Across
- 3. Energy obtained from underground steam
- 6. Energy obtained from falling water
- 7. substitute for dwindling petroleum supplies
- 10. law that protects the water
- 13. Energy obtained from the air
- 14. pollution coming from unknown location
- 15. Can be replenished over a short time
- 16. energy provided by the sun
- 18. law that protects the air
- 19. pollution coming from a known location
Down
- 1. primarily used by power plants
- 2. process that conserves forest resources
- 4. Hydrocarbons used as fuel
- 5. Energy obtained from the sea
- 8. energy obtained from radioactive materials
- 9. water that carries non point source pollution
- 11. takes millions of years to form and accumulate
- 12. careful use of resources
- 17. it forms from the remains of plants and animals