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without specifying an upper size limit. Gravel is sometimes distinguished from rubble, which is loose rock particles in the same size range but angular in shape. The Udden-Wentworth scale, widely used by geologists in the US, defines granular gravel as particles with a size from 2 to 4 mm and pebble gravel as particles with a size from 4 to 64 mm. This corresponds to all particles with sizes between coarse sand and cobbles.

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