Nutrients cycle

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Across
  1. 3. Phosphorus makes up this important chemicals
  2. 4. What does to much phosphorus lead to in plants
  3. 6. How humans release CO2 into the atmosphere
  4. 8. How water returns to the ground in the water cycle
  5. 11. What is created by the decay of animal waste
  6. 12. activity Examples are mining and burning fossil fuels
  7. 15. What makes up 78% of the atmosphere
  8. 17. The process plants use to make sugar
  9. 18. Examples are volcanic eruptions and rock formation
  10. 19. The main regulator of CO2
Down
  1. 1. The main source of natural CO2
  2. 2. Main source of phosphorus from man
  3. 5. The process how animals use oxygen
  4. 7. Mostly contained in rocks and minerals
  5. 9. Activities performed by living organisms
  6. 10. Returns nitrogen to the soil
  7. 13. Eat plants that contain nitrogen
  8. 14. What do organisms use nitrogen for
  9. 15. Product rich in nitrogen
  10. 16. Chemical substances organisms need to sustain life