| Heat In Earth’s Interior |
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| q | There are two major sources
of the heat in Earth’s |
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| interior: |
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| (1) Radioactive decay: of
potassium, uranium, and |
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| thorium. |
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| (2) Residual heat from
Earth’s formation: A |
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| tremendous amount of energy was transferred to Earth |
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| during the accretion of the planet by collisions with |
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| planetesimals. |
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