Question

Soils high in 2:1 type expanding clay minerals such as montmorillonite develop deep cracks during the dry season and become sticky and swollen during the wet season. Which mechanism best explains this behaviour, characteristic of black cotton (Vertisol) soils?

A High sand content causing poor drainage
B High organic matter content
C Shrink-swell behaviour due to interlayer water movement in the expanding clay lattice
D Presence of calcium carbonate nodules only
E Very low cation exchange capacity
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