piottir pd.7 science

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