Across
- 3. a large number of windmills are placed in one area for the purpose of generating electricity
- 4. the amount of a fossil fuel that can be extracted at a profit using current technology
- 6. Energy derived from burning organic material such as wood, alcohol, and garbage.
- 7. conservation method in which old materials are processed to make new ones
- 8. a nonrenewable energy resource formed from the remains of organisms that lived long ago; examples include oil, coal, and natural gas
- 9. Energy from steam or hot water produced from hot or molten underground rocks.
- 13. energy from the sun which is converted into usable energy
Down
- 1. electrical energy produced by falling water
- 2. all discovered and undiscovered deposits of a useful mineral that can be extracted now or at some time in the future
- 5. a solid, hard black substance that burns and gives off heat. Coal is composed mostly of carbon. It is formed from partly decayed vegetable matter under great pressure and heat in the earth.
- 10. a thick, black liquid formed from the buried remains of microscopic marine organisms
- 11. the form of energy associated with changes in the nucleus of an atom; the splitting of a nucleus is fission; the formation of a new nucleus is fusion
- 12. a fossil fuel in the gaseous state; forms under similar conditions as oil
- 14. a mineral or rock that contains a useful substance that can be mined for profit