What are some differences between faults and folds?
Folding and faulting are both caused by stress in the Earth's crust exceeding the strength of the material. [ However there are differences in the confining stresses and or temperatures at which these two processes occur.
Folding tends to occur at small strain rates (the speed at which the material changes shape or is squashed is very small), at higher confining pressures and with higher
temperatures at greater depths in the Earth, usually within the asthenosphere or mesosphere. All of these factors act to stop the formation of fractures within the material leading to ductile deformation which is why the rocks can fold rather than break.
Faulting occurs where strain rates are large and there are relatively low temperatures and confining pressures at shallower depths within the earth's lithosphere. These conditions allow fractures to propagate through the rock causing faulting. ]
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