Explain how soil is formed
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Posted by Aditya Raikwar 8 years ago
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Amar Kumar 8 years ago
There are five key processes by which soil is formed, they are:
Leaching - leaching is the removal of soluable components of the soil column.
Eluviation - here soil particles held in suspension, such as clay, are removed (eg. washed away).
Illuviation - here soil particles held in suspension, such as clay, are accumulated (eg. deposited).
Podsolisation - podsolisation occurs when strongly acid soil solutions cause the breakdown of clay minerals. As a result silica, aluminium and iron form complexes with organic substances in the soil.
Gleying - gleying occurs in waterlogged, anaerobic conditions when iron compounds are reduced and either removed from the soil, or segregated out as mottles or concretions in the soil. Marshy wetlands often contain gleyed soils.
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