Grade 3 · Science · Challenge
Free Science Review worksheet - version 10
Grade 3 science review matched to the learner's current level. This printable version includes 10 grade-appropriate questions and a separate answer sheet.
Science Review
Grade 3 · Stretch challenge · 10 questions · Version PG-J1GIA3-1LFG
1.How do greenhouse gases warm Earth?
2.Which blood cells fight infection?
3.Which layer of Earth is liquid iron and nickel?
4.What is the role of chlorophyll?
5.Why does salt lower water's freezing point?
6.What is density?
7.What cell structure contains genetic material?
8.State Newton's third-law force pair when swimming.
9.Why do seasons occur?
10.What evidence shows a chemical reaction occurred?
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 10
- How do greenhouse gases warm Earth?They absorb and re-emit infrared energy
- Which blood cells fight infection?White blood cells
- Which layer of Earth is liquid iron and nickel?Outer core
- What is the role of chlorophyll?Absorb light for photosynthesis
- Why does salt lower water's freezing point?It disrupts ice crystal formation
- What is density?Mass per unit volume
- What cell structure contains genetic material?The nucleus
- State Newton's third-law force pair when swimming.Push water back; water pushes swimmer forward
- Why do seasons occur?Earth's tilt as it orbits the Sun
- What evidence shows a chemical reaction occurred?New substances form
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.