In both the FAO and USDA soil taxonomy, a vertisol (in Australia, sometimes `vertosol`) is a soil in which there is a high content of expansive clay known as montmorillonite that forms deep cracks in drier seasons or years. Alternate shrinking and swelling causes self-mulching, where the soil material consistently mixes itself, causing vertisols.....
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http://en.wikipedia.org/wiki/Vertisol
one of the 12 soil orders in the U.S. Soil Taxonomy. Vertisols are clay-rich soils that undergo significant vertical cracking during the dry seasons. ... [2 related articles]
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http://www.britannica.com/eb/a-z/v/17
one of the 30 soil groups in the classification system of the Food and Agriculture Organization (FAO). Vertisols are characterized by a ...
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http://www.britannica.com/eb/a-z/v/17
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