Across
- 3. non living things
- 6. fuels release carbon when burned
- 7. present in the atmosphere as CO2
- 9. conversion of ammonia to nitrite
- 14. phosphorus is released through ______ of rocks
- 15. solid to gas
- 16. liquid to gas
- 18. gas to liquid
- 20. decomposers
- 21. cycle water cycle
- 22. nitrate back to nitrogen gas
- 23. cycled in the ecosystem
Down
- 1. a source of energy that contains phosphate
- 2. vulture
- 3. process that releases nitrogen back to the soil
- 4. living things
- 5. food chain that consists of producers and consumers
- 8. presence of substances in excessive quantities
- 10. decreases by 10% at each trophic level
- 11. equilibrium
- 12. scarcest element in nature
- 13. water from plants turn to vapor
- 17. web complex network
- 19. nitrogen is converted into ammonia