Earth, Water, Air, Pollution, and Crossword puzzles.

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Across
  1. 4. colorless odorless toxic gas made of 3 oxygen atoms that's good low down and bad high up
  2. 6. haze or mist mixed with smoke or ozone
  3. 9. growing food
  4. 10. process of moving from one point to another
  5. 12. amount of humans on earth
  6. 14. amount of organic material in a given area
  7. 15. natural fuels like coal and gasoline
  8. 18. useful items or materials from the environment
  9. 19. bottle made to purify water
  10. 21. the transformation of fertile land into desert
Down
  1. 1. acid falling from the sky
  2. 2. the introduction or presence of something harmful to the environment
  3. 3. farm land must be...
  4. 5. hole in the ozone layer caused by aerosol
  5. 7. gases that contribute to the greenhouse effect
  6. 8. making steps in the dirt to prevent runoff
  7. 11. a biological community of interacting organisms and their physical environment
  8. 13. amount of people living in a given area
  9. 16. colorless smelly gas that is released when fossil fuels are burnt
  10. 17. the gradual destruction or diminution of something
  11. 20. organic material from dirt that transports into water