Across
- 2. replacing incandescent light bulbs with flourescent light bulbs does this
- 5. the original source of wind and water energy
- 6. percentage of coal used for heating
- 7. 13 percent of coal in the United States is used for this
- 9. keeps the heating in your house from escaping
- 13. the nucleus splits in to smaller nuclei
- 15. wood, plant parts, manure, and food wastes
- 16. transportation, electricity, heating & cooling
- 17. what most of the oil in the United States is used for
- 20. electricity made by flowing water
- 23. compounds made from oil
- 26. heat form the Earth's interior
- 28. pushed by wind or water to generate electricity
Down
- 1. how fossil fuels form
- 3. a factory that makes coal in to chemicals
- 4. when fuel rods make so much heat that the begin to melt
- 8. alcohol and gas combined
- 10. two atomic nuclei combine to one nucleus
- 11. a limitation of solar energy
- 12. least amount of coal is used for this
- 14. what percentage of oil in the United States is exported
- 18. 3 major types of fossil fuels
- 19. chemicals with carbon and hydrogen
- 21. petroleum, natural gas, coal, oil
- 22. hydroelectric, solar, nuclear, and hydrogen power
- 24. light and heat given off by the sun
- 25. least amount of oil in the United States is used for this
- 27. something that creates energy
- 29. hydrogen does not do this