Is sand lighter than clay ? If so , then why does the layer of clay settle above that of sand in the experiment ( adding soil to water etc.)?

The sand comprises of bigger particles of size 0.5 to 2.0 millimeters while the clay particles are very fine and are less than 0.002 millimeters in size.

As sedimentation takes place according to the size and weight. Thus, sand particles settle below the clay particles.

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