The weathering and different agents of erosion – rivers, winds, glaciers, etc. are constantly acting on the earth’s crust.
As soon as an elevated mountain range appears on the earth’s surface, the agents of gradation begin their work of leveling it down.
To a large extent, the process of wearing down depends on the shape and structure of the rocks.
After thousands of years, soft rocks are worn down into the sand and the hard rocks are left standing up in the area that has been reduced in height.
These are called residual mountains.
Examples of Residual Mountains in India are:
The Nilgiris, The Parasnath, The Rajmahal, The Aravalis
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