What are the mountains? How do old and young mountains differ?

Ans. A mountain is a conical mass of land rising to a much greater height than the surrounding areas. Its uppermost projected plain is called peak. Some of the mountains have rounded features and are low in height. It is because they are very old and have been lower by the forces of nature like wind, water, etc. over a long period. Such as Aravallis. The beat example of young folded mountains is Himalayan.