Across
- 4. The production of two useful forms of energy from the same fuel source.
- 8. Energy sources that are still in development. For it to be viable it must prove to be cost effective and have acceptable environmental impacts.
- 12. This uses the temperature difference in surface and deep ocean waters in the tropics to generate electricity.
- 13. A long loop of piping that circulates fluid underground to warm and cool homes. In summer it cools a home and in winter it warms a home.
- 14. A mixture of gasoline and ethanol which produces less air pollution than fossil fuels.
- 18. Electricity is produced chemically by combining hydrogen fuel with oxygen from the air.
- 19. A device used to initiate and control a sustained nuclear chain reaction. Surrounded by thick pressure vessel that is filled with a cooling liquid. The pressure vessel contains any products in case of an accident.
- 20. Uses sun's energy to heat something directly.
- 21. Plant material, manure, and any other organic matter that is used as an energy source.
- 22. Oil that is pumped from the ground, or crude oil.
- 23. A wheel that changes the force of a moving gas or liquid into energy that can do work.
Down
- 1. Electricity produced in a small stream without having to build a big dam. This uses instruments such as floating turbines.
- 2. Energy that comes from sources that will eventually run out, or will not be replenished in our lifetimes.
- 3. Energy from sources that are constantly being formed.
- 5. Saving energy by using energy-efficient devices, wasting less energy, etc.
- 6. Tidal movement from oceans are used to generate electricity much like a hydroelectric dam. High tides trap water behind a dam, and when the water is released during low tide it turns a turbine producing electricity.
- 7. The movement of wind is converted into electrical energy, and it the fastest growing source of of energy in the world
- 9. Energy produced from moving water, a renewable energy resource that accounts for 20% of the earth's electricity.
- 10. The percentage of energy put into a system that does useful work.
- 11. Solar cells that convert the sun's energy into electricity.
- 15. Energy from the sun that is gathered by collectors and used to heat water or to heat a building.
- 16. Energy from the heat in the earth's crust is used to generate electricity.
- 17. A machine that converts mechanical energy, or motion, into electrical energy.
- 18. A natural resource that comes from the remains of ancient organisms that changed into coal, oil, or natural gas.
- 19. The energy within the nucleus of an atom, which fuels nuclear power plants.