Carbon Cycle

2. all of them contain atoms of carbon
5. keeps the Earth warm and insulates it from the deep cold of space
7. oil, coal, and natural gas
8. taken in by plants and used to build molecules of glucose
11. take in carbon dioxide and use it during photosynthesis
12. too much heat being trapped by the atmosphere by the greenhouse effect
15. carried out by autotrophs and heterotrophs to break down glucose into carbon dioxide and water
17. present in the atmosphere in the form of carbon dioxide

1. industrial society depends on energy that comes from burning these
3. formed by marine organisms by combining carbon, calcium, and oxygen
4. removes carbon dioxide from the atmosphere
6. responsible for a dramatic increase in atmospheric carbon dioxide
9. a large storage area for carbon
10. key element of all organic compounds
13. returns carbon dioxide to the atmosphere
14. concentration in the atmosphere has dramatically increased over the last 150 years
16. supply of carbon needed to build new organic compounds