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The interior of the Earth is at a very high temperature. That heat from the core is the ultimate source of geothermal energy.

When the Earth was formed 4.8 billion years ago, the core was mostly molten iron and nickle. The energy to heat the core came from the gravitational energy present at the time of formation. Since then, additional heat energy has been added through nuclear decay of uranium and other heavy materials which were also included in the original formation process.

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12y ago

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