why do objects heat up when you put pressure on them?

Question

for example rocks under the earth have tons of pressure on them from the weight above.
WHAT creates the heat from the pressure?

Answer 1

Because it forces the particles together and they collide with each other more, increasing their overall kinetic energy. After all, temperature is the measure of the overall kinetic energy of the particles in an object.

Answer 2

Gases heat up with the contraction in volume when pressure is applied. (They do not continue to heat up though once a steady pressure is reached). Incompressible matter does not heat up though. I would suggest that the heat in rocks underground is due to dissipation of heat from the earth's hot core and in part radioactive decay.

Answer 3

when you pressure a object its atoms comes more closure to each other.atomic bonds become compressed.when they compress it generate heat.