Question

what is the relation between temperature and descent into the earth crust

Answer 1

There are a couple if main reasons.

There is a relationship between pressure, volume and temperature. Since the volume of the Earth doesn't change amd the pressure increases with depth, the temperature has to increase to maintain a state of thermodynamic equilibrium.

Decay of radioactive isotopes within the core and mantle.

Answer 2

The amount of processes happening in the earth's core releases a lot of energy.The energy turns into heat as it tries to come out of the earth's crust which warms up the earth near the core and has very less effect on the surface.So as we go deeper into earth, we start to deal the energy in the form of heat so our body temperature rises.

Bonus:The energy in the form of heat is makes the rocks melt under the surface and it comes out in the form of lava firm volcanoes.


hope it helps.