Grade 3 · Science · Challenge
Free Science Review worksheet - version 8
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-1Y6738E-1LFG
1.How do greenhouse gases warm Earth?
2.What is the difference between weather and climate?
3.Why are food webs more realistic than single food chains?
4.Why does salt lower water's freezing point?
5.Which layer of Earth is liquid iron and nickel?
6.What transfers traits from parents to offspring?
7.What does conservation of energy mean?
8.Why do seasons occur?
9.What is density?
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 8
- How do greenhouse gases warm Earth?They absorb and re-emit infrared energy
- What is the difference between weather and climate?Weather is short-term; climate is long-term patterns
- Why are food webs more realistic than single food chains?Organisms have multiple food sources and predators
- Why does salt lower water's freezing point?It disrupts ice crystal formation
- Which layer of Earth is liquid iron and nickel?Outer core
- What transfers traits from parents to offspring?Genes
- What does conservation of energy mean?Energy changes form but is not created or destroyed
- Why do seasons occur?Earth's tilt as it orbits the Sun
- What is density?Mass per unit volume
- 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.