Answer: Broad-leaved forests.
The following conditions are necessary for the formation of this type of soil: the climate should be moderately continental, precipitation should be present in small quantities, and there should be a lot of sunny days, and, of course, the presence of forests. Trees growing in deciduous forests are an ideal environment for the formation of such soils. The process of decay of leaves and grass, combined with silica and magnesium, is an ideal base.
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