There are many landforms on this earth. Any natural elevation of the earth surface is called a Mountain.
Mountains that have been eroded by the agents of degradation such as winds, rain, frost and running water leaving behind only the hard rocks are known as residual mountains. These hard rocks that are left behind are known as the residual mountains.
The Sierras of central Spain and Mesas of USA are some examples of residual mountains. In India, the Aravalli Mountain and the Parasnath mountain of Bihar belong to this type.