Across
- 3. The hardest coal
- 4. Fuel that is made from living organisms
- 7. Decay of things like algae requires what?
- 8. Where most of the freshwater on earth is locked
- 10. As pressure increases, so does
- 11. Transpiration which releases water from these
- 14. The main chemical compound found in fossil fuels
- 15. Wearing away of rock into sediment
- 16. Educated guesses
- 18. Smoke plus fog
Down
- 1. Type of oil that is a synonym for petroleum
- 2. The sun and what drive biochemical cycles?
- 5. Water vapor changes to liquid water
- 6. Cycle of nutrients like carbon, oxygen, and phosphorus
- 9. The process which turns light into energy
- 12. With fertilizer, is a nonliving nitrogen fixer
- 13. The layer of carbon dioxide that keeps carbon dioxide from escaping our atmosphere
- 17. A synonym for poisons