Discussion
Sheet jointing parallel to a rock surface is caused by
Answer: C
Correct answer: release of confining pressure as overburden is removed
Rock formed at depth is under great confining pressure, and as erosion removes the overburden it expands upward. The tension that results opens fractures parallel to the ground surface, closely spaced near the top and further apart with depth. The effect is most obvious in granite, where it produces the onion-like sheets of exfoliation domes, and it is why a quarry floor may heave after excavation.
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