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