Shea Kalina 10/21

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Across
  1. 4. get food from soil and air
  2. 5. total number of people in an area
  3. 7. dead organism returns to the earth
  4. 12. get food from producers or other living things
  5. 13. study of human population
  6. 14. to be living or living before
  7. 15. the increase of a toxin in a foodchain
  8. 19. not living, dead for long period
  9. 20. when the algae in the water makes it seem red
  10. 23. also known as the water cycle
  11. 24. to leave where you were once native
  12. 25. main source of energy on earth
Down
  1. 1. burning the forests for whatever reason
  2. 2. important to living tissue, element, organic
  3. 3. when water goes into the atmosphere
  4. 6. what living things need to survive
  5. 8. when ammonia is made into NO2 then NO3
  6. 9. when the birth rate=death and immigration=emigration
  7. 10. organism breaks down
  8. 11. when it rains
  9. 16. when the atmosphere traps solar radiation
  10. 17. the maximum amount an ecosystem can support
  11. 18. when water becomes clouds
  12. 21. move somewhere you were not native before
  13. 22. natural process in ecosystem