Across
- 3. a substance that provides energy
- 6. another name for oil
- 13. reducing energy use
- 14. rods used to slow down chain reactions when the reactor vessel gets too hot
- 20. a layer of material that traps air
- 21. three needs for fuel are transportation, heating and cooling, and
- 23. can be replenished in a short amount of time
- 24. breaking apart
- 25. electricity produced by flowing water
- 26. compounds that are made from oil
- 28. energy rich substances formed from the remains of organisms
- 29. the percentage of energy that is actually used to perform work
- 30. the part of the nuclear reactor where nuclear fission occurs
Down
- 1. the three major types of fossil fuels are oil, natural gas, and
- 2. what does wind, flowing water, and steam turn
- 4. light and heat given off by the sun
- 5. coming together
- 7. what is oil mainly used for
- 8. a factory in which crude oil is heated and separated into fuels and other products
- 9. adding alcohol to gasoline forms this mixture
- 10. rods in the reactor
- 11. cannot be replenished in a short amount of time
- 12. a change from one form of energy to another
- 15. chemical compounds that contain carbon and hydrogen atoms
- 16. heat from earth's interior
- 17. wood, plant parts, manure, and food wastes that can be used for fuels
- 18. what is coal mostly used for
- 19. the central core of an atom
- 22. through what can stored chemical energy be released
- 27. what is the melting of fuel rods called