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Science Review

Grade 4 · On-level practice · 10 questions · Version PG-1LSPC2C-102C

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1.What does conservation of energy mean?
2.What cell structure contains genetic material?
3.Which layer of Earth is liquid iron and nickel?
4.What is the pH of a neutral solution?
5.Why does salt lower water's freezing point?
6.What is the difference between weather and climate?
7.What is the role of chlorophyll?
8.How do greenhouse gases warm Earth?
9.Which blood cells fight infection?
10.What type of boundary forms when plates move apart?

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 18
  1. What does conservation of energy mean?Energy changes form but is not created or destroyed
  2. What cell structure contains genetic material?The nucleus
  3. Which layer of Earth is liquid iron and nickel?Outer core
  4. What is the pH of a neutral solution?7
  5. Why does salt lower water's freezing point?It disrupts ice crystal formation
  6. What is the difference between weather and climate?Weather is short-term; climate is long-term patterns
  7. What is the role of chlorophyll?Absorb light for photosynthesis
  8. How do greenhouse gases warm Earth?They absorb and re-emit infrared energy
  9. Which blood cells fight infection?White blood cells
  10. What type of boundary forms when plates move apart?Divergent boundary

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.