Energy Sources

1. Wastes that are poisonous, cause cancer, or can catch fire.
2. Also called solar cells; converts radiant energy directly into electrical energy.
3. A fossil fuel composed of mostly methane, but it also contains other gaseous hydro-carbon compounds, such as propane and butane.
8. The clearing of forest land for agriculture, grazing, urban development, or logging.
12. Energy sources formed from the remains of ancient plants and animals that were buried and altered over millions of years.
13. Any substance that contaminates the environment.
14. Uses energy from controlled nuclear reactions to generate electricity.
15. A solid fossil fuel that can be sound in mines.
16. A flammable liquid formed form the decay of ancient organisms.
17. Smog that results from the reaction between sunlight and a vehicle or factory exhaust.
18. Occurs when a atomic nuclei combine at very high temperatures.
19. The thermal energy contained in and around magma.

1. Electric current produced from the energy of moving water.
4. Acidic moisture that falls from the sky that can corrode metals and cause harm to plants and animals.
5. Renewable organic matter, such as wood, soy, corn, sugarcane fibers, rice hulls, and animal manure.
6. The largest number of individuals in a particular species that the environment can support, given the natural resources available.
7. Includes all the individuals of one species living in a particular area.
9. Occurs when the nucleus of an atom splits apart.
10. Resources that cannot be replaced by natural processes as quickly as they are used.
11. Any radioactive material that results when radioactive materials are used.
20. An energy resource that is replaced by natural processes faster than humans can consume the resource.