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Environment

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Across
  1. 3. in the correct proportions
  2. 6. chemical substances for washing things
  3. 11. result of a drought
  4. 15. dangerous gaz
  5. 17. action of clearing a wide area of trees
  6. 18. disposed
  7. 20. make a difference to
  8. 21. made impure
Down
  1. 1. damage caused to soil, water, air...
  2. 2. ruined
  3. 3. capable of being decomposed
  4. 4. chemical element of atomic number 6
  5. 5. variety of plant and animal
  6. 6. to reduce
  7. 7. power from something
  8. 8. production and discharge of something
  9. 9. weather conditions
  10. 10. biological community
  11. 12. ceased to exist
  12. 13. unwanted matter or material
  13. 14. a large amount of water covering an area
  14. 16. close to extinction
  15. 19. no longer in existence