📑 Contents

Question 64

The black cotton soil of India has been formed due to the weathering of

AOptions

A) brown forest soil

B) fissure volcanic rock

C) granite and schist

D) shale and limestone

BSolution

The black cotton soils, also known as Regur soils, are characteristic of the Deccan Trap region of India. These soils are formed from the in-situ weathering of basaltic lava rocks. Basaltic rocks are a type of extrusive igneous rock that originated from fissure volcanic eruptions, where lava flowed out from long fissures or cracks in the Earth's crust. The rich clay content, particularly montmorillonite, gives them their characteristic black color and high water-retention capacity.

CStrategy

For questions on soil types, understand their formation processes and parent rock materials. Associate specific soil types with particular geological regions or rock formations in India. Knowledge of basic geology (igneous, metamorphic, sedimentary rocks) is helpful.

DSyllabus Analysis

This question falls under Indian Geography, specifically Soil Types and their Formation.

EQuestion Analysis

Easy. This is a fundamental fact about Indian soils, particularly the black cotton soils.