Shearing, tension, and compression work over millions of years to change the shape and volume of rock. Those are types of stress.
The earth's crust is not stress
Plate motions produce stress in Earths crust that leads to faults, mountain building, and earthquakes.
Compression Stress Tension Stress Shearing Stress
The movement in earths plates create powerful forces that pull or squeeze the rock in the crust.
it means earthquakes will happen more often
Tension
it gets soggy
It causes it to deform - this deformation is called "strain".
I found that folding happens
Plate tectonics, the movement of the large pieces of the earth's crust, give rise to great stress along the boundaries of the plates. Wikipedia has a post on plate tectonics, and a link is provided.
Compression and tension can indeed affect the thickness of the Earth's crust. Compression can thicken the crust by folding and faulting, while tension can cause stretching and thinning of the crust through processes like rifting and faulting. These tectonic forces play a significant role in shaping the Earth's crust over geological time scales.
The Earths crust is approximately 650 km deep.