This question tests 4th grade informational/explanatory writing skills: using precise language and domain-specific vocabulary to inform about or explain the topic (CCSS.W.4.2.d). Informational and explanatory writing should use precise language and domain-specific vocabulary—this means using technical terms appropriate to the subject area instead of vague, everyday words. Domain-specific vocabulary = technical terms from the subject: Science (habitat, adaptation, metamorphosis, predator, prey, evaporation, condensation, friction, orbit, precipitation); Social Studies (hemisphere, representative, peninsula, primary source, citizen, democracy); Math (perimeter, numerator, variable, parallel). Precise vs vague: Precise = 'The carnivore hunts prey in its habitat' (technical terms: carnivore, prey, habitat make meaning clear); Vague = 'The animal that eats meat finds food where it lives' (everyday words, less precise). Precise = 'Evaporation occurs when liquid water becomes water vapor' (technical: evaporation, liquid, water vapor); Vague = 'Water goes up into the air when it gets hot' (general words). Why it matters: Domain vocabulary makes explanations clearer and more accurate; shows understanding of subject; provides specific, exact meaning; is standard in each field (scientists say 'evaporation' not 'water going up'). Using precise, subject-specific language is important in informational writing to communicate accurately. Jamal writes about fractions in math. The explanation uses vague, everyday language such as 'top number' and 'bottom number' instead of domain vocabulary. Choice A is correct because Jamal should add domain-specific vocabulary like 'numerator' and 'denominator' which correctly and precisely describe the concepts in math, instead of vague words. Choice B is incorrect because it confuses everyday phrases with technical terms and identifies words that aren't actually technical terms for this subject; students sometimes don't know or avoid subject-specific vocabulary. To help students use precise language and domain-specific vocabulary: Build domain vocabulary explicitly for each subject unit; create word walls with science terms, social studies terms, math terms—display with definitions; teach technical terms directly before writing: 'When explaining water cycle, use these precise terms: evaporation (liquid→vapor), condensation (vapor→liquid), precipitation (water falling)—not vague words like “water goes up” or “water comes down”'; model replacing vague with precise: 'I wrote “The animal lives in a place.” Too vague! Replace: “The arctic fox inhabits the tundra habitat.” Now I used domain vocabulary: inhabits, tundra, habitat.'; practice precision substitutions: give sentences with vague language, students replace with domain terms ('The rock formed from hot stuff' → 'The igneous rock formed from cooled lava'); use frayer model for vocabulary: term in center, definition, characteristics, examples, non-examples; require vocabulary use in writing: 'Your explanation must include these domain terms: habitat, adaptation, predator, prey.'. Emphasize precision purpose: 'Domain vocabulary makes your explanation clearer. “Evaporation” tells exactly what happens—“water going up” is vague.'; compare vague vs precise examples side-by-side; teach subject-appropriate terms: science topics need science vocabulary, social studies topics need social studies terms; provide vocabulary banks during writing; give feedback: 'Replace “stuff” with domain vocabulary: “adaptations.”' or 'Use precise term “hemisphere” instead of “half of Earth”'; practice reading informational text, identify domain vocabulary authors use; teach correct usage: 'Predator hunts prey, not reversed. Predator is the hunter, prey is hunted.'; encourage defining terms: 'Metamorphosis—the transformation from larva to adult—takes weeks'. Watch for: students who use vague words like 'stuff,' 'things,' 'place' instead of technical terms; students who avoid domain vocabulary because unfamiliar; students who use everyday language ('water going up') instead of technical terms ('evaporation'). Common pitfall: students who mix precise and vague in same writing; students who use technical terms incorrectly; students who don't understand that domain vocabulary varies by subject; students who think any descriptive word is precise; students who don't define technical terms when introducing them; teach explicitly: informational writing uses subject-specific vocabulary to be clear and accurate.

