Across
- 1. rain, sleet, snow
- 4. process by which atmospheric N2 is converted to ammonia by organisms
- 5. conversion of nitrate into dinitrogen oxide gas
- 8. process by which producers incorporate elements into their tissues
- 10. decomposers break down organic matter into ammonia
- 11. conversion of ammonia into nitrite and nitrate
- 12. burning fossil fuels to release carbon dioxide
Down
- 2. water that percolates through soil
- 3. producers form sugar from carbon dioxide and water
- 6. release of water from leaves during photosynthesis
- 7. organisms use sugar for cellular processes and form carbon dioxide and water
- 9. water that moves across the land surface