Across
- 2. a gas we need and plants release it
- 8. resources that eventually run out
- 10. chemical compounds that contain carbon and hydrogen atoms (p.293)
- 11. example of biomass
- 14. the most plentiful fossil fuel in the U.S.
- 15. most of Earth's energy comes from this
- 17. a compound made from oil (p.297)
- 19. power energy created by moving water
- 21. the ability to do work or cause change
- 22. fuel made from living things
- 23. energy can be created from this element
- 24. energy energy created by the sun
Down
- 1. resources that do not run out
- 3. gas a mixture of methane and other gases (p.298)
- 4. another word for oil
- 5. heat from Earth's interior that generates electricity
- 6. to save energy is to __________ it
- 7. a gas plentiful in cow pastures
- 9. another name for solar cells (p.301)
- 12. what oil is called when it's pumped straight out of the ground (p.297)
- 13. alcohol + gas
- 16. fuel made from dead plants
- 18. energy created from the splitting of atoms
- 20. place where crude oil is heated and separated into fuels and other products (p.297)