laterization

American Heritage
Science Dictionary
laterization   (lāt'ə-rĭ-zā'shən)  Pronunciation Key 
The weathering process by which soils and rocks are depleted of soluble substances, such as silica-rich and alkaline components and enriched with insoluble substances, such as hydrated aluminum and iron oxides. Laterization is especially common in tropical regions that have a pronounced dry season and a water table that is close to the surface.
The American Heritage® Science Dictionary
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