Discussion
Exfoliation or sheeting of a granite dome is caused chiefly by
Answer: A
Correct answer: release of confining pressure as overburden is removed
Granite crystallised at depth is under great confining pressure, and as erosion strips the rock above it the mass expands upward. The tension that results opens fractures parallel to the ground surface, closely spaced near the top and further apart with depth, and the resulting sheets spall away to leave the rounded dome. It is a mechanical process driven by unloading, not by frost, salt or chemistry.
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