Geothermal gradient is the rate of increasing temperature with respect to increasing depth in the Earth's interior.

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Mantle partial melting by increase in geothermal gradient (rising plume, 'hot-spot')

Earthguide: Online Classroom - Geothermal Gradients

Entry SFE06 // Lava . Location // Mystic Hot Springs UT . Field Log // This long trip home has become something of a journey to the center of the Earth. Hot springs emerge from deep underground where a mysterious force known as the geothermal gradient superheats them through contact with rocks and magma. Cradled in the mineral encrusted bathtubs of the Mystic Hot Springs we can feel subterranean lava coursing through our veins. Perhaps this is how Betty feels after refueling. . Capture…

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