When pressure is removed from overlying rock,the pressure of deep burial is relieved,initiating pressure-release jointing.The joints then separate into curved slabs.This is known as

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The process described in the question, where pressure-release jointing causes curved slabs to separate from overlying rock, is specifically known as exfoliation. Salt crystal growth, spheroidal weathering, and frost wedging are all different processes that can lead to the breakage and weathering of rock, but none of them involve the unique curved slabs that characterize exfoliation.

When Pressure Is Removed from Overlying Rock,the Pressure of Deep