This question tests 4th grade informational/explanatory writing skills: using precise language and domain-specific vocabulary to inform about or explain the topic (CCSS.W.4.2.d). Informational and explanatory writing should use precise language and domain-specific vocabulary—this means using technical terms appropriate to the subject area instead of vague, everyday words. Domain-specific vocabulary = technical terms from the subject: Science (habitat, adaptation, metamorphosis, predator, prey, evaporation, condensation, friction, orbit, precipitation); Social Studies (hemisphere, representative, peninsula, primary source, citizen, democracy); Math (perimeter, numerator, variable, parallel). Precise vs vague: Precise = 'The carnivore hunts prey in its habitat' (technical terms: carnivore, prey, habitat make meaning clear); Vague = 'The animal that eats meat finds food where it lives' (everyday words, less precise). Precise = 'Evaporation occurs when liquid water becomes water vapor' (technical: evaporation, liquid, water vapor); Vague = 'Water goes up into the air when it gets hot' (general words). Why it matters: Domain vocabulary makes explanations clearer and more accurate; shows understanding of subject; provides specific, exact meaning; is standard in each field (scientists say 'evaporation' not 'water going up'). Using precise, subject-specific language is important in informational writing to communicate accurately. Marcus writes about voting in social studies (civics). The explanation uses precise language and domain-specific vocabulary such as 'democracy,' 'citizens,' 'vote,' 'election,' 'representatives' which are appropriate technical terms for social studies. Choice A is correct because Marcus uses precise language and domain-specific vocabulary—technical terms like 'democracy,' 'citizens,' 'vote,' 'election,' 'representatives' are appropriate for social studies and make the explanation clear and accurate. Choice B is incorrect because it confuses everyday phrases ('choose,' 'people') with technical terms; students sometimes think general, descriptive words are precise enough. To help students use precise language and domain-specific vocabulary: Build domain vocabulary explicitly for each subject unit; create word walls with science terms, social studies terms, math terms—display with definitions; teach technical terms directly before writing: 'When explaining water cycle, use these precise terms: evaporation (liquid→vapor), condensation (vapor→liquid), precipitation (water falling)—not vague words like “water goes up” or “water comes down”'; model replacing vague with precise: 'I wrote “The animal lives in a place.” Too vague! Replace: “The arctic fox inhabits the tundra habitat.” Now I used domain vocabulary: inhabits, tundra, habitat.'; practice precision substitutions: give sentences with vague language, students replace with domain terms ('The rock formed from hot stuff' → 'The igneous rock formed from cooled lava'); use frayer model for vocabulary: term in center, definition, characteristics, examples, non-examples; require vocabulary use in writing: 'Your explanation must include these domain terms: habitat, adaptation, predator, prey.'. Emphasize precision purpose: 'Domain vocabulary makes your explanation clearer. “Evaporation” tells exactly what happens—“water going up” is vague.'; compare vague vs precise examples side-by-side; teach subject-appropriate terms: science topics need science vocabulary, social studies topics need social studies terms; provide vocabulary banks during writing; give feedback: 'Replace “stuff” with domain vocabulary: “adaptations.”' or 'Use precise term “hemisphere” instead of “half of Earth”'; practice reading informational text, identify domain vocabulary authors use; teach correct usage: 'Predator hunts prey, not reversed. Predator is the hunter, prey is hunted.'; encourage defining terms: 'Metamorphosis—the transformation from larva to adult—takes weeks'. Watch for: students who use vague words like 'stuff,' 'things,' 'place' instead of technical terms; students who avoid domain vocabulary because unfamiliar; students who use everyday language ('water going up') instead of technical terms ('evaporation'). Common pitfall: students who mix precise and vague in same writing; students who use technical terms incorrectly; students who don't understand that domain vocabulary varies by subject; students who think any descriptive word is precise; students who don't define technical terms when introducing them; teach explicitly: informational writing uses subject-specific vocabulary to be clear and accurate.

This question tests 4th grade informational/explanatory writing skills: using precise language and domain-specific vocabulary to inform about or explain the topic (CCSS.W.4.2.d). Informational and explanatory writing should use precise language and domain-specific vocabulary—this means using technical terms appropriate to the subject area instead of vague, everyday words. Domain-specific vocabulary = technical terms from the subject: Science (habitat, adaptation, metamorphosis, predator, prey, evaporation, condensation, friction, orbit, precipitation); Social Studies (hemisphere, representative, peninsula, primary source, citizen, democracy); Math (perimeter, numerator, variable, parallel). Precise vs vague: Precise = 'The carnivore hunts prey in its habitat' (technical terms: carnivore, prey, habitat make meaning clear); Vague = 'The animal that eats meat finds food where it lives' (everyday words, less precise). Precise = 'Evaporation occurs when liquid water becomes water vapor' (technical: evaporation, liquid, water vapor); Vague = 'Water goes up into the air when it gets hot' (general words). Why it matters: Domain vocabulary makes explanations clearer and more accurate; shows understanding of subject; provides specific, exact meaning; is standard in each field (scientists say 'evaporation' not 'water going up'). Using precise, subject-specific language is important in informational writing to communicate accurately. Emma writes about the water cycle in science. The explanation uses vague, everyday language such as 'goes up,' 'makes clouds,' 'comes down' instead of domain vocabulary; it mixes some precise terms like 'water cycle' with vague words like 'goes up' and 'comes down.' Choice A is correct because Emma could make her language more precise by replacing 'goes up' with 'evaporation,' 'makes clouds' with 'condensation,' and 'comes down' with 'precipitation' because these technical terms are more accurate and clear for science writing. Choice B is incorrect because it accepts vague words like 'goes up' or 'comes down' as precise vocabulary when domain-specific terms would be more accurate; students sometimes use everyday language ('water going up') instead of technical terms ('evaporation'). To help students use precise language and domain-specific vocabulary: Build domain vocabulary explicitly for each subject unit; create word walls with science terms, social studies terms, math terms—display with definitions; teach technical terms directly before writing: 'When explaining water cycle, use these precise terms: evaporation (liquid→vapor), condensation (vapor→liquid), precipitation (water falling)—not vague words like “water goes up” or “water comes down”'; model replacing vague with precise: 'I wrote “The animal lives in a place.” Too vague! Replace: “The arctic fox inhabits the tundra habitat.” Now I used domain vocabulary: inhabits, tundra, habitat.'; practice precision substitutions: give sentences with vague language, students replace with domain terms ('The rock formed from hot stuff' → 'The igneous rock formed from cooled lava'); use frayer model for vocabulary: term in center, definition, characteristics, examples, non-examples; require vocabulary use in writing: 'Your explanation must include these domain terms: habitat, adaptation, predator, prey.'