Physical features of india

CLASS IX - SOCIAL SCIENCE
GEOGRAPHY- LESSON 2
PHYSICAL FEATURES OF INDIA

1. PHYSICAL FEATURES OF INDIA CLASS IX – SOCIAL SCIENCE GEOGRAPHY – CHAPTER 2 (BY: MRS USHA JOY)

2. PHYSICAL FEATURES OF INDIA The land of India displays great physical variation. The Peninsular Plateau constitutes one of the ancient landmasses on the earth’s surface. The Himalayas and the Northern Plains are the most recent landforms.

3. GONDWANA LAND

4. PHYSICAL FEATURES OF INDIA MAJOR PHYSIOGRAPHIC DIVISIONS (1) The Himalayan Mountains (2) The Northern Plains (3) The Peninsular Plateau (4) The Indian Desert (5) The Coastal Plains (6) The Islands

5. Physical Map of India

6. The Himalayan Mountains The Himalayas are young and structurally fold mountains. They run in a west-east direction from the Indus to the Brahmaputra . The loftiest and one of the most rugged mountain barriers of the world. Its length is about 2,400 Km and width varies from 400 Km in Kashmir to 150 Km in Arunachal Pradesh. The Himalayas consist of three parallel ranges in its longitudinal extent.

7. The Himalayas-Longitudinal divisions The Great or Inner Himalayas or the Himadri . Himachal or lesser Himalaya. Outer Himalayas or the Shiwaliks

8. The Himalayas

9. The Himalayas

10. The Great Himalayas The Great or Inner Himalayas or the Himadri . It is the most continuous range consisting of the loftiest peaks with an average height of 6,000 metres . It contains all prominent Himalayan peaks and the folds are asymmetrical in nature. The core is composed of granite, it is perennially snow bound and a number of glaciers descend from this range.

11. Himachal or lesser Himalaya It is the most rugged mountain system The altitude varies between 3,700 and 4,500 metresand the average width is of 50 Km. The Pir Panjal range, the Dhaula Dhar and the Mahabharat ranges are the prominent ranges. The ranges are highly compressed and altered rocks. Famous valleys located here are Kashmir, the Kangra and KulluValley . They are well-known for its hill stations.

12. The Shiwaliks The Shiwaliks extend over a width of 10-50 Km and an altitude varying between 900 and 1100 metres . These are composed of unconsolidated sediments brought down by rivers. They 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.

13. Latitudinal Division of the Himalayas These divisions (west to east) are demarcated by river valleys. The part of Himalayas lying between Indus and Satluj -- Punjab Himalaya Satluj and Kali rivers- - Kumaon Himalayas Kali and Teesta rivers-- the Nepal Himalayas. Teesta and Dihang rivers -- Assam Himalayas

14. The Purvachals The Brahmaputra marks the eastern-most boundary Beyond the Dihang gorge, the Himalayas bend sharply to the south and are known as the Purvachal or the Eastern hills and mountains. These hills are mostly composed of strong sandstones, which are sedimentary rocks and are covered with dense forests. The Purvachal comprises the Patkai hills, the Naga hills, the Manipur hills and the Mizo hills.

15. Gorges

16. The Northern Plain Formed by the interplay of the three major river systems — the Indus , the Ganga and the Brahmaputra along with their tributaries. Formed of alluvial soil - The deposition of alluvium over millions of years, formed this fertile plain. The northern plains have an area of 7 lakh sq. km , about 2400 km long and 240 to 320 km broad. It is a densely populated physiographic division due to rich soil cover combined with adequate water supply and favourable climate.

17. The Northern Plains In the lower course, the velocity of the river decreases which formation of riverine islands . Majuli in Brahmaputra is the largest inhabited riverine island. Due to silt deposition many distributaries are there. It is broadly divided into three sec tions , The Punjab Plains ,the Ganga Plains, the Brahmaputra Plains. The Punjab plains are formed by the Indus and its tributaries namely the Jhelum, the Chenab, the Ravi, the Beas and the Satluj . This section of the plain is dominated by the doabs. ‘Doab’ is made up of two words ‘do’ meaning two and ‘ab’ meaning water.

18. Distributaries and Doabs

19. The Northern Plains These vast plains also have diverse relief features . Bhabar : deposit pebbles in a narrow belt of about 8 to 16 km, all the streams disappear in this bhabar belt. Terai: the streams and rivers re-emerge and create a wet, swampy and marshy region. It is a region of thick forest and wildlife, Dudhwa National Park is located here. Bhangar : Formed of older alluvium, lies above the floodplains of the rivers and presents a terracelike feature. It contains calcareous deposits , locally known as kankar . Khadar: Formed of newer and younger deposits of the floodplains. It is renewed almost every year and so are fertile.

