A cobble is a clast of rock defined on the Udden–Wentworth scale as having a particle size of 64–256 millimeters, larger than a pebble and smaller than a boulder.
Concrete Cobbles
A cobble is a clast of rock defined on the Udden–Wentworth scale as having a particle size of 64–256 millimeters, larger than a pebble and smaller than a boulder.
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