Across
- 2. produced from the earth with no chemicals
- 3. between fuel and oxidant.
- 5. underground layer of water
- 8. or seas
- 9. in the carbon cycle
- 10. Source Pollution- Runoff
Down
- 1. process of carbon
- 4. Source Pollution- discharged contaminants
- 6. exchange of oxygen and Co2
- 7. sinks-natural or artificial reservoirs