Concept:Black soil, also called Regur soil, is formed from the cooling and weathering of lava after volcanic eruptions.Explanation:Lava from volcanoes hardens into basalt, an igneous rock. Over time, this rock breaks down into black soil. This soil is rich in iron, lime, and magnesia. It holds moisture well and is ideal for cotton cultivation. It is mainly found in the Deccan Plateau. Other soil types: Alluvial soil is deposited by rivers. Laterite soil forms in alternating wet and dry conditions from rock breakage. Red soil develops from the weathering of old crystalline rocks and is porous. None of these are directly derived from lava.Answer:B. Black soil