. Emphasize precision purpose: 'Domain vocabulary makes your explanation clearer. “Evaporation” tells exactly what happens—“water going up” is vague.'; compare vague vs precise examples side-by-side; teach subject-appropriate terms: science topics need science vocabulary, social studies topics need social studies terms; provide vocabulary banks during writing; give feedback: 'Replace “stuff” with domain vocabulary: “adaptations.”' or 'Use precise term “hemisphere” instead of “half of Earth”'; practice reading informational text, identify domain vocabulary authors use; teach correct usage: 'Predator hunts prey, not reversed. Predator is the hunter, prey is hunted.'; encourage defining terms: 'Metamorphosis—the transformation from larva to adult—takes weeks'. Watch for: students who use vague words like 'stuff,' 'things,' 'place' instead of technical terms; students who avoid domain vocabulary because unfamiliar; students who use everyday language ('water going up') instead of technical terms ('evaporation'). Common pitfall: students who mix precise and vague in same writing; students who use technical terms incorrectly; students who don't understand that domain vocabulary varies by subject; students who think any descriptive word is precise; students who don't define technical terms when introducing them; teach explicitly: informational writing uses subject-specific vocabulary to be clear and accurate.

This question tests 4th grade informational/explanatory writing skills: using precise language and domain-specific vocabulary to inform about or explain the topic (CCSS.W.4.2.d). Informational and explanatory writing should use precise language and domain-specific vocabulary—this means using technical terms appropriate to the subject area instead of vague, everyday words. Domain-specific vocabulary = technical terms from the subject: Science (habitat, adaptation, metamorphosis, predator, prey, evaporation, condensation, friction, orbit, precipitation); Social Studies (hemisphere, representative, peninsula, primary source, citizen, democracy); Math (perimeter, numerator, variable, parallel). Precise vs vague: Precise = 'The carnivore hunts prey in its habitat' (technical terms: carnivore, prey, habitat make meaning clear); Vague = 'The animal that eats meat finds food where it lives' (everyday words, less precise). Precise = 'Evaporation occurs when liquid water becomes water vapor' (technical: evaporation, liquid, water vapor); Vague = 'Water goes up into the air when it gets hot' (general words). Why it matters: Domain vocabulary makes explanations clearer and more accurate; shows understanding of subject; provides specific, exact meaning; is standard in each field (scientists say 'evaporation' not 'water going up'). Using precise, subject-specific language is important in informational writing to communicate accurately. Maya writes about motion in science (physical science). The explanation uses vague, everyday language such as 'stuff' and 'makes things slow' instead of domain vocabulary. Choice A is correct because the sentence 'Friction is a force that opposes motion between two surfaces rubbing together' uses subject-specific language—terms like 'friction,' 'force,' 'opposes motion' which accurately and precisely describe the concept in science. Choice B is incorrect because it accepts vague words like 'bad' or 'not go fast' as precise vocabulary when domain-specific terms would be more accurate; students sometimes use vague words like 'stuff,' 'things,' 'place' instead of technical terms. To help students use precise language and domain-specific vocabulary: Build domain vocabulary explicitly for each subject unit; create word walls with science terms, social studies terms, math terms—display with definitions; teach technical terms directly before writing: 'When explaining water cycle, use these precise terms: evaporation (liquid→vapor), condensation (vapor→liquid), precipitation (water falling)—not vague words like “water goes up” or “water comes down”'; model replacing vague with precise: 'I wrote “The animal lives in a place.” Too vague! Replace: “The arctic fox inhabits the tundra habitat.” Now I used domain vocabulary: inhabits, tundra, habitat.'; practice precision substitutions: give sentences with vague language, students replace with domain terms ('The rock formed from hot stuff' → 'The igneous rock formed from cooled lava'); use frayer model for vocabulary: term in center, definition, characteristics, examples, non-examples; require vocabulary use in writing: 'Your explanation must include these domain terms: habitat, adaptation, predator, prey.'. Emphasize precision purpose: 'Domain vocabulary makes your explanation clearer. “Evaporation” tells exactly what happens—“water going up” is vague.'; compare vague vs precise examples side-by-side; teach subject-appropriate terms: science topics need science vocabulary, social studies topics need social studies terms; provide vocabulary banks during writing; give feedback: 'Replace “stuff” with domain vocabulary: “adaptations.”' or 'Use precise term “hemisphere” instead of “half of Earth”'; practice reading informational text, identify domain vocabulary authors use; teach correct usage: 'Predator hunts prey, not reversed. Predator is the hunter, prey is hunted.'; encourage defining terms: 'Metamorphosis—the transformation from larva to adult—takes weeks'. Watch for: students who use vague words like 'stuff,' 'things,' 'place' instead of technical terms; students who avoid domain vocabulary because unfamiliar; students who use everyday language ('water going up') instead of technical terms ('evaporation'). Common pitfall: students who mix precise and vague in same writing; students who use technical terms incorrectly; students who don't understand that domain vocabulary varies by subject; students who think any descriptive word is precise; students who don't define technical terms when introducing them; teach explicitly: informational writing uses subject-specific vocabulary to be clear and accurate.

