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| The solid part of the earth consisting of the crust and outer mantle. |
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| From the radioactive decay process within Earth's core. |
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| From Earth itself, as well as the Moon and Sun. |
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| A black or dark-brown combustible mineral substance consisting of carbonized vegetable matter, used as a fuel. |
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| Refined or crude petroleum. |
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| A gaseous mixture consisting mainly of methane trapped below ground; used extensively as a fuel |
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| Energy derived from the sun in the form of solar radiation. |
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| Energy released by reactions within atomic nuclei, as in nuclear fission or fusion. |
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