Across
- 1. compound with only carbon and hydrogen
- 4. energy derived from the interior heat of the earth
- 5. a machine that converts mechanical energy to electrical energy
- 7. a flammable yellow-black liquid
- 9. incoming solar radiation
- 10. liquid fuel produced from processed or refined biomass
- 11. natural fuel such as coal or gas
- 13. nuclear reaction in which a nucleus splits
- 15. partially decayed plant matter
- 17. flammable gas consisting of methane or other hydrocarbons
- 18. the amount of biologically productive land and sea available to us
- 19. solar energy from curved reflectors
Down
- 1. electricity generated by the movement of water
- 2. consumed more rapidly than it's produced
- 3. combustible dark or black rock
- 6. the ability to do work
- 8. naturally produces faster than it can deplete
- 12. a naturally occuring element used in nuclear power plants
- 14. a reaction where nuclei are forced together
- 16. the impact of a person on a community or environment