This question tests 4th grade informational/explanatory writing skills: using precise language and domain-specific vocabulary to inform about or explain the topic (CCSS.W.4.2.d). Informational and explanatory writing should use precise language and domain-specific vocabulary—this means using technical terms appropriate to the subject area instead of vague, everyday words. Domain-specific vocabulary = technical terms from the subject: Science (habitat, adaptation, metamorphosis, predator, prey, evaporation, condensation, friction, orbit, precipitation); Social Studies (hemisphere, representative, peninsula, primary source, citizen, democracy); Math (perimeter, numerator, variable, parallel). Precise vs vague: Precise = 'The carnivore hunts prey in its habitat' (technical terms: carnivore, prey, habitat make meaning clear); Vague = 'The animal that eats meat finds food where it lives' (everyday words, less precise). Precise = 'Evaporation occurs when liquid water becomes water vapor' (technical: evaporation, liquid, water vapor); Vague = 'Water goes up into the air when it gets hot' (general words). Why it matters: Domain vocabulary makes explanations clearer and more accurate; shows understanding of subject; provides specific, exact meaning; is standard in each field (scientists say 'evaporation' not 'water going up'). Using precise, subject-specific language is important in informational writing to communicate accurately. Sofia writes about landforms in social studies (geography). The explanation uses precise language and domain-specific vocabulary such as 'peninsula' which is an appropriate technical term for social studies, but mixes it with vague words like 'sticking out with water around it.' Choice A is correct because Sofia does not use precise language—the explanation uses vague, everyday words like 'sticking out with water around it' instead of domain-specific vocabulary like 'surrounded by water on three sides' which would be more precise for this social studies topic. Choice B is incorrect because it doesn't recognize that domain vocabulary like 'peninsula' is present in the writing; students sometimes mix precise terms with vague language. To help students use precise language and domain-specific vocabulary: Build domain vocabulary explicitly for each subject unit; create word walls with science terms, social studies terms, math terms—display with definitions; teach technical terms directly before writing: 'When explaining water cycle, use these precise terms: evaporation (liquid→vapor), condensation (vapor→liquid), precipitation (water falling)—not vague words like “water goes up” or “water comes down”'; model replacing vague with precise: 'I wrote “The animal lives in a place.” Too vague! Replace: “The arctic fox inhabits the tundra habitat.” Now I used domain vocabulary: inhabits, tundra, habitat.'; practice precision substitutions: give sentences with vague language, students replace with domain terms ('The rock formed from hot stuff' → 'The igneous rock formed from cooled lava'); use frayer model for vocabulary: term in center, definition, characteristics, examples, non-examples; require vocabulary use in writing: 'Your explanation must include these domain terms: habitat, adaptation, predator, prey.'. Emphasize precision purpose: 'Domain vocabulary makes your explanation clearer. “Evaporation” tells exactly what happens—“water going up” is vague.'; compare vague vs precise examples side-by-side; teach subject-appropriate terms: science topics need science vocabulary, social studies topics need social studies terms; provide vocabulary banks during writing; give feedback: 'Replace “stuff” with domain vocabulary: “adaptations.”' or 'Use precise term “hemisphere” instead of “half of Earth”'; practice reading informational text, identify domain vocabulary authors use; teach correct usage: 'Predator hunts prey, not reversed. Predator is the hunter, prey is hunted.'; encourage defining terms: 'Metamorphosis—the transformation from larva to adult—takes weeks'. Watch for: students who use vague words like 'stuff,' 'things,' 'place' instead of technical terms; students who avoid domain vocabulary because unfamiliar; students who use everyday language ('water going up') instead of technical terms ('evaporation'). Common pitfall: students who mix precise and vague in same writing; students who use technical terms incorrectly; students who don't understand that domain vocabulary varies by subject; students who think any descriptive word is precise; students who don't define technical terms when introducing them; teach explicitly: informational writing uses subject-specific vocabulary to be clear and accurate.

