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Unfortunately, you intuition about subterranean ground temperatures is incorrect. Basements and cellars do provide cooler conditions to store perishable items because the near surface rock insulates against surface heat. Go deeper however and temperature increases. Near the Earth's surface, within the crust, and away from tectonic boundaries, the rate of ...


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This all comes down to a single issue. Define plate tectonics. There are several ways it can be defined which is why estimates of when it started vary by more than half the age of the planet. At the broadest definition plate tectonics predates liquid water by a decent margin, by the narrowest it may not even predate multicellular life. Like most process ...


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The currently most popular answer here completely fails to mention that your assumption would be impossible, as it would violate laws of thermodynamics, so I will offer my own answer. To the questioner, your assumption is that there would be a subterranean minimum of temperature, with the surface and the deep Earth being warmer. However, this "heat ...


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