Discussion
The mineral responsible for the heaving of black cotton soil is chiefly
Answer: C
Correct answer: montmorillonite
Black cotton soil is a montmorillonite clay derived from the weathering of basalt, and its heave in the wet season and shrinkage in the dry are the direct consequence of water entering and leaving the interlayer spaces. Foundations on it must either reach below the zone of seasonal moisture change or be designed to tolerate the movement.
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