Discussion
The conventional boundary between silt and clay is taken at a diameter of
Answer: D
Correct answer: 0.002 mm
Two micrometres separates silt from clay. The distinction matters far beyond grain size, because particles below it are generally clay minerals, plate-like and electrically active, and it is those properties - plasticity, cohesion, swelling, low permeability - that give clay its engineering behaviour. Silt of the same size range but different mineralogy behaves quite unlike it.
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