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Science Review

Grade 4 · Stretch challenge · 10 questions · Version PG-11U6KRE-DBMY

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1.What is density?
2.What is the pH of a neutral solution?
3.Which layer of Earth is liquid iron and nickel?
4.What cell structure contains genetic material?
5.State Newton's third-law force pair when swimming.
6.What evidence shows a chemical reaction occurred?
7.What type of boundary forms when plates move apart?
8.What does conservation of energy mean?
9.Why are food webs more realistic than single food chains?
10.What is the difference between weather and climate?

Answers and teaching notes

Use the answers to check the work after the learner finishes. For writing prompts, the guide describes what a strong response should include.

Show answers for version 7
  1. What is density?Mass per unit volume
  2. What is the pH of a neutral solution?7
  3. Which layer of Earth is liquid iron and nickel?Outer core
  4. What cell structure contains genetic material?The nucleus
  5. State Newton's third-law force pair when swimming.Push water back; water pushes swimmer forward
  6. What evidence shows a chemical reaction occurred?New substances form
  7. What type of boundary forms when plates move apart?Divergent boundary
  8. What does conservation of energy mean?Energy changes form but is not created or destroyed
  9. Why are food webs more realistic than single food chains?Organisms have multiple food sources and predators
  10. What is the difference between weather and climate?Weather is short-term; climate is long-term patterns

Worked example

Connect the question to an observable process or scientific model.

Common mistake

Selecting a familiar term without checking its meaning.

Helpful hint

Explain why your answer makes sense.