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The process of folding which causes fracture in rocks initially is ___________

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The process of folding which causes fracture in rocks initially is ___________

(a) Flexural folding

(b) Flowage folding

(c) Shear folding

(d) Intrusion folding

This question was addressed to me in an internship interview.

I'd like to ask this question from Causes of Folding topic in section Folds and Folding of Engineering Geology

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Correct answer is (c) Shear folding

Easiest explanation: In many cases, folding is attributed to shearing stresses rather than simple compression. It is assumed that in such a process, numerous closely spaced fractures develop in the rock at the first stage of the process.

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