Across
- 6. nitrates into nitrogen gas
- 8. water evaporation from plant leaves
- 9. most important organism in the carbon cycle
- 10. animals use oxygen n release carbon dioxide
Down
- 1. liquid to gas
- 2. water that flows over the ground
- 3. composes 78% of atmosphere gas
- 4. most important organism in the nitrogen cycle
- 5. plants use carbon dioxide to do this
- 7. combustion releases...