Answer:
India's landmass has great contrasts as the Peninsular plateau in the South is a very old landmass (65 million years), whereas the Himalayas in the north are fairly new (about 25 million years). Tectonically the Himalayas and the Northern plains are unstable zones, whereas the Peninsular plateau is very stable.
Over millions of years, weathering forces have made the contrast sharper. While the Himalayas are composed of sedimentary and metamorphic rocks and the Northern plains are made of deposited alluvium, the Peninsular plateau is made up of igneous and metamorphic rocks. Whereas the Himalayas have lofty peaks and steep sided valleys, the Deccan region has gently rising ranges and wide valleys. Thus the Indian landmass shows a great physical contrast.
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