| A | B |
|---|
| Coal | a solid mineral substance found underground (Coal burns very hot.) |
| fossil fuel | fuel formed from the decayed remains of ancient plants and animals (coal |
| natural gas | a fuel used to heat homes; can be used in combination with oil |
| nonrenewable energy | a type of energy which cannot be replaced (fossil fuels) |
| oil | a liquid fuel that is used to heat homes and make gasoline |
| renewable energy | a type of energy that can be replaced |
| sunlight | a source of energy which produces solar energy |
| solar energy | the direct use of sunlight to produce heat or electric power (solar = sun) |
| water power | a constant flow of water that can be used to produce useful electric power |
| wind power | the use of moving air over the Earth's surface (Windmills generate electricity.) |
| wood energy | energy that comes from trees and can be used as a fuel (Wood is burned to produce heat.) |
