Renewable Energy

2. The storage of water in a reservoir behind a dam
4. Biological material that has mass
6. Air pollutants that evaporate at typical atmospheric temperatures
7. A device that can be turned by water, steam, or wind to produce power
9. A use of technology that captures and stores energy from the sun
11. Electricity generated by kinetic energy of moving water
13. A by-product of all combustion
14. Energy gained by the kinetic energy of moving air
16. Sources of energy that are infinite
19. Construction technique to take advantage of solar radiation without active technology
20. A use of energy from the sun without active technology

1. Alcohol made by converting starches and sugar from plant material
3. Converting energy from the sun as light, directly into electricity
5. When water is retained behind
8. Energy that comes from the movement of water controlled by the gravitational pull of the moon
10. A liquid fuel created from processed or refined biomass
12. A diesel substitute
15. Heat energy coming from the radioactive decay of elements deep in the ground
17. Technology that transfers heat from the ground to a building
18. A by-product of combustion of any fuel in the atmosphere