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