Across
- 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
Down
- 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