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fossil fuel |
any carbon-containing fuel formed from the remains of prehistoric plants and animals. Coal, petroleum, and natural gas are examples of fossil fuel. |
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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