Nutrient cycle

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Across
  1. 2. this is not found in a free state in nature
  2. 4. too much CO2 in the atmosphere can be responsible for this
  3. 6. this type of animals stores carbon
  4. 8. this bacteria is used to break down ammonia into gaseous nitrogen
  5. 11. plants go through this process to make sugar
  6. 12. this is needed to make proteins
  7. 16. man made phosphorus in water
  8. 17. plants and animals can’t use all the nitrogen in this
  9. 20. animal waste decay creates this
Down
  1. 1. the percentage of nitrogen gas in our atmosphere
  2. 3. this is the main regulator of CO2 in the atmosphere
  3. 5. the kind of cycle this chapter is about
  4. 7. places phosphorus from soil can be washed away
  5. 9. volcanoes are a natural source of this
  6. 10. too much phosphorus in water leads to plant…..
  7. 13. animals use this in the process of respiration
  8. 14. phosphorus can be contained in this
  9. 15. along with rocks, phosphorus can be contained in this
  10. 18. plants go through photosynthesis to make this
  11. 19. this is essential nutrient for life as it makes up important chemicals