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Boulders measure more than 256 millimeters in diameter.
Cobbles measure between 64 and 256 millimeters in diameter.
Pebbles measure between 4 and 64 millimeters in diameter.
Granules measure between 2 and 4 millimeters in diameter.
Sand grains measure between 0.06 and 4 millimeters in diameter.
Mud can be composed of silt and/or clay.