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What is the characteristic sloping surface in rotational slides?

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What is the characteristic sloping surface in rotational slides?

(a) Curved

(b) Planar

(c) Circular

(d) Undulated

The question was posed to me in a national level competition.

This intriguing question comes from Types of Mass Movements topic in section Mass Movements of Engineering Geology

1 Answer

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Correct answer is (a) Curved

For explanation: In rotational slides, the failing surface is generally curved in character and the speed of failure is also quite rapid. Because of the nature of the failing surface, the movement of the mass takes the form of a sort of rotation, rather than translation.

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