable	adjective Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -able means capable of, suitable for, or worthy of an action.	capable of being required or upheld through law or authority	A vague promise may not be enforceable as a contract.
727	exclusive	adjective Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ive commonly forms an adjective meaning having a quality or tendency.	limited to particular people, uses, or categories	The interview contains exclusive information not reported elsewhere.
728	explanatory	adjective Study Field: Grade 9 precise high-utility word Word study: Base-form focus: explanatory is the dictionary headword; compare its inflected or derived forms in context.	intended or able to make causes, processes, or meanings clear	An explanatory caption describes how the machine works.
729	exploitative	adjective Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ive commonly forms an adjective meaning having a quality or tendency.	using people or resources unfairly for advantage	The investigation exposed exploitative labor conditions.
730	adjustable	adjective Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -able means capable of, suitable for, or worthy of an action.	capable of being changed to suit different needs or conditions	The desk has an adjustable height.
731	inclusive	adjective Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ive commonly forms an adjective meaning having a quality or tendency.	designed to welcome or consider people across differences	The inclusive survey provides several ways to respond.
732	inescapable	adjective Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -able means capable of, suitable for, or worthy of an action.	impossible to avoid or ignore	The financial cost is an inescapable part of the decision.
733	innovative	adjective Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ive commonly forms an adjective meaning having a quality or tendency.	introducing an effective new method, idea, or design	The innovative roof collects rainwater and cools the building.
734	institutional	adjective Study Field: Grade 9 precise high-utility word Word study: Base-form focus: institutional is the dictionary headword; compare its inflected or derived forms in context.	relating to an established organization or social system	Institutional rules can continue even after individual leaders change.
735	interactive	adjective Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ive commonly forms an adjective meaning having a quality or tendency.	allowing two-way action, response, or influence	The interactive map displays new information when a region is selected.