20. Relief Features of the Northern Plains

21. The Peninsular Plateau It is a tableland composed of the old crystalline, igneous and metamorphic rocks. It was formed due to the drifting of the Gondwana land. Two broad divisions are the Central Highlands and the Deccan Plateau. The Central Highland- north of the Narmada river, covering a major area of the Malwa plateau. The Vindhyan range is bounded by the Satpura range in the south, the Aravalis on the northwest, westward extension gradually merges with the desert of Rajasthan.

22. The Peninsular Plateau The Sind, the Betwa and the Ken are the rivers draining from southwest to northeast, The eastward extensions are known by Bundelkhand and Baghelkhand . The Chotanagpur plateau marks the further eastward extension, drained by the Damodar river.

23. India – Physical Features

24. The Peninsular Plateau The Deccan Plateau is a triangular landmass that lies to the south of the river Narmada. The Satpura range in the north, the Mahadev, the Kaimur hills and the Maikal range in the east. Northeast- the Meghalaya, Karbi-Anglong Plateau and in the north Cachar Hills. Three prominent hill ranges are the Garo, the Khasi and the Jaintia Hills.

25. Western Ghats and Eastern Ghats Western Ghats It marked the western boundary - from Gujarat to Kerela . They are regular stretch of highland. More in height i.e. from 900-1600m. More rainfall- orographic rainfall. Highest peaks are Anai Mudi , followed by Doda Betta Eastern Ghats It marked the eastern boundary from Orissa to Kerela . They are dissected by rivers and irregular less than western ghats ranging from 600-900m. Rainfall is less -the monsoon winds move parallel to the eastern ghats Highest peak of eastern ghats is Mahendragiri

26. Peninsular Plateau The distinct feature is the black soil area known as Decean Trap. This is of volcanic origin, hence, the rocks are igneous. These rocks have denuded over time and are responsible for the formation of black soil Famous hill stations are Udagamandalam , popularly known as Ooty and the Kodaikanal .

27. The Indian Desert It lies towards the western margins of the Aravali Hills. It is an undulating sandy plain covered with sand dunes. This region receives very low rainfall below 150 mm per year. It has arid climate with low vegetation cover. Streams appear during the rainy season. Luni is the only large river Barchans (crescent-shaped dunes) cover larger areas

28. Barchans

29. The Coastal Plains Western Coastal Plains lying towards west between western ghats and Arabian sea belt of plains is narrow in width less fertile - no major rivers Receive more rainfall divided into Konkan Coast,Kannad Coast and Malabar Coast Eastern Coastal Plains lying towards the east between eastern ghats and Bay of Bengal comparatively wider very fertile due to many rivers Receive comparatively less rainfall divided into Northern Circars and Coromandal Coast

30. The Islands Lakshadweep Islands lying close to the Malabar coast of Kerala. It composed of small coral isalnds . Earlier they were known as Laccadive, Minicoy and Amindive . In 1973 , these were named as Lakshadweep. It covers small area of 32 sq km . Kavaratti island is the administrative headquarters The Pitti island has a bird sanctuary.

31. Corals Coral polyps are short-lived microscopic organisms, They live in colonies, They secrete calcium carbonate. The coral secretion and their skeletons from coral deposits in the form of reefs: E.g. barrier reef. fringing reef and atolls.

32. Andaman and Nicobar islands Bigger in size and are more numerous and scattered. Divided into two broad categories – The Andaman in the north and the Nicobar in the south. These islands are the elevated portion of submarine mountains. Great diversity of flora and fauna are there and equatorial climate and has thick forest cover. India’s only active volcano is found on Barren island.

33. India’s active volcano

34. Physiographic Divisions The mountains - major sources of water and forest wealth. The northern plains - the granaries of the country. The plateau - storehouse of minerals The coastal region and island groups - sites for fishing and port activities the diverse physical features of the land have immense future possibilities of development

35. Chapter -2: Physical Features of India  Mountain Ranges : The Karakoram, The Zasker , The Shivalik, The Aravali , The Vindhya, The Satpura , Western & Eastern Ghats  Mountain Peaks – K2, Kanchan Junga , Anai Mudi  Plateau - Deccan Plateau, Chotta Nagpur Plateau, Malwa Plateau  Coastal Plains - Konkan,Kannad , Malabar, Coromandal & Northern Circar (Location and Labelling) Map Work