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#earth core heat #internal earth heat #geothermal gradient #planet core energy #deep earth temperature #heat source

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#earth heat #geothermal gradient #underground temperature #heat flow #earth's core heat

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#deep earth heat #geothermal gradient #planet center #earth depth #core temperature

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#geothermal gradient #heat flow #solid earth physics #earth's interior #rock physics #mantle properties

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#mantle convection #heat flow #viscous flow #plasticity #geothermal gradient #earth's engine