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What is the size required for a particle to be called gravel?

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What is the size required for a particle to be called gravel?

(a) Greater than 1 mm

(b) Lesser 1 mm

(c) Greater than 2 mm

(d) Lesser than 1 mm

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

I want to ask this question from Classification of Sedimentary Rocks topic in section The Study of Rocks of Engineering Geology

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The correct answer is (c) Greater than 2 mm

The best explanation: All sediments and clastic fragments of rocks above the size of 2 mm irrespective of their composition and shape are broadly termed as gravels.

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