Review, Review, Review

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Across
  1. 2. planet Earth's main source of heat and light
  2. 5. what do cows bring out of their stomach and chew?
  3. 9. use things more than once
  4. 10. rain caused by pollution
  5. 11. the cutting down of trees
  6. 13. a volcano that has not erupted for a long time, but could
  7. 15. the world around us
  8. 16. gas that plants give out
  9. 18. harmful things that factories put into the environment
  10. 20. from the movement of the sea
Down
  1. 1. food which is bad for the environment
  2. 3. a volcano that could erupt at any time
  3. 4. part of a cows stomach
  4. 5. gas that plants take in
  5. 6. what comes erupts out of a volcano
  6. 7. what do cars use for fuel?
  7. 8. the hole at the top of a volcano
  8. 12. a volcano that will never erupt again
  9. 14. power from the sun
  10. 17. under the earth's crust
  11. 19. how many stomachs does a cow have?