Explanation:

 The Aravalli Range, an eroded stub of ancient mountains, is the oldest range of fold mountains in India.The natural history of the Aravalli Range dates back to times when the Indian Plate was separated from the Eurasian Plate by an ocean. The Aravalli Range is a northeast-southwest trending orogenic belt that is located in the northwestern part of Indian Peninsula. It is part of the Indian Shield that was formed from a series of cratonic collisions.In ancient times, Aravalli were extremely high but since have worn down almost completely by millions of years of weathering, where as the Himalayas being young fold mountains are still continuously rising. Aravalli, being the old fold mountains, have stopped growing higher due to the cessation of upward thrust caused by the stopping of movement of the tectonic plates in the Earth's crust below them.