Across
- 3. the percentage of energy that is actually used to perform work
- 11. another name for oil
- 12. electricity made by flowing water
- 14. a change from one form of energy to another
- 15. the part of the nuclear reactor where nuclear fission occurs
- 17. energy-rich substances
- 19. a layer of material that traps air to block the transfer of heat
Down
- 1. a factory where crude oil is heated and separated
- 2. made from living things
- 4. made from alcohol and gasoline
- 5. the central core of an atom
- 6. energy from the sun
- 7. chemicals that have carbon and hydrogen atoms
- 8. compounds made of oil
- 9. reducing energy use
- 10. the splitting of an atom's nucleus
- 13. made of metal cadmium
- 16. fuel rods generate too much heat that they start to melt
- 17. a substance that provides energy
- 18. rods made of U-235