Across
- 6. a strong chemical bond in fuels
- 7. process of burning a fuel
- 8. a resource that can be used again
- 10. a car that uses gas and battery together
- 13. invisible fossil fuel
- 14. 26th US president
- 19. oil drilling spill in 2010
- 20. wrote "silent spring"
Down
- 1. organization that makes laws
- 2. alaska oil spill in 1989
- 3. a naturalist and author
- 4. solid fossil fuel
- 5. energy from under the earth
- 9. energy from living organisms
- 11. machine used to collect wind energy
- 12. another name for oil
- 15. liquid fossil fuel
- 16. energy from the sun
- 17. energy from water
- 18. we collect solar energy using this