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Mud
Sediment made of particles finer than 1/16 mm. This can be divided into silt (1/256-1/16 mm) and clay (less than 1/256 mm). This can be divided into silt (1/256-1/16 mm) and clay (less than 1/256 mm).

Mud is created chemically and biologically by weathering of rocks in soils, but also mechanically in the basal part of glaciers by crushing and grinding of rock particles.