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