Across
- 3. known as NO2
- 4. storage deposits
- 8. circulation of carbon atoms
- 10. a key limiting factor in ecosystems
- 11. carbon is a - process
Down
- 1. happens in the carbon cycle by CO2
- 2. nitrogen is a -source In the environment
- 5. provides freshwater for bio life
- 6. Circulation of nitrogen
- 7. most water evaporated here
- 9. NH3 is known as