Cycles in Ecosystems

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Across
  1. 4. this process releases water vapour from oceans
  2. 9. a process which releases carbon dioxide out of fossil fuels
  3. 10. plants which are commonly associated with nitrogen-fixing bacteria
  4. 11. this reduces the amount of nitrate in the soil
  5. 12. water vapour can be released from plants by this process
  6. 13. how animals and plants release carbon dioxide into the atmosphere
Down
  1. 1. this occurs to dead organisms when decay is prevented
  2. 2. an animal source of nitrogen
  3. 3. the organisms which release ammonia or carbon dioxide from detritus
  4. 5. nitrifying bacteria turn this into nitrite
  5. 6. how water is released from the atmosphere to fall on earth
  6. 7. this reduces carbon dioxide levels in the atmosphere
  7. 8. the carbon-rich molecule produced during photosynthesis