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The formation of sheets and subsequently joints occurs in which of the following processes?

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The formation of sheets and subsequently joints occurs in which of the following processes?

(a) Frost action

(b) Insolation

(c) Flow of water

(d) Unloading

I had been asked this question in an internship interview.

The origin of the question is Geological Work of Atmosphere in division Geological Work of Natural Resources of Engineering Geology

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Correct answer is (d) Unloading

The explanation: The rock masses under the effect of unloading remain confined from sides but due to relief of pressure from above, they expand upwards; consequently joints develop in them parallel to the uncovered surface dividing them into sheets.

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