energy crossword

1. a nuclear reaction in which the nucleus separates
3. oil is mainly used for
4. a chemical compound that contain hydro and carbon atoms
6. electricity created by the power of moving water
7. compounds that are made from crude oil
8. A layer of material that traps the air to help block the transfer of heat between the air inside the building
9. fossil fuels made in a long amount of time
11. what source is hydrogen fuel cells
12. fuels are burned, the chemical energy that is released can be used to generate another form of energy
13. percent of energy used to do work
16. another name for oil
18. an original source for wind and flowing energy
20. energy created by the movement of the air
21. save energy
22. when uranium rods melt and explode
25. light and heat given off by the sun
26. heat from the earth's interior
27. house that uses passive and active heating systems to get electricity and heat

1. energy-rich substances formed from the remains of organisms
2. 3 types of fossil fuels
5. a nuclear reaction in which the nucleus forms up into a heavy nucleus
10. a factory in which crude oil is heated and separated into fuels and other products
14. coal is most used for
15. wood, plants parts, manure, and food wastes that can be used as fuels
17. 3 types of fossil fuels
19. a substance that provides energy
23. alchohol mixed with gasoline
24. used to start a reaction