When lava flows, hot springs, geysers, etc., are naturally cooled by the climate they interact with when they reach the surface, how is core temperature sustainable?
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The core and mantle has radioactive elements which decay, producing heat. Also there is a massive amount of heat there, and it’s taking almost forever to cool off. The Sun will destroy Earth much earlier than it can possibly cool down. Even the Moon, which is much smaller than Earth, hasn’t cooled down completely yet, and it even had active volcanoes relatively recently.
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