Nitrogen Cycle

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Across
  1. 5. the organism that is responsible for fixing nitrogen
  2. 6. animals get nitrogen by ______ plants
  3. 7. nitrogen is change into two forms plants can use, nitrites and _____.
  4. 10. too much nitrous oxide in the air can cause this
  5. 11. nitrogen needs to be ____ for plants to be able to use it
  6. 13. nitrogen-fixers can live on this part of plants
  7. 14. the process when plants absorb nitrogen from the soil
Down
  1. 1. nitrogen in the air is not _____ to plants
  2. 2. the process when extra nitrogen in the soil is released back into the air
  3. 3. this adds too much nitrogen to the ground and hurts the nitrogen cycle
  4. 4. animals help put nitrogen into the soil through their _____ products
  5. 8. nitrogen goes through many of these during the nitrogen cycle
  6. 9. a colorless, odorless gas that makes up about 78% of our atmosphere
  7. 12. nitrogen is important in living things to help make this