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What is the average grain size of rudaceous rocks?

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What is the average grain size of rudaceous rocks?

(a) Greater than 1 mm

(b) Lesser 1 mm

(c) Greater than 2 mm

(d) Lesser than 1 mm

I have been asked this question by my college director while I was bunking the class.

My question comes from Classification of Sedimentary Rocks topic in portion The Study of Rocks of Engineering Geology

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The correct answer is (c) Greater than 2 mm

To explain: Rudites or rudaceous rocks include all coarse-grained rocks of heterogeneous composition. The average grain size of the constituents in rudites is greater than 2 mm.

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