Across
- 2. a factor in which crude oil is heated and separated into fuels and other products
- 3. another name for oil from the Latin word "Petra"
- 6. made of metal cadmium, inserted between the fuel rods
- 9. what percentage of the coal mined in the United States is exported to other countries
- 11. putting together
- 13. the part of the nuclear reactor where nuclear fission occurs
- 16. reducing energy use
- 20. electricity produced by flowing water
- 21. the percentage of energy that is actually used to perform work
- 22. solar energy
- 23. breaking apart
- 24. the reactor vessel contains rods of U-235
- 28. compounds that are made from oil
- 29. energy rich substances formed from the remains of organisms
Down
- 1. a layer of material that traps air to help block the transfer of heat
- 4. adding the alcohol to gasoline
- 5. chemical compounds that contain carbon and hydrogen atoms
- 7. what is oil mainly used for
- 8. heat from Earth's interior
- 10. one form of energy to another
- 12. the heat changes water to steam in where
- 14. energy from the sun
- 15. simplest form of energy
- 17. what is most of the coal used for
- 18. percentage of United States electricity production coal
- 19. comes from the force of moving water
- 23. substance that provides energy
- 25. the center core of an atom that contains protons and neutrons
- 26. group of fuels wood belongs to
- 27. the fuel rods generated so much heat that they started to melt