This question tests 4th grade informational/explanatory writing skills: using precise language and domain-specific vocabulary to inform about or explain the topic (CCSS.W.4.2.d). Informational and explanatory writing should use precise language and domain-specific vocabulary—this means using technical terms appropriate to the subject area instead of vague, everyday words; domain-specific vocabulary includes technical terms from the subject like science (habitat, adaptation, metamorphosis, predator, prey, evaporation, condensation, friction, orbit, precipitation), social studies (hemisphere, representative, peninsula, primary source, citizen, democracy), or math (perimeter, numerator, variable, parallel); precise vs vague: precise = 'The carnivore hunts prey in its habitat' (technical terms: carnivore, prey, habitat make meaning clear); vague = 'The animal that eats meat finds food where it lives' (everyday words, less precise); precise = 'Evaporation occurs when liquid water becomes water vapor' (technical: evaporation, liquid, water vapor); vague = 'Water goes up into the air when it gets hot' (general words); why it matters: domain vocabulary makes explanations clearer and more accurate, shows understanding of subject, provides specific, exact meaning, and is standard in each field (scientists say 'evaporation' not 'water going up'); using precise, subject-specific language is important in informational writing to communicate accurately. Carlos writes about fractions in math; the explanation uses precise language and domain-specific vocabulary such as 'numerator' and 'denominator' which are appropriate technical terms for math. Choice B is correct because Carlos uses precise language and domain-specific vocabulary—technical terms like 'numerator' and 'denominator' are appropriate for math and make the explanation clear and accurate. Choice A is incorrect because it suggests vague replacements instead of more precise domain vocabulary; students sometimes avoid domain vocabulary because unfamiliar. To help students use precise language and domain-specific vocabulary: build domain vocabulary explicitly for each subject unit; create word walls with science terms, social studies terms, math terms—display with definitions; teach technical terms directly before writing: 'When explaining water cycle, use these precise terms: evaporation (liquid→vapor), condensation (vapor→liquid), precipitation (water falling)—not vague words like “water goes up” or “water comes down”'; model replacing vague with precise: 'I wrote “The animal lives in a place.” Too vague! Replace: “The arctic fox inhabits the tundra habitat.” Now I used domain vocabulary: inhabits, tundra, habitat.'; practice precision substitutions: give sentences with vague language, students replace with domain terms ('The rock formed from hot stuff' → 'The igneous rock formed from cooled lava'). Emphasize precision purpose: 'Domain vocabulary makes your explanation clearer; “evaporation” tells exactly what happens—“water going up” is vague'; compare vague vs precise examples side-by-side; teach subject-appropriate terms: science topics need science vocabulary, social studies topics need social studies terms; provide vocabulary banks during writing; give feedback: 'Replace “stuff” with domain vocabulary: “adaptations”' or 'Use precise term “hemisphere” instead of “half of Earth”'; practice reading informational text, identify domain vocabulary authors use; teach correct usage: 'Predator hunts prey, not reversed; predator is the hunter, prey is hunted'; encourage defining terms: 'Metamorphosis—the transformation from larva to adult—takes weeks'; watch for: students who use vague words like 'stuff,' 'things,' 'place' instead of technical terms; students who avoid domain vocabulary because unfamiliar; students who use everyday language ('water going up') instead of technical terms ('evaporation'); students who mix precise and vague in same writing; students who use technical terms incorrectly; students who don't understand that domain vocabulary varies by subject; students who think any descriptive word is precise; students who don't define technical terms when introducing them; teach explicitly: informational writing uses subject-specific vocabulary to be clear and accurate.

