pollution and farming

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Across
  1. 5. the draining away of water from a surface of land
  2. 9. the number of people in a certain place
  3. 10. another word for farming
  4. 13. the cultivation of aquatic plants for food
  5. 14. to keep something t he same or keep it for a long time
  6. 15. things that pollute
  7. 17. when a rock layer moves
  8. 18. a way of farming that helps during droughts
  9. 20. the reason for climate change
Down
  1. 1. gases- Gases that pollute our earth very much
  2. 2. things that we use to live, natural or industrial
  3. 3. something that is fit for growing food on
  4. 4. our earth's protection from the sun that has a whole in it
  5. 6. air act- a law that is designed to control air pollution
  6. 7. things that pollute a lot and will eventually run out like coal
  7. 8. cars, planes and trains are all examples
  8. 11. a biological community of organisms and their physical envoirnment
  9. 12. very dirty air because of pollution
  10. 16. a lack of water in a place
  11. 19. change- the earth is getting warmer because of us