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The ground is a good insulator though it takes time to warm the soil closest to the heat source. A lot of heat will be lost from the top, but I assume there's a ground-level floor at the top of thi...
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The ground is a good insulator though it takes time to warm the soil closest to the heat source. A lot of heat will be lost from the top, but I assume there's a ground-level floor at the top of thi...