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a)Deep black soil is productive due to high proportion of clay and humus. The organic matter present in the soil is contributed by the death and decay of living organisms. These are the richest in nutrients and therefore these soils are the most fertile.
b)Laterite soils are used as a building material because they become hard like iron when exposed to air.Laterite soils are red in color due to the presence of iron oxide. These soils are generally coarse in texture and friable and porous in nature.
c)Its red colour is mainly due to ferric oxides occurring as thin coatings on the soil particles while the iron oxide occurs as haematite or as hydrous ferric oxide. When it occurs in the hydrate form as limonite the soil gets a yellow colour.
d)The vegetation over there is very less, so there will be no plant or tree roots to hold the soil in place, which will make the soil unstable and loose.Hence, Foothills of Himalayas are easily prone to soil erosion.
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