Page 22: words 736–770

Vocabulary page 22
#	Word	Details	Meaning	Sample sentence
736	justifiable	adjective Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -able means capable of, suitable for, or worthy of an action.	capable of being supported by sound reasons or evidence	Temporary closure is justifiable when the bridge is unsafe.
737	legislative	adjective Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ive commonly forms an adjective meaning having a quality or tendency.	relating to the making of laws or a lawmaking body	The bill entered the legislative process.
738	manipulative	adjective Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ive commonly forms an adjective meaning having a quality or tendency.	designed to control another person's choices unfairly or deceptively	The manipulative advertisement hides important fees until checkout.
739	measurable	adjective Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -able means capable of, suitable for, or worthy of an action.	capable of being expressed or evaluated through observation or quantity	The program set a measurable goal of reducing waste by ten percent.
740	negotiable	adjective Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -able means capable of, suitable for, or worthy of an action.	open to discussion and possible change through agreement	The delivery date is negotiable, but the safety standard is not.
741	operational	adjective Study Field: Grade 9 precise high-utility word Word study: Base-form focus: operational is the dictionary headword; compare its inflected or derived forms in context.	ready for use or relating to the practical functioning of a system	The repaired water pump is operational again.
742	organizational	adjective Study Field: Grade 9 precise high-utility word Word study: Base-form focus: organizational is the dictionary headword; compare its inflected or derived forms in context.	relating to how a group is structured and managed	Clear organizational roles reduced duplicated work.
743	perceptible	adjective Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ible means capable of, suitable for, or able to be affected.	noticeable or able to be sensed	A perceptible vibration began before the machine stopped.
744	preventive	adjective Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ive commonly forms an adjective meaning having a quality or tendency.	intended to stop a problem before it occurs	Preventive maintenance replaced the worn cable before it failed.
745	proximate	adjective Study Field: Grade 9 precise high-utility word Word study: Base-form focus: proximate is the dictionary headword; compare its inflected or derived forms in context.	nearest or most immediate in place, time, or causal sequence	The proximate cause of the outage was a fallen power line.
746	regulatory	adjective Study Field: Grade 9 precise high-utility word Word study: Base-form focus: regulatory is the dictionary headword; compare its inflected or derived forms in context.	relating to official rules that control an activity or industry	The agency has regulatory authority over drinking-water quality.
747	illustrative	adjective Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ive commonly forms an adjective meaning having a quality or tendency.	serving as a clear example or explanation	The report includes an illustrative case from a small coastal town.
748	restrictive	adjective Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ive commonly forms an adjective meaning having a quality or tendency.	limiting freedom, amount, or possibility more than is usual	The drought led to restrictive rules on outdoor water use.
749	sequential	adjective Study Field: Grade 9 precise high-utility word Word study: Base-form focus: sequential is the dictionary headword; compare its inflected or derived forms in context.	arranged or occurring in a logical or numerical order	The instructions present the repair steps in sequential order.
750	substantive	adjective Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ive commonly forms an adjective meaning having a quality or tendency.	having real importance, content, or practical effect	The revision makes a substantive change to tenant protections.
751	enduring	adjective Study Field: Grade 9 precise high-utility word Word study: Base-form focus: enduring is the dictionary headword; compare its inflected or derived forms in context.	continuing for a long time or remaining important	The court decision had an enduring influence on civil rights.
752	transmissible	adjective Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ible means capable of, suitable for, or able to be affected.	capable of being passed from one person, system, or place to another	The disease is transmissible through contaminated water.
753	auditable	adjective Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -able means capable of, suitable for, or worthy of an action.	recorded clearly enough to permit independent examination	Every purchase must leave an auditable trail.
754	underlying	adjective Study Field: Grade 9 precise high-utility word Word study: Base-form focus: underlying is the dictionary headword; compare its inflected or derived forms in context.	fundamental but not always immediately visible	The physician treated the underlying infection rather than only the fever.
755	additive	adjective Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ive commonly forms an adjective meaning having a quality or tendency.	increasing a result through the combined contribution of separate parts	The two small delays had an additive effect on travel time.
756	comparative	adjective Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ive commonly forms an adjective meaning having a quality or tendency.	based on examining similarities and differences between two or more things	The comparative essay considers how both novels portray exile.
757	competitive	adjective Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ive commonly forms an adjective meaning having a quality or tendency.	involving rivalry or offering a strong chance of success against alternatives	The company submitted a competitive bid for the project.
758	contextual	adjective Study Field: Grade 9 precise high-utility word Word study: Base-form focus: contextual is the dictionary headword; compare its inflected or derived forms in context.	relating to the circumstances that surround and help explain something	Contextual evidence shows that “draft” refers to a preliminary document.
759	correlational	adjective Study Field: Grade 9 precise high-utility word Word study: Base-form focus: correlational is the dictionary headword; compare its inflected or derived forms in context.	showing or studying an association without necessarily proving cause	The correlational study found that sleep and concentration changed together.
760	deliberative	adjective Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ive commonly forms an adjective meaning having a quality or tendency.	involving careful discussion and consideration before action	The citizens' panel used a deliberative process rather than a quick vote.
761	diagnostic	adjective Study Field: Grade 9 precise high-utility word Word study: Base-form focus: diagnostic is the dictionary headword; compare its inflected or derived forms in context.	used to identify the nature or cause of a condition or problem	The mechanic ran a diagnostic test on the engine.
762	differential	adjective Study Field: Grade 9 precise high-utility word Word study: Base-form focus: differential is the dictionary headword; compare its inflected or derived forms in context.	relating to a difference in amount, rate, or treatment	A pressure differential moves air through the vent.
763	distributive	adjective Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ive commonly forms an adjective meaning having a quality or tendency.	relating to how benefits, burdens, or quantities are divided	The debate concerns distributive fairness in the tax system.
764	environmental	adjective Study Field: Grade 9 precise high-utility word Word study: Base-form focus: environmental is the dictionary headword; compare its inflected or derived forms in context.	relating to natural surroundings or the conditions affecting organisms	The review identifies environmental risks to the wetland.
765	evaluative	adjective Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ive commonly forms an adjective meaning having a quality or tendency.	involving judgment according to stated criteria	The conclusion makes an evaluative claim about the policy's success.
766	inferential	adjective Study Field: Grade 9 precise high-utility word Word study: Base-form focus: inferential is the dictionary headword; compare its inflected or derived forms in context.	using evidence from a sample or observations to reach a conclusion beyond them	Inferential statistics estimates population traits from sample data.
767	interpretative	adjective Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ive commonly forms an adjective meaning having a quality or tendency.	offering an explanation of meaning or significance	The museum's interpretative label connects the tool with daily village life.
768	methodological	adjective Study Field: Grade 9 precise high-utility word Word study: Base-form focus: methodological is the dictionary headword; compare its inflected or derived forms in context.	relating to the methods used in a study or investigation	A methodological flaw made the comparison unreliable.
769	participatory	adjective Study Field: Grade 9 precise high-utility word Word study: Base-form focus: participatory is the dictionary headword; compare its inflected or derived forms in context.	actively involving the people affected by a decision or project	Participatory planning invited residents to design the park.
770	predictive	adjective Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ive commonly forms an adjective meaning having a quality or tendency.	used to estimate what is likely to happen	The predictive model estimates tomorrow's electricity demand.

