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