Mountain, plateau and plain are land features of the earth’s surface produced by the deformation of its crust.
About 27% of the earth’s surface is covered by the mountains.
Generally, they are uplifted portions of the earth’s surface which are much higher in contrast to the surrounding areas.
But all uplifted or elevated areas are not mountains.
For example, the elevated portion in Tibet, which is about 4500 metres high above sea level, is called a plateau and not a mountain.
The formation of a mountain range takes millions of years.
Mountains are those uplifted portions of the earth’s surface which have steep slopes and small summit area rising more than thousand metres above the sea level.
Mountains have the maximum difference of height between their high and low portions.
The uplifted portions of the earth’s surface with steep slopes and small summit area rising above 1000 metres and formed over a period of millions of years are called mountains.
Classification of Mountains
On the basis of their mode of formation, the mountains have been classified as:
[A] Fold Mountains
[B] Block Mountains