Across
- 2. two hydrogen nuclei combine to create a helium nucleus
- 4. lightbulbs that use more enegy
- 5. used to slow down the chain reactions
- 6. resources that can be used repeatedly
- 9. form of power produced by flowing water
- 11. a factory in which crude oil is heated and separated into fuels and other products
- 14. the original source of energy in wind and flowing water
- 15. form of a fuel and examples are wood and plant parts
- 17. can only be used when sun is shining
- 19. resources that can run out, but can be formed again after millions of years
- 20. are the chemical compounds which fossil fuels are made of
- 24. lightbulbs that use less energy
- 26. oil is mainly used for
- 28. form of energy and is heat from earth's interior
Down
- 1. where uranium fuel undergoes nuclear fission
- 3. adding the alcohol to gasoline forms a mixture
- 7. the percentage of energy that is actually used to perform work
- 8. the neutron hits the U235 nucleus, and the nucleus splits into two smaller nuclei and two more neutrons
- 10. a substance that provides energy such as heat, light, motion, or electricity
- 12. a layer of material that traps air to help block the transfer of heat
- 13. reducing energy use
- 16. when the fuel rods melt, it is also known as
- 18. the least used of the three fossil fuels for electricity production
- 21. most of coal is used for
- 22. are compounds that are made from oil
- 23. are coal, natural gas, and petroleum
- 25. thermal energy converted to mechanical energy
- 26. percentage of coal mined in the U.S.A exported to other countries
- 27. a fossil fuel used a majority of the time back then