What is the major result of continuous alluvial deposition in the Ganga Plain?

Correct answer: Development of fertile agricultural plains

Correct answer: A. Alluvium is the material—such as silt, sand, and clay—carried and deposited by rivers. The Ganga and its tributaries repeatedly spread this material across the plain during floods and changing river courses. Over time, these deposits build broad, level plains and renew or enrich the soil with mineral particles. This helps agriculture, although flooding can also cause damage. Option B is wrong because coral islands are built mainly by marine organisms in suitable warm, shallow seas, not by river alluvium. Option C is wrong because deposition in a warm river plain does not expand glaciers. Option D is wrong because continuous river deposition generally supports fertile plains rather than producing a complete desert. Memory cue: “river deposition + fine sediments = fertile alluvial plain.”