This question tests 4th grade informational/explanatory writing skills: using precise language and domain-specific vocabulary to inform about or explain the topic (CCSS.W.4.2.d). Informational and explanatory writing should use precise language and domain-specific vocabulary—this means using technical terms appropriate to the subject area instead of vague, everyday words; domain-specific vocabulary includes technical terms from the subject like science (habitat, adaptation, metamorphosis, predator, prey, evaporation, condensation, friction, orbit, precipitation), social studies (hemisphere, representative, peninsula, primary source, citizen, democracy), or math (perimeter, numerator, variable, parallel); precise vs vague: precise = 'The carnivore hunts prey in its habitat' (technical terms: carnivore, prey, habitat make meaning clear); vague = 'The animal that eats meat finds food where it lives' (everyday words, less precise); precise = 'Evaporation occurs when liquid water becomes water vapor' (technical: evaporation, liquid, water vapor); vague = 'Water goes up into the air when it gets hot' (general words); why it matters: domain vocabulary makes explanations clearer and more accurate, shows understanding of subject, provides specific, exact meaning, and is standard in each field (scientists say 'evaporation' not 'water going up'); using precise, subject-specific language is important in informational writing to communicate accurately. Jamal writes about Arctic foxes in life science; the explanation uses vague, everyday language such as 'stuff,' 'cold places,' and 'bigger animals' instead of domain vocabulary; if precise: he should use specific domain vocabulary like 'adaptation,' 'camouflage,' 'habitat,' and 'predator' correctly. Choice B is correct because Jamal does not use precise language—the explanation uses vague, everyday words like 'stuff' and 'cold places' instead of domain-specific vocabulary like 'adaptation,' 'camouflage,' and 'habitat' which would be more precise for this science topic. Choice A is incorrect because it claims the explanation uses precise language when technical terms are missing; students sometimes use vague words like 'stuff,' 'things,' 'place' instead of technical terms. To help students use precise language and domain-specific vocabulary: build domain vocabulary explicitly for each subject unit; create word walls with science terms, social studies terms, math terms—display with definitions; teach technical terms directly before writing: 'When explaining water cycle, use these precise terms: evaporation (liquid→vapor), condensation (vapor→liquid), precipitation (water falling)—not vague words like “water goes up” or “water comes down”'; model replacing vague with precise: 'I wrote “The animal lives in a place.” Too vague! Replace: “The arctic fox inhabits the tundra habitat.” Now I used domain vocabulary: inhabits, tundra, habitat.'; practice precision substitutions: give sentences with vague language, students replace with domain terms ('The rock formed from hot stuff' → 'The igneous rock formed from cooled lava'). Emphasize precision purpose: 'Domain vocabulary makes your explanation clearer; “evaporation” tells exactly what happens—“water going up” is vague'; compare vague vs precise examples side-by-side; teach subject-appropriate terms: science topics need science vocabulary, social studies topics need social studies terms; provide vocabulary banks during writing; give feedback: 'Replace “stuff” with domain vocabulary: “adaptations”' or 'Use precise term “hemisphere” instead of “half of Earth”'; practice reading informational text, identify domain vocabulary authors use; teach correct usage: 'Predator hunts prey, not reversed; predator is the hunter, prey is hunted'; encourage defining terms: 'Metamorphosis—the transformation from larva to adult—takes weeks'; watch for: students who use vague words like 'stuff,' 'things,' 'place' instead of technical terms; students who avoid domain vocabulary because unfamiliar; students who use everyday language ('water going up') instead of technical terms ('evaporation'); students who mix precise and vague in same writing; students who use technical terms incorrectly; students who don't understand that domain vocabulary varies by subject; students who think any descriptive word is precise; students who don't define technical terms when introducing them; teach explicitly: informational writing uses subject-specific vocabulary to be clear and accurate.

This question tests 4th grade informational/explanatory writing skills: using precise language and domain-specific vocabulary to inform about or explain the topic (CCSS.W.4.2.d). Informational and explanatory writing should use precise language and domain-specific vocabulary—this means using technical terms appropriate to the subject area instead of vague, everyday words; domain-specific vocabulary includes technical terms from the subject like science (habitat, adaptation, metamorphosis, predator, prey, evaporation, condensation, friction, orbit, precipitation), social studies (hemisphere, representative, peninsula, primary source, citizen, democracy), or math (perimeter, numerator, variable, parallel); precise vs vague: precise = 'The carnivore hunts prey in its habitat' (technical terms: carnivore, prey, habitat make meaning clear); vague = 'The animal that eats meat finds food where it lives' (everyday words, less precise); precise = 'Evaporation occurs when liquid water becomes water vapor' (technical: evaporation, liquid, water vapor); vague = 'Water goes up into the air when it gets hot' (general words); why it matters: domain vocabulary makes explanations clearer and more accurate, shows understanding of subject, provides specific, exact meaning, and is standard in each field (scientists say 'evaporation' not 'water going up'); using precise, subject-specific language is important in informational writing to communicate accurately. Marcus writes about the three branches of U.S. government in social studies; the explanation uses precise language and domain-specific vocabulary such as 'legislative,' 'executive,' 'judicial,' 'citizens,' and 'election' which are appropriate technical terms for social studies. Choice A is correct because Marcus uses precise language and domain-specific vocabulary—technical terms like 'legislative,' 'executive,' 'judicial,' 'citizens,' and 'election' are appropriate for social studies and make the explanation clear and accurate. Choice B is incorrect because it accepts vague words like 'makes' or 'carries' as precise vocabulary when domain-specific terms would be more accurate; students sometimes use vague words