Clay, Definition, Formation, Properties, Uses, & Facts

Clay, soil particles the diameters of which are less than 0.005 millimeter; also a rock that is composed essentially of clay particles. Rock in this sense includes soils, ceramic clays, clay shales, mudstones, glacial clays, and deep-sea clays. Clay materials are plastic when wet and coherent when dry.

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Clay, Definition, Formation, Properties, Uses, & Facts