A Leptosol in the FAO World Reference Base for Soil Resources is a very shallow soil over hard rock or highly calcareous material or a deeper soil that is extremely gravelly and/or stony. Leptosols cover approximately 1.7 billion hectares of the Earth`s surface. They are found from the tropics to the cold polar regions and from sea level to the h....
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http://en.wikipedia.org/wiki/Leptosol
one of the 30 soil groups in the classification system of the Food and Agriculture Organization (FAO). Leptosols are soils with a very shallow ...
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http://www.britannica.com/eb/a-z/l/37
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