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Earth, Space & Weather

Grade 2 · Stretch challenge · 8 questions · Version PG-1PS2D9I-1NUH

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1.Explain “front” in your own words.
2.Explain “rock cycle” in your own words.
3.Explain “plate tectonics” in your own words.
4.Explain “renewable resource” in your own words.
5.Explain “water cycle” in your own words.
6.Explain “atmosphere” in your own words.
7.Explain “groundwater” in your own words.
8.Explain “fossil” in your own words.

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 14
  1. Explain “front” in your own words.a boundary between air masses
  2. Explain “rock cycle” in your own words.processes that transform rocks among major types
  3. Explain “plate tectonics” in your own words.the movement of large sections of Earth's crust
  4. Explain “renewable resource” in your own words.a resource replenished naturally on a human timescale
  5. Explain “water cycle” in your own words.the continuous movement of water on Earth
  6. Explain “atmosphere” in your own words.the layer of gases surrounding Earth
  7. Explain “groundwater” in your own words.water stored in soil and rock below the surface
  8. Explain “fossil” in your own words.preserved evidence of past life

Worked example

Use observations and long-term patterns to explain Earth systems.

Common mistake

Confusing a short-term weather event with a climate pattern.

Helpful hint

Check the time scale in the question.