Across
- 2. Carbon is the blank most abundant element in the universe
- 3. serious of events that are periodically repeated
- 6. Plants and animals need this
- 7. Organism that uses CO2 during photosynthesis
- 10. a process by which organisms use nitrogen to create amino acids and proteins
- 13. organisms create waste or die and then nitrogen is put back into the ecosystem
- 15. Carbon moving from living things to the atmosphere
- 16. Carbon can be found in the blank we eat
- 18. The water on the Earths surface
- 20. CO2 is a waste product made by blanks during cellular respiration
Down
- 1. Carbon can be found in blank material such as rocks
- 4. organisms break down (decay)
- 5. Carbon helps provide power and is found in our main sources of blank
- 8. the area of gasses around the planet
- 9. the remains of living organisms turned into fuel such as gas
- 11. Carbon is in our blank
- 12. the regions of Earth plants and animals live
- 14. Solid part of the planet that is like the crust
- 17. Biggest carbon reservoir on Earth
- 19. plants and animals are made up of blank compounds