<P> Geothermal gradient is the rate of increasing temperature with respect to increasing depth in the Earth 's interior . Away from tectonic plate boundaries , it is about 25 -- 30 ° C / km ( 72 - 87 ° F / mi ) of depth near the surface in most of the world . Strictly speaking , geo - thermal necessarily refers to the Earth but the concept may be applied to other planets . </P>
<P> Geothermal gradient is the rate of increasing temperature with respect to increasing depth in the Earth 's interior . Away from tectonic plate boundaries , it is about 25 -- 30 ° C / km ( 72 - 87 ° F / mi ) of depth near the surface in most of the world . Strictly speaking , geo - thermal necessarily refers to the Earth but the concept may be applied to other planets . </P>
the rate at which temperature changes with depth below earth 's surface is called
the rate at which temperature changes with depth below earth 's surface is called
Geothermal gradient
Geothermal gradient