During the wet season, mineral salts in the to layer of the soil dissolve in rain water.
The dissolved minerals percolate i.e. seep downwards from the top soil to the sub soil.
The dissolved minerals are deposited further downwards to the lower layer.
Insoluble minerals such as iron and aluminium accumulate at the to layers to form a crust of laterite.
During the dry season, some of the soluble minerals are moved from the bottom layers to the top layer of the soil by capillary action.
steve williams answered the question on December 30, 2017 at 18:54
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