Concept:Black soil, also called Regur soil, is formed by the weathering and cooling of volcanic lava from igneous rocks.
Explanation:Volcanic eruptions release hot lava. When this lava cools and hardens, it forms basalt, an igneous rock. Over time, this rock weathers to create black soil.
Black soil is rich in iron, lime, magnesia, and alumina. It is found mainly in the Deccan Plateau. This soil is ideal for cotton cultivation.
Other soils form differently: Alluvial soil is deposited by rivers and is best for general agriculture. Laterite soil develops in alternating wet and dry climates and is acidic, good for tea and coffee. Red soil is porous and suited for millet, wheat, and pulses.
Only black soil has a direct origin from volcanic lava.
Answer:B. Black soil