A) Deposits by rivers
B) Volcanic activity
C) Decay and decomposition of vegetation,
D) Chemical activity
Correct Answer: B
Solution :
Most of the tropical black soils have been formed as a result of volcanic eruptions in the geological history of the earth. The black cotton soil of India is a very good example of such soils. These soils have been formed due to solidification of lava spread over an area of more than five lakh sq km during the volcanic activity in the Deccan Plateau, thousands of years ago.
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