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Detrital rocks refer to which type of sedimentary rocks?

(a) Mechanically formed

(b) Organically formed

(c) Chemically formed

(d) Residual

This question was posed to me in an online interview.

The above asked question is from Sedimentary Rocks and Their Mode of Formation topic in chapter The Study of Rocks of Engineering Geology

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Right option is (a) Mechanically formed

The best explanation: During the formation of the sedimentary rocks by a mechanical method, original hard and coherent rock bodies are gradually broken down into smaller fragments. This disintegrated, loosened material is called detritus. Hence, clastic rocks are often also called as detrital rocks.

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