Across
- 3. process of passing electricity through water to produce hydrogen gas
- 5. program that recognizes buildings and appliances that use reduced amounts of energy
- 10. fuel that is 20% recycled vegetable oil
- 13. greenhouse gas that is actually more dangerous than CO2
- 15. term used to refer to any energy that comes from the sun
- 16. type of use where a resource is used for personal use
- 19. device that uses indirect solar energy in the form of air currents
- 20. structure built across the mouth of a bay to generate electicity
- 21. major elemental component of photovoltaic cells
- 22. energy derived from present-day photosynthesis
Down
- 1. the process of changing one form of energy to another form
- 2. process by which starches or sugar are converted to ethanol
- 4. type of energy also known as heat energy that has the largest wavelength
- 6. device that rotates to create electrical energy
- 7. description of the process of moving air or water using natural convection currents
- 8. a fuel that is a combination of gasoline and ethanol
- 9. type of cell that collects radiant energy
- 11. using water to provide energy
- 12. type of energy provided by temperatures in the earth
- 14. chemical reaction on the sun that produces energy
- 17. type of stove that uses scrap wood that would normally be discarded
- 18. general term for a device that absorbs solar energy