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