like 'stuff,' 'things,' 'place' instead of technical terms. To help students use precise language and domain-specific vocabulary: build domain vocabulary explicitly for each subject unit; create word walls with science terms, social studies terms, math terms—display with definitions; teach technical terms directly before writing: 'When explaining water cycle, use these precise terms: evaporation (liquid→vapor), condensation (vapor→liquid), precipitation (water falling)—not vague words like “water goes up” or “water comes down”'; model replacing vague with precise: 'I wrote “The animal lives in a place.” Too vague! Replace: “The arctic fox inhabits the tundra habitat.” Now I used domain vocabulary: inhabits, tundra, habitat.'; practice precision substitutions: give sentences with vague language, students replace with domain terms ('The rock formed from hot stuff' → 'The igneous rock formed from cooled lava'). Emphasize precision purpose: 'Domain vocabulary makes your explanation clearer; “evaporation” tells exactly what happens—“water going up” is vague'; compare vague vs precise examples side-by-side; teach subject-appropriate terms: science topics need science vocabulary, social studies topics need social studies terms; provide vocabulary banks during writing; give feedback: 'Replace “stuff” with domain vocabulary: “adaptations”' or 'Use precise term “hemisphere” instead of “half of Earth”'; practice reading informational text, identify domain vocabulary authors use; teach correct usage: 'Predator hunts prey, not reversed; predator is the hunter, prey is hunted'; encourage defining terms: 'Metamorphosis—the transformation from larva to adult—takes weeks'; watch for: students who use vague words like 'stuff,' 'things,' 'place' instead of technical terms; students who avoid domain vocabulary because unfamiliar; students who use everyday language ('water going up') instead of technical terms ('evaporation'); students who mix precise and vague in same writing; students who use technical terms incorrectly; students who don't understand that domain vocabulary varies by subject; students who think any descriptive word is precise; students who don't define technical terms when introducing them; teach explicitly: informational writing uses subject-specific vocabulary to be clear and accurate.

This question tests 4th grade informational/explanatory writing skills: using precise language and domain-specific vocabulary to inform about or explain the topic (CCSS.W.4.2.d). Informational and explanatory writing should use precise language and domain-specific vocabulary—this means using technical terms appropriate to the subject area instead of vague, everyday words; domain-specific vocabulary includes technical terms from the subject like science (habitat, adaptation, metamorphosis, predator, prey, evaporation, condensation, friction, orbit, precipitation), social studies (hemisphere, representative, peninsula, primary source, citizen, democracy), or math (perimeter, numerator, variable, parallel); precise vs vague: precise = 'The carnivore hunts prey in its habitat' (technical terms: carnivore, prey, habitat make meaning clear); vague = 'The animal that eats meat finds food where it lives' (everyday words, less precise); precise = 'Evaporation occurs when liquid water becomes water vapor' (technical: evaporation, liquid, water vapor); vague = 'Water goes up into the air when it gets hot' (general words); why it matters: domain vocabulary makes explanations clearer and more accurate, shows understanding of subject, provides specific, exact meaning, and is standard in each field (scientists say 'evaporation' not 'water going up'); using precise, subject-specific language is important in informational writing to communicate accurately. Yuki writes about using sources in history in social studies; the explanation uses precise language and domain-specific vocabulary such as 'primary source,' 'secondary source,' and 'artifact' which are appropriate technical terms for social studies. Choice C is correct because Yuki uses domain vocabulary like 'primary source,' 'secondary source,' and 'artifact' which correctly and precisely describe concepts in social studies, instead of vague words. Choice A is incorrect because it suggests vague replacements instead of more precise domain vocabulary; students sometimes suggest vague replacements instead of more precise domain vocabulary. To help students use precise language and domain-specific vocabulary: build domain vocabulary explicitly for each subject unit; create word walls with science terms, social studies terms, math terms—display with definitions; teach technical terms directly before writing: 'When explaining water cycle, use these precise terms: evaporation (liquid→vapor), condensation (vapor→liquid), precipitation (water falling)—not vague words like “water goes up” or “water comes down”'; model replacing vague with precise: 'I wrote “The animal lives in a place.” Too vague! Replace: “The arctic fox inhabits the tundra habitat.” Now I used domain vocabulary: inhabits, tundra, habitat.'; practice precision substitutions: give sentences with vague language, students replace with domain terms ('The rock formed from hot stuff' → 'The igneous rock formed from cooled lava'). Emphasize precision purpose: 'Domain vocabulary makes your explanation clearer; “evaporation” tells exactly what happens—“water going up” is vague'; compare vague vs precise examples side-by-side; teach subject-appropriate terms: science topics need science vocabulary, social studies topics need social studies terms; provide vocabulary banks during writing; give feedback: 'Replace “stuff” with domain vocabulary: “adaptations”' or 'Use precise term “hemisphere” instead of “half of Earth”'; practice reading informational text, identify domain vocabulary authors use; teach correct usage: 'Predator hunts prey, not reversed; predator is the hunter, prey is hunted'; encourage defining terms: 'Metamorphosis—the transformation from larva to adult—takes weeks'; watch for: students who use vague words like 'stuff,' 'things,' 'place' instead of technical terms; students who avoid domain vocabulary because unfamiliar; students who use everyday language ('water going up') instead of technical terms ('evaporation'); students who mix precise and vague in same writing; students who use technical terms incorrectly; students who don't understand that domain vocabulary varies by subject; students who think any descriptive word is precise; students who don't define technical terms when introducing them; teach explicitly: informational writing uses subject-specific vocabulary to be clear and accurate.

