Energy Sources

2. a natural fuel formed in the geological past from the remains of living organisms.(2 words)
4. _______ energy is produced by the internal heat of the earth.
5. process of converting water's energy into electricity.
6. introduction of harmful contaminants into the environment.
8. energy from a source that is not depleted when used (2 words)
13. Type of fuel that requires splitting uranium atoms.
14. liquid fossil fuel that is extracted from the ground. Roughly 1/3 of the world's primary energy comes from this primary fuel.
15. process by which coal is extracted.
19. meeting our own needs without compromising the ability of future generations to meet their own needs.

1. ________ Energy comes from sources that will run out or will not be replenished for thousands or even millions of years.
3. absorb the sun's rays in order to generate electricity or heating. (2 words)
7. Rotates using energy from water or wind to produce an electrical charge.
9. flammable gas, consisting largely of methane and other hydrocarbons. Cleanest of the main fossil fuels. (2 words)
10. informal term used to describe the process used to extract natural gas.
11. ______ energy is produced by the movement of the air.
12. is plant or animal material used as fuel to produce electricity or heat
16. combustible black or dark brown rock consisting mainly of carbonized plant matter, found mainly in underground deposits and widely used as fuel.
17. converts the light/heat of the sun into electricity.
18. barrier constructed to hold back water and raise its level, forming a reservoir used to generate electricity