Answer:
The three parallel ranges of the Himalayas
are:
(a) Himadri (Great or Inner
Himalayas)
It is the most continuous range. The
northernmost range is called the Himadri. It consists of loftiest peaks with an
average height of 6,000 metres. It contains all the prominent peaks It remains
snow covered throughout the year, resulting into the formation of glaciers and
some perennial rivers.
(b) Himachal (Lesser Himalayas)
It
lies to the south of Himadri and forms the most rugged mountain system. The
ranges are mainly composed of highly compressed and altered rocks. Average
height is betwee3,700 to 4,500 metres. Some famous ranges are the Pir Panjal
range, Dhaula Dhar and Mahabharat ranges. It has some famous valleys like
Kullu, Kangra and Kashmir. They are known for their hill stations. The average
width is 50 Km.
(c)
Shiwaliks (Outer Himalayas)
This
is the outermost range of the Himalayas. Its height varies between 900 and
1,100 metres. These ranges are composed of unconsolidated rock material, so
these ranges are prone to earthquakes and landslides. These longitudinal
valleys lying between lesser Himalayas and Shiwaliks are called 'Duns' like
Dehra Dun, Kotii Dun and Patlin Dun, etc.
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