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The heat is derived from initial impacts during Earth's accretionary past, from pressure of overlying material, and from the decay of radioactive material. Keeping it hot has mainly been a function of the radioactive decay and the insulation created by the size of the planet.

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16y ago

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What layer of earth is made up of hot molten rocks?

The outer core is the only molten layer of the Earth. == ==


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What layer in the earth is composed of hot molten liquid?

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What layer of the earth is hot and semisolid?

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