Which factor has the least effect on the shape of the overall geothermal gradient?

Question

Quizplus · Accepted Answer

The type and composition of rock in the mantle can affect the geothermal gradient, but it has the least effect among the given options. Other factors such as loss of heat at the surface, increasing temperature with compression of rock at high pressure, and heating of the lower mantle by the hotter core have greater contributions to the overall shape of the geothermal gradient.

Which Factor Has the Least Effect on the Shape of the Overall