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Which among the following has S-shaped outline?

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Which among the following has S-shaped outline?

(a) Crescentic dune

(b) Barchans

(c) Transverse dunes

(d) Sigmoidal dunes

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This intriguing question comes from Geological Work of Wind topic in section Geological Work of Natural Resources of Engineering Geology

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The correct answer is (d) Sigmoidal dunes

The best explanation: A typical sigmoidal dune is characterized with the absence of horns or cusps and a curved outline. In its simplest form, a sigmoidal dune is a steep sided ridge that extends in a sinuous or S-shaped outline.

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