This question tests 4th grade informational/explanatory writing skills: using precise language and domain-specific vocabulary to inform about or explain the topic (CCSS.W.4.2.d). Informational and explanatory writing should use precise language and domain-specific vocabulary—this means using technical terms appropriate to the subject area instead of vague, everyday words; domain-specific vocabulary includes technical terms from the subject like science (habitat, adaptation, metamorphosis, predator, prey, evaporation, condensation, friction, orbit, precipitation), social studies (hemisphere, representative, peninsula, primary source, citizen, democracy), or math (perimeter, numerator, variable, parallel); precise vs vague: precise = 'The carnivore hunts prey in its habitat' (technical terms: carnivore, prey, habitat make meaning clear); vague = 'The animal that eats meat finds food where it lives' (everyday words, less precise); precise = 'Evaporation occurs when liquid water becomes water vapor' (technical: evaporation, liquid, water vapor); vague = 'Water goes up into the air when it gets hot' (general words); why it matters: domain vocabulary makes explanations clearer and more accurate, shows understanding of subject, provides specific, exact meaning, and is standard in each field (scientists say 'evaporation' not 'water going up'); using precise, subject-specific language is important in informational writing to communicate accurately. Emma writes about the water cycle in science; the explanation uses precise language and domain-specific vocabulary such as 'evaporation,' 'condensation,' 'precipitation,' and 'atmosphere' which are appropriate technical terms for science. Choice A is correct because Emma uses precise language and domain-specific vocabulary—technical terms like 'evaporation,' 'condensation,' 'precipitation,' and 'atmosphere' are appropriate for science and make the explanation clear and accurate. Choice B is incorrect because it accepts vague words like 'heats up' or 'turns' as precise vocabulary when domain-specific terms would be more accurate; students sometimes use everyday language ('water going up') instead of domain vocabulary ('evaporation'). To help students use precise language and domain-specific vocabulary: build domain vocabulary explicitly for each subject unit; create word walls with science terms, social studies terms, math terms—display with definitions; teach technical terms directly before writing: 'When explaining water cycle, use these precise terms: evaporation (liquid→vapor), condensation (vapor→liquid), precipitation (water falling)—not vague words like “water goes up” or “water comes down”'; model replacing vague with precise: 'I wrote “The animal lives in a place.” Too vague! Replace: “The arctic fox inhabits the tundra habitat.” Now I used domain vocabulary: inhabits, tundra, habitat.'; practice precision substitutions: give sentences with vague language, students replace with domain terms ('The rock formed from hot stuff' → 'The igneous rock formed from cooled lava'). Emphasize precision purpose: 'Domain vocabulary makes your explanation clearer; “evaporation” tells exactly what happens—“water going up” is vague'; compare vague vs precise examples side-by-side; teach subject-appropriate terms: science topics need science vocabulary, social studies topics need social studies terms; provide vocabulary banks during writing; give feedback: 'Replace “stuff” with domain vocabulary: “adaptations”' or 'Use precise term “hemisphere” instead of “half of Earth”'; practice reading informational text, identify domain vocabulary authors use; teach correct usage: 'Predator hunts prey, not reversed; predator is the hunter, prey is hunted'; encourage defining terms: 'Metamorphosis—the transformation from larva to adult—takes weeks'; watch for: students who use vague words like 'stuff,' 'things,' 'place' instead of technical terms; students who avoid domain vocabulary because unfamiliar; students who use everyday language ('water going up') instead of technical terms ('evaporation'); students who mix precise and vague in same writing; students who use technical terms incorrectly; students who don't understand that domain vocabulary varies by subject; students who think any descriptive word is precise; students who don't define technical terms when introducing them; teach explicitly: informational writing uses subject-specific vocabulary to be clear and accurate.