Nutrient Cycles

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Across
  1. 2. what us the main regulator of CO2 in the atmosphere
  2. 4. basins some phosphorus in soil is washed away into
  3. 5. animal waste decay by the action of bacteria creates
  4. 8. this kind of bacteria in the soil can break down the ammonia in the form of
  5. 9. huge deposits of of carbon were stored as plants and animals that are what
  6. 11. gases deposits are burned as fossil fuels which include
  7. 13. plants use CO2 in the process of what
  8. 14. What percentage is of the atmosphere is nirtogen gas
  9. 15. phosphorus in water
  10. 16. higher organisms use nitrogen to make what
  11. 18. too much CO2 me all the atmosphere may be responsible for what effect
  12. 19. plants and animals cannot use nitrogen found directly here
Down
  1. 1. too much phosphorus in water causes plants too
  2. 3. humans add this with bad nitrogen in it, hurting the atmosphere
  3. 6. phosphorus is mostly found in
  4. 7. natural source for CO2
  5. 10. it is a essential for life
  6. 12. animals use this to make more CO2
  7. 14. plants use what in the process of photosynthesis
  8. 17. animal waste decay by the action of bacteria, which create ammonia and what