The geothermal gradient is about 25 C/km near the surface but is higher in areas with recent volcanism.

Name: The geothermal gradient is about 25 C/km near the surface but is higher in areas with recent volcanism.
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The geothermal gradient, which is the rate at which the Earth's temperature increases with depth, averages about 25°C per kilometer near the surface. In areas with recent volcanism, the gradient is higher due to the closer proximity of magma and its associated heat.

The Geothermal Gradient Is About 25 C/km near the Surface