Question

How does ground temperature vary with depth?

Answer 1

At soil depths greater than 30 feet below the surface, the soil temperature is relatively constant, and corresponds roughly to the water temperature measured in groundwater wells 30 to 50 feet deep.

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Answer 2

the ground temperature first decreases because of the presence of ground water but after a few distance it starts increasing because of the molten lava present under the earths crust.