Alternative Energy

2. A dye used as an acid-base indicator.
3. A gas released from the decomposition of wastes.
7. Energy that has the ability to perform work, but is not being used.
8. An Energy, as solar, wind, or nuclear energy, that can replace or supplement traditional fossil-fuel sources, as coal, oil, and natural gas.
11. Using energy from a fission process for an energy source.
14. A deposit of organic material containing stored solar energy that can be used as fuel. The most important are coal, natural gas, and oil.
15. An oily, thick, flammable, usually dark-colored liquid
17. Ethyl alcohol; most commonly derived by fermentation of plant materials; used as a fuel substitute/replacement for petroleum based fuels.
20. The act or process of burning.
21. A volatile, flammable liquid mixture of hydrocarbons, obtained from petroleum, and used as fuel for internal-combustion engines, as a solvent, et cetera.
22. A combustible mixture of gaseous hydrocarbons that accumulates in porous sedimentary rocks, esp. those yielding petroleum

1. Energy taken from heat sources underground, often in volcanically active areas.
4. Energy used to perform work.
5. A combustible petroleum distillate used as fuel for diesel engines.
6. Renewable resources; resources that can be replaced after use through natural means.
9. The ability to do work or cause change.
10. using the sun as a heat energy source.
12. A readily combustible mineral containing more than 50 percent by weight and more than 70 percent by volume of carbonaceous material.
13. The use of a natural resource in such a way as to minimize waste and maintain the resource in as good a condition as is practical.
16. Producing electricity from water-driven turbine generators.
18. A high-speed rotary engine driven by water, wind, steam, or other gases.
19. A fuel made primarily from oily plants (such as the soybean or oil palm)