Our wonderful world.

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Across
  1. 3. up — To make a place clean.
  2. 4. — Animals that live in nature.
  3. 6. — We breathe this.
  4. 7. — A very big sea.
  5. 8. — To stop something from happening.
  6. 12. — The world around us.
  7. 15. — To keep safe.
  8. 18. — A material used to make bags and bottles.
  9. 19. — The usual weather in a place.
Down
  1. 1. — Dirty air, water, or land.
  2. 2. — To go away or cannot be seen.
  3. 5. — To hurt or break something.
  4. 9. — Power to do things.
  5. 10. — To hurt something with fire.
  6. 11. — To use old things again.
  7. 13. — Plants, animals, and the outdoors.
  8. 14. — To use too much or throw away.
  9. 16. — Things we throw away.
  10. 17. — To make air, water, or land dirty.
  11. 20. after — To take care of someone or something.