Writing a Negotiable Proposal

Reading practice for pages 22–23. Five relevant words are highlighted.

English reading

A student council prepares a legislative proposal for later library hours. Its goal must be measurable, such as a documented increase in supervised study time. The writers avoid manipulative claims and support each cost with justifiable evidence. Because staffing remains negotiable, they offer several schedules instead of insisting on one fixed demand.

Reading comprehension

1. What makes the proposal's goal measurable?

It names a documented increase in supervised study time.

2. What kind of claims do the writers avoid?

They avoid manipulative claims.

3. Why do they offer several schedules?

Staffing remains negotiable.

Page 23: words 771–800

Vocabulary page 23
#	Word	Details	Meaning	Sample sentence
771	procedural	adjective Study Field: Grade 9 precise high-utility word Word study: Base-form focus: procedural is the dictionary headword; compare its inflected or derived forms in context.	relating to an established method or sequence of actions	A procedural error invalidated the vote count.
772	relational	adjective Study Field: Grade 9 precise high-utility word Word study: Base-form focus: relational is the dictionary headword; compare its inflected or derived forms in context.	concerning connections among people, ideas, or data	The database uses relational links between customers and orders.
773	structural	adjective Study Field: Grade 9 precise high-utility word Word study: Base-form focus: structural is the dictionary headword; compare its inflected or derived forms in context.	relating to the arrangement, framework, or load-bearing parts of something	The earthquake caused structural damage to two columns.
774	systematic	adjective Study Field: Grade 9 precise high-utility word Word study: Base-form focus: systematic is the dictionary headword; compare its inflected or derived forms in context.	carried out according to an organized and consistent method	The researchers conducted a systematic search of every archive.
775	transferable	adjective Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -able means capable of, suitable for, or worthy of an action.	capable of being moved or applied to another person, place, or situation	Clear writing is a transferable skill useful across subjects.
776	unbiased	adjective Study Field: Grade 9 precise high-utility word Word study: Base-form focus: unbiased is the dictionary headword; compare its inflected or derived forms in context.	not unfairly favoring one side, group, or result	A random process aims to produce an unbiased sample.
777	verifiable	adjective Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -able means capable of, suitable for, or worthy of an action.	capable of being checked and confirmed with evidence	The article includes verifiable dates and public records.
778	coordinated	adjective Study Field: Grade 9 precise high-utility word Word study: Base-form focus: coordinated is the dictionary headword; compare its inflected or derived forms in context.	organized so that separate people or parts work together effectively	A coordinated response delivered food and medicine to isolated towns.
779	interdisciplinary	adjective Study Field: Grade 9 precise high-utility word Word study: Prefix focus: inter- means between or among.	combining knowledge or methods from more than one field of study	The interdisciplinary course connects ecology, economics, and public policy.
780	multidisciplinary	adjective Study Field: Grade 9 precise high-utility word Word study: Prefix focus: multi- means many.	involving specialists from several fields who contribute their distinct expertise	A multidisciplinary team of engineers, doctors, and designers developed the device.
781	accrue	verb Study Field: Grade 9 precise high-utility word Word study: Base-form focus: accrue is the dictionary headword; compare its inflected or derived forms in context.	to accumulate or become due gradually over time	Interest will accrue each month that the balance remains unpaid.
782	administer	verb Study Field: Grade 9 precise high-utility word Word study: Base-form focus: administer is the dictionary headword; compare its inflected or derived forms in context.	to manage, direct, or formally provide something	Trained nurses administer the vaccine.
783	rectify	verb Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ify commonly forms a verb meaning to make or become.	to correct something that is wrong or inaccurate	The publisher issued a notice to rectify the mislabeled chart.
784	arbitrate	verb Study Field: Grade 9 precise high-utility word Word study: Base-form focus: arbitrate is the dictionary headword; compare its inflected or derived forms in context.	to hear a dispute and make or help reach a decision	An independent panel will arbitrate the contract disagreement.
