Across
- 3. Only used as 2.2% of energy in America.
- 7. Energy conversion that occurs when a car engine burns gasoline.
- 9. Light and heat given off by the sun.
- 10. The combining of an atom's nucleus into two nuclei
- 12. Mostly used source of electricity in America.
- 13. Layer that traps heat and decreases the amount of heating energy a house needs
- 14. What solar, wind, and geothermal energy is.
- 17. The combining of two atomic nuclei.
- 19. What solar space heating resembles.
- 24. Heat from sun heat being trapped by windows.
- 26. Chemical compounds that contain carbon and hydrogen atoms.
- 28. Compounds made from oil.
Down
- 1. The largest collective renewable energy source in America.
- 2. What oil is mainly used for.
- 4. What oil only supports 5% of.
- 5. Wood, plant parts, manure, and food wastes can be used as this.
- 6. What solar panels are made up of.
- 8. Heat from Earth's interior.
- 10. What coal, natural gas energy is.
- 11. Energy that comes from movement of a turbine.
- 15. Adding alcohol to gasoline forms this.
- 16. What happens when fuel rods produce too much heat
- 18. A substance that provides enough energy such as light, motion, or electricity.
- 20. Made from water, biomass, and natural gas.
- 21. Besides solar energy this energy comes from the sun.
- 22. A factory which crude oil is heated and separating fuel and other products.
- 23. What coal supports only 1% of.
- 25. Electricity produced by flowing water.
- 27. What wind energy blows on to start an electric current.