Renewable energy

2. harvested from trees and burned for heat or for cooking
3. the sun's rays as a source of energy from which power for domestic or industrial use may be generated
5. this country uses 100% renewable energy
7. a colorless, odorless flammable gas which is the main constituent of natural gas
9. water heated and pumped to an exchanger that heats water for the building
10. the use of the sun's energy directly for either heating or cooling purposes
14. an energy harvesting technology, that converts solar energy into useful electricity through a process
17. power obtained by harnessing the energy of the wind
18. include coal, oil, and natural gas
19. energy from a source that is not depleted when used, such as wind or solar power

1. in passive solar heating, the ________ of the home is the most important
4. relating to or produced by the internal heat of the earth
6. a biomass fuel made from corn and used in gasoline
8. collection of solar energy for use or to a storage system for later use
11. a panel designed to absorb the sun's rays as a source of energy for generating electricity or heating
12. a building with sails or vanes that turn in the wind and generate power to grind grain into flour(Holland)
13. turbine a turbine having a large vaned wheel rotated by the wind to generate electricity
15. renewable source of energy that generates power by using a dam or diversion structure to alter the natural flow of a river or other body of water
16. an area of land with a group of energy-producing windmills or wind turbines