Across
- 5. means to reduce energy use
- 6. energy-rich substance formed from the remains of organisms (coal, oil, natural gas)
- 8. chemical compounds that contain carbon and hydrogen atoms
- 9. burning
- 12. a way to conserve energy
- 14. oil
- 16. energy from the sun
- 17. electricity produced by flowing water
- 20. nucleus split apart
Down
- 1. a change from one form of energy into another
- 2. the part of the nuclear reactor where nuclear fission occurs
- 3. energy from heat in Earth
- 4. compounds made from oil
- 7. nuclei combined
- 10. rods that contain U-235
- 11. fuels made from living things
- 13. when fuel rods generate so much heat they begin to melt
- 15. a substance that provides energy
- 18. the percentage of energy that is actually used to perform work
- 19. a factory where crude oil is heated and separated into other products