Nutrient Cycles

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Across
  1. 3. In the Phosphorus Cycle, phosphorus moves between the soil and this
  2. 4. Higher organisms use nitrogen to make this
  3. 10. This can directly use nitrogen in our atmosphere
  4. 11. Phosphorus is contained in these
  5. 13. This effect is caused by too much CO2 in the atmosphere
  6. 14. Animals use this in the process of respiration to make more CO2
  7. 15. Animal waste is returned to this
  8. 16. A source of phosphorus in water comes from this
  9. 17. Plants use this in photosynthesis to make sugar and oxygen
  10. 18. Phosphorus in soils can be washed away into these
  11. 20. Animals and plants cannot directly use all the nitrogen found in this
Down
  1. 1. Products rich in nitrogen
  2. 2. The process plants use to make sugar and oxygen
  3. 5. Too much phosphorus in water leads to this
  4. 6. Our atmosphere is 78% of this
  5. 7. This is not found in the free state of nature
  6. 8. This is the main regulator of CO2 in the atmosphere because CO2 dissolves easily in it
  7. 9. An important chemical made up of Phosphorus
  8. 12. This is a natural source for CO2
  9. 19. These eat plants containing nitrogen