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Reverse Search
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| energy |
Energy is power or heat that comes from sources such as the sun, wind, moving water, natural gas, or oil. Energy from these and other sources can be used to generate electricity or give power to cars. Humans use energy to stay warm, cook, produce light, and make things move or operate. [1/3 definitions] |
| fossil fuel |
any carbon-containing fuel formed from the remains of prehistoric plants and animals. Coal, petroleum, and natural gas are examples of fossil fuels. |
| methane |
a gas made of carbon and hydrogen atoms that is stored in and collected from the earth. Methane is used for heating and cooking in the form of natural gas. |
| natural gas |
a mixture of gases found in the earth's crust. Natural gas is burned as cooking and heating fuel. |
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