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Compressional stress.
Differential stress that squeezes a rock mass as if placed in a vise is known as compressional stress (com = together, premere
Compressional stresses are most often associated with convergent plate bound- aries.
Compressional stresses associ- ated with convergent plate boundaries tend to shorten and thicken Earth's crust by folding, flowing, and fault- ing, whereas tensional stresses along divergent plate boundaries tend to lengthen rock bodies by displacement along faults in the upper crust and by ductile flow at depth.
Size differences notwithstanding, most folds result from compressional stresses that result in a shortening and thick- ening of the crust.
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