Across
- 6. the break down of dead stuff into ground
- 8. process plants & algae remove CO2
- 11. another carbon based gas
- 12. the burning of fossil fuels
Down
- 1. organisms that do photosynthesis
- 2. oceans and forest main reservoir of carbon
- 3. the main gas in the carbon cycle
- 4. process all organisms release CO2
- 5. organisms that cannot do photosynthesis
- 7. carbon based resource used for energy
- 9. the way fossil fuels are removed
- 10. natural source of CO2 to atmosphere
- 13. the sinking of sediments over time