biology unit 9

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