Cycles in Ecosystems

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