Across
- 3. A layer of material that traps the air to help block the transfer of heat between the air inside the building
- 5. a substance that provides energy
- 10. energy-rich substances formed from the remains of organisms
- 11. when uranium rods melt and explode
- 13. percent of energy used to do work
- 17. save energy
- 20. 3 types of fossil fuels
- 22. another name for oil
- 23. a chemical compound that contain hydro and carbon atoms
- 24. a factory in which crude oil is heated and separated into fuels and other products
- 25. an original source for wind and flowing energy
- 26. energy created by the movement of the air
- 27. light and heat given off by the sun
- 28. fossil fuels made in a long amount of time
Down
- 1. house that uses passive and active heating systems to get electricity and heat
- 2. fuels are burned, the chemical energy that is released can be used to generate another form of energy
- 4. wood, plants parts, manure, and food wastes that can be used as fuels
- 6. a nuclear reaction in which the nucleus forms up into a heavy nucleus
- 7. alchohol mixed with gasoline
- 8. coal is most used for
- 9. compounds that are made from crude oil
- 12. 3 types of fossil fuels
- 14. oil is mainly used for
- 15. a nuclear reaction in which the nucleus separates
- 16. used to start a reaction
- 18. heat from the earth's interior
- 19. electricity created by the power of moving water
- 21. what source is hydrogen fuel cells