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Science Review

Grade 4 · On-level practice · 10 questions · Version PG-VHM4YG-102C

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1.Why do seasons occur?
2.What cell structure contains genetic material?
3.What is the difference between weather and climate?
4.What type of boundary forms when plates move apart?
5.Which layer of Earth is liquid iron and nickel?
6.How do greenhouse gases warm Earth?
7.Why are food webs more realistic than single food chains?
8.What is the role of chlorophyll?
9.What is density?
10.State Newton's third-law force pair when swimming.

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 5
  1. Why do seasons occur?Earth's tilt as it orbits the Sun
  2. What cell structure contains genetic material?The nucleus
  3. What is the difference between weather and climate?Weather is short-term; climate is long-term patterns
  4. What type of boundary forms when plates move apart?Divergent boundary
  5. Which layer of Earth is liquid iron and nickel?Outer core
  6. How do greenhouse gases warm Earth?They absorb and re-emit infrared energy
  7. Why are food webs more realistic than single food chains?Organisms have multiple food sources and predators
  8. What is the role of chlorophyll?Absorb light for photosynthesis
  9. What is density?Mass per unit volume
  10. State Newton's third-law force pair when swimming.Push water back; water pushes swimmer forward

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.