biology unit 9

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Across
  1. 2. action of clearing a large area of trees
  2. 5. where fresh water meets salt water
  3. 7. harmful material
  4. 8. chemical used to kill insects
  5. 10. species that dies out/no longer exists
  6. 13. impact of a person or community on the environment
  7. 14. coal, oil, natural gas and other fuels that are remains of organisms
  8. 15. measure of human impact on environment
  9. 16. convert waste into reusable material
  10. 17. forms in atmosphere when gas emissions combine with water
  11. 19. chemical used to kill insects and other organisms that damage crops
  12. 20. group of chemical compounds used in refrigerators
  13. 21. species who is at risk of extinction
Down
  1. 1. raising marine and freshwater fish in ponds and underwater cages
  2. 3. development of industries for machine production of goods
  3. 4. increase of things living in an area
  4. 6. breakup of a habitat into smaller pieces
  5. 9. largest number of a population an environment can support
  6. 11. process where fertile land becomes desert due to drought or deforestation
  7. 12. protecting and preserving natural resources and the environment
  8. 18. protective layer in atmosphere that shields earth from uv radiation