Vertisols

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Vertisols An order of mineral soils which contain more than 30 per cent by weight of swelling clay (e.g. montmorillonite), and expand when wet and contract when dry to produce a self-inverting soil and an undulating (gilgai) microrelief. Vertisols are associated with seasonally wet and dry environments, and are extensive in the tropics, forming beneath grassland.

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