Question

Peninsular Plateau is an old landmass of rocks whereas Himalayas is a young mountain of rocks.

Comment on the rock type in these two areas. Discuss how it has influenced the evolution of the river valleys in these areas.

Answer 1

1. Peninsular Plateau: The Peninsular Plateau is made up mostly of igneous and metamorphic rocks, which are very old, hard, and resistant to erosion. Due to this, rivers in this region flow over a gentle slope, forming shallow and broad valleys with a low gradient and less erosion.
2. Himalayas: In contrast, the Himalayas consist mainly of young sedimentary rocks, which are softer and more easily eroded. As a result, rivers here have a steep gradient and flow swiftly, cutting through the rocks to form deep gorges and V-shaped valleys.