785	authenticate	verb Study Field: Grade 9 precise high-utility word Word study: Base-form focus: authenticate is the dictionary headword; compare its inflected or derived forms in context.	to verify that something or someone is genuine	Experts authenticate the painting by examining pigments and ownership records.
786	centralize	verb Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ize commonly forms a verb meaning to make, become, or apply.	to bring authority, services, or operations under one central control	The district will centralize purchasing to reduce duplicate orders.
787	circulate	verb Study Field: Grade 9 precise high-utility word Word study: Base-form focus: circulate is the dictionary headword; compare its inflected or derived forms in context.	to move continuously through a system or distribute among people	The pump will circulate warm water through the building.
788	reimburse	verb Study Field: Grade 9 precise high-utility word Word study: Base-form focus: reimburse is the dictionary headword; compare its inflected or derived forms in context.	to repay money spent or lost for an approved reason	The organization will reimburse volunteers for train fares.
789	conform	verb Study Field: Grade 9 precise high-utility word Word study: Base-form focus: conform is the dictionary headword; compare its inflected or derived forms in context.	to match a rule, standard, pattern, or expectation	All helmets must conform to the updated safety standard.
790	synchronize	verb Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ize commonly forms a verb meaning to make, become, or apply.	to arrange events or devices so they occur or operate at the same time	The technicians synchronize the clocks before collecting measurements.
791	correspond	verb Study Field: Grade 9 precise high-utility word Word study: Base-form focus: correspond is the dictionary headword; compare its inflected or derived forms in context.	to match, relate closely, or communicate through messages	Each colored line should correspond to one category in the key.
792	deactivate	verb Study Field: Grade 9 precise high-utility word Word study: Base-form focus: deactivate is the dictionary headword; compare its inflected or derived forms in context.	to make a device, system, or process inactive	The code will deactivate the alarm after identity verification.
793	decentralize	verb Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ize commonly forms a verb meaning to make, become, or apply.	to distribute authority or operations away from one central body	The reform will decentralize health services to regional offices.
794	designate	verb Study Field: Grade 9 precise high-utility word Word study: Base-form focus: designate is the dictionary headword; compare its inflected or derived forms in context.	to officially name, assign, or mark something for a particular purpose	The city will designate the wetland as a protected area.
795	make public	verb Study Field: Grade 9 precise high-utility word Word study: Term structure: make + public. Study the complete expression as one field-specific unit.	to disclose information openly to the community	The agency must make public the final inspection report.
796	diversify	verb Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ify commonly forms a verb meaning to make or become.	to add variety in order to expand options or reduce dependence	The farm will diversify by growing grains, fruit, and vegetables.
797	enforce	verb Study Field: Grade 9 precise high-utility word Word study: Base-form focus: enforce is the dictionary headword; compare its inflected or derived forms in context.	to make sure a law, rule, or agreement is obeyed	Inspectors enforce limits on unsafe emissions.
798	amplify	verb Study Field: Grade 9 precise high-utility word Word study: Suffix focus: -ify commonly forms a verb meaning to make or become.	to increase the strength, volume, or effect of something	The curved wall can amplify sound across the theater.
799	exclude	verb Study Field: Grade 9 precise high-utility word Word study: Base-form focus: exclude is the dictionary headword; compare its inflected or derived forms in context.	to leave out or prevent from entering or participating	A study should not exclude relevant evidence merely because it challenges the hypothesis.
800	leverage	verb Study Field: Grade 9 precise high-utility word Word study: Base-form focus: leverage is the dictionary headword; compare its inflected or derived forms in context.	to use a resource or advantage effectively to achieve a result	The town will leverage its rail connection to attract new businesses.

Sources and curriculum references

These references guide selection and calibration. Definitions, sample sentences, readings, questions, and teaching notes are independently written and reviewed.