The Peninsular Plateau of India is mainly made of which rocks?

Correct answer: Ancient hard igneous and metamorphic rocks

Direct answer: Option A is correct. The Peninsular Plateau is an ancient, stable part of India’s crust and is mainly made of very old hard igneous and metamorphic rocks. Step by step: magma cooled and formed igneous rocks; older rocks were changed by heat and pressure into metamorphic rocks; long erosion exposed and shaped this ancient block; it did not form mainly from recent river deposits. Option A therefore matches the geological structure. B is wrong because new alluvial soil is deposited by rivers, especially in plains such as the Northern Plains; it is not the main bedrock of the Peninsular Plateau. C is wrong because marine coral forms particular reefs and coastal deposits, not this broad ancient plateau. D is wrong because glacial ice is not a rock foundation and does not describe the plateau. The plateau may have layers of soil and local sediment, but the question asks what it is mainly made of. Exam cue: “Peninsular Plateau = old crystalline igneous and metamorphic rocks.”