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Rock salt may be formed by ____________

(a) Erosion

(b) Winds

(c) Continued evaporation

(d) Continued precipitation

This question was addressed to me in semester exam.

This is a very interesting question from Sedimentary Rocks and Their Mode of Formation topic in portion The Study of Rocks of Engineering Geology

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The correct answer is (c) Continued evaporation

The best I can explain: Limestone may be formed by precipitation from carbonated water due to loss of carbon dioxide. Rock salt may be formed from sodium-chloride rich seawater merely by the process of continued evaporation.

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