Geography Online Class PPT - nationaldefenceinstitute.in
Transcript of Geography Online Class PPT - nationaldefenceinstitute.in
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8. INDIA – LOCATION RELIEF AND DRAINAGE
GEOGRAPHY
LECTURE-8
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Introduction
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India and the World
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India: A Subcontinent
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Location and Extent
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Major Physiographic Divisions of India• The majestic Himalayan peaks in the north, the beautiful beaches in the south, the great Indian
desert in the west and the breathtaking natural heritage in the east make India a geographically
vibrant, colourful and truly incredible country.
• There is a varied nature of physiographic divisions in India. Though the country has many
landforms based on the major differences, it is divided into the following five physiographic
divisions:1. The Northern Mountains
2. The Northern Plains
3. The Peninsular plateau
4. The Coastal Plains
5. The Islands
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• The Northern Mountains consist of the youngest and
the loftiest mountain chains in the mworld.
• It was formed only few millions years ago and formed
by the folding of the earth crust due to tectonic activity.
• It stretches for a distance of 2,500 km from the Indus
gorge in the west to Brahmaputra gorge in the east.
• The width of the Northern Mountains varies from 500
km in Kashmir to 200 km in Arunachal Pradesh. The
Pamir Knot, popularly known as the “Roof of the
World” is the connecting link between the Himalayas
and the high ranges of Central Asia.
• From the Pamir, Himalayas extend eastward in the form
of an arc shape. The term “Himalaya” is derived from
Sanskrit. It means “The Abode of Snow”.
The Northern Mountains
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1. The Trans-Himalayas
The Northern Mountains that function as a great wall is grouped into three divisions.
• The Trans-Himalayas
• Himalayas
• Eastern Himalayas or Purvanchal or Arunachal hills.
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• It lies to the north of the great Himalayan range. It lies in Jammu and Kashmir and Tibetian plateau. As its areal extent is more in Tibet, it is also known as TibeteanHimalayas.
• The Trans-Himalayas are about 40 km wide in its eastern and western extremities and about 225 km wide in its central part. They contain the Tethys sediments.
• The rocks of this region contain fossils bearing marine sediments which are underlain by ‘Tertiary granite’. It has partly metamorphosed sediments and constitutes the core of the Himalayan axis.
• The prominent ranges of Trans Himalayas are Zaskar, Ladakh, Kailash, and Karakoram.
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2. The Himalayas
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• It constitutes the core part of northern mountains. • It is an young fold mountain. • It was formed by the movement of Eurasia landmass in the north and Gondwana land
mass in the south. • The Tethys sea found between these two land masses was uplifted by the compression
and the resultant landform was the Himalayas.It consists of many ranges.
• (i) The Greater Himalayas/The Himadri• (ii) The Lesser Himalayas /The Himachal• (iii) The Outer Himalayas/The Siwaliks
The main divisions of the Himalayas are the
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Andaman and Nicobar Island
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