Across
- 3. higher organisms use nitrogen to make their…
- 7. water that is in the ground
- 10. we add nitrogen to soil by using…
- 11. what is the main regulator of CO2 in the atmosphere
- 14. groundwater taken to the atmosphere
- 17. rain, snow, sleet, or hail
- 19. the process from turning liquid into vapor
- 20. animals use oxygen in this process to make more CO2…
- 21. another natural source for CO2 is…
Down
- 1. phosphorus is not found in the free state in nature but is found in rocks and…
- 2. another source of phosphorus in water comes from man made…
- 4. too much CO2 in the atmosphere may be responsible for…
- 5. eight our atmosphere is how many percent nitrogen gas
- 6. bacteria in the soil can break down ammonia into the gaseous form of nitrogen
- 8. some of the phosphorus in soils can be washed into water…
- 9. to much phosphorus can lead to plant…
- 12. plants use CO2 in the process of photosynthesis to make
- 13. conversion of vapor to a liquid
- 15. animal waste and decay by the action of bacteria create ammonia and…
- 16. it is essential because it helps make up an impact chemical called…
- 18. animals and plants can not directly use nitrogen found in our…