Discussion
The colour of Red soil is due to presence of :
Answer: B
Red soil gets its colour from Iron.
Red soils develop on old crystalline and metamorphic rocks such as granite and gneiss in areas of low to moderate rainfall, across Tamil Nadu, Karnataka, Andhra Pradesh, Odisha and Jharkhand. Iron released by weathering is oxidised and spread through the soil as ferric oxide, which gives the red colour; where the iron is hydrated the soil looks yellow.
Magnesium and aluminium compounds are pale, and copper is not present in amounts that could colour a whole soil type.
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