Grade 3 · Science · Challenge
Free Science Review worksheet - version 13
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-JBG3Z2-1LFG
1.How do greenhouse gases warm Earth?
2.What is the pH of a neutral solution?
3.Why does salt lower water's freezing point?
4.What type of boundary forms when plates move apart?
5.Why do seasons occur?
6.Why are food webs more realistic than single food chains?
7.Which layer of Earth is liquid iron and nickel?
8.What cell structure contains genetic material?
9.What is the role of chlorophyll?
10.Which blood cells fight infection?
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 13
- How do greenhouse gases warm Earth?They absorb and re-emit infrared energy
- What is the pH of a neutral solution?7
- Why does salt lower water's freezing point?It disrupts ice crystal formation
- What type of boundary forms when plates move apart?Divergent boundary
- Why do seasons occur?Earth's tilt as it orbits the Sun
- Why are food webs more realistic than single food chains?Organisms have multiple food sources and predators
- Which layer of Earth is liquid iron and nickel?Outer core
- What cell structure contains genetic material?The nucleus
- What is the role of chlorophyll?Absorb light for photosynthesis
- Which blood cells fight infection?White blood cells
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.