Across
- 2. energy using turbines
- 4. fuel from ancient organisms
- 6. use again
- 7. bond with hydrogen and carbon
- 8. energy from earth’s heat
- 10. use less
- 11. provides energy
Down
- 1. from living things
- 3. from sun
- 5. from water
- 9. black liquid fuel
- 10. plenty make more