A. Stress in the crust
Earthquakes are the shaking and trembling that results from the movements of rock beneath the earth's surface. The movement of plates create powerful forces that sqeeze or pull the rock in it's crust.
Three different types of stress occure in the crust - shering, tention, and compresion. The shearing changes the shape of the rock. Which means it has to break slip it appart to do that. Tension is the stress force that pulls on the crust, streching rock so that it becomes thinner in the middle. Compresion is what squeeses rock until it folds or breakes. One plate pushing against another compresses rock like a giant trash compactor. Deformation is when any changes in the volume or shape of earth's crust.
Shearing creates strikes - slip faults. In the strike - slip faults the rocks on either side of the faults slips past each other sideways with little up - or - down motion. Normal Faults are caused in the tension forces in earth's crust. Normal Faults is when the fault is at an angle, so one block of rock lies above the faults while the other rock lies below the fault. Hanging wall is the wall that is hanging over. Reverse faults are caused by compression forces. Reverse faults and normal faults are the same but slide in differen directions. The magestic in Glacier National Park were formed by some kind of reverse faults.
The fault-blocked mountain forms when normal faults uplifts a block of rock. Tension forces create new normal faults where two plates move away from eachother.