Question

Write a detailed account of the different physiographic units that highlights the unique
features of each region.
please tell the answer from the ncert geography book class9

Answer 1

Explanation:

10-50 Km and have an altitude varying

between 900 and 1100 metres. These ranges

are composed of unconsolidated sediments

brought down by rivers from the main

Himalayan ranges located farther north.

These valleys are covered with thick

gravel and alluvium. The longitudinal valley

lying between lesser Himalaya and the

Shiwaliks are known as Duns. Dehra Dun,

Kotli Dun and Patli Dun are some of the

well-known Duns.

Besides the longitudinal divisions, the

Himalayas have been divided on the basis of

regions from west to east. These divisions

have been demarcated by river valleys. For

example, the part of Himalayas lying between

Indus and Satluj has been traditionally

known as Punjab Himalaya but it is also

known regionally as Kashmir and Himachal

Himalaya from west to east respectively. The

part of the Himalayas lying between Satluj

and Kali rivers is known as Kumaon

Himalayas. The Kali and Teesta rivers

demarcate the Nepal Himalayas and the part

lying between Teesta and Dihang rivers is

known as Assam Himalayas. There are

regional names also in these broad

categories. Find out some regional names of

the Himalayas

The Brahmaputra marks the eastern-most

boundary of the Himalayas. Beyond the Dihang

gorge, the Himalayas bend sharply to the south

and spread along the eastern boundary of

India. They are known as the Purvachal or the

Eastern hills and mountains. These hills

running through the north-eastern states are

mostly composed of strong sandstones, which

are sedimentary rocks. Covered with dense

forests, they mostly run as parallel ranges

and valleys. The Purvachal comprises the

Patkai hills, the Naga hills, the Manipur hills

and the Mizo hills.