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Science Review

Grade 4 · On-level practice · 10 questions · Version PG-1M2OXRB-102C

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1.What is density?
2.What transfers traits from parents to offspring?
3.What is the difference between weather and climate?
4.Why does salt lower water's freezing point?
5.What type of boundary forms when plates move apart?
6.What cell structure contains genetic material?
7.What is the pH of a neutral solution?
8.How do greenhouse gases warm Earth?
9.State Newton's third-law force pair when swimming.
10.Why do seasons occur?

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 19
  1. What is density?Mass per unit volume
  2. What transfers traits from parents to offspring?Genes
  3. What is the difference between weather and climate?Weather is short-term; climate is long-term patterns
  4. Why does salt lower water's freezing point?It disrupts ice crystal formation
  5. What type of boundary forms when plates move apart?Divergent boundary
  6. What cell structure contains genetic material?The nucleus
  7. What is the pH of a neutral solution?7
  8. How do greenhouse gases warm Earth?They absorb and re-emit infrared energy
  9. State Newton's third-law force pair when swimming.Push water back; water pushes swimmer forward
  10. Why do seasons occur?Earth's tilt as it orbits the Sun

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.