Published on December 27, 2013
Abhishek Singh Ix - B
PHYSIOGRAPHIC UNITS OF INDIA S.NO UNITS AREA KM (Sq) (appro) % OF TOTAL AREA 01 Northern mountains 578,000 17.9 02 Great Plains 03 Thar Desert 175,000 5.4 04 Central Highlands 336,000 10.4 05 Peninsular Plateaus 1,241,000 38.5 06 Coastal Plains 335,000 10.4 07 Islands 550,000 8,300 17.1 0.3 ABHISHEK
TIME FORMAT Geographical Set Up: India takes its standard time from the meridian of 82 30 E, which is 5 ½ hours ahead of Greenwich Mean time ( 0 longitude).Pakistan time is 5 hours ahead of GMT and Bangladesh time is 6 hours ahead of GMT. ABHISHEK
ITS LOCATION Significance of Location: Barring the plateau of Baluchistan (which form part of Pakistan), the two great ranges of Sulaiman and Kirthar cut it off from the west. Along the north, the great mountain wall formed by the Hindukush, Karakoram and the Himalayas, which is difficult to cross, cuts it off from the rest of the continent. Similarly, the southward of-shoots of the Eastern Himalayas separate it from Russia. The tropical monsoon climate of India, which ensures a fair supply of moisture and forms the basis of farming in India, is also a result of its location in the southern part of Asia. Since the opening of Suez Canal (1867) India’s distance from Europe has been reduced by 7,000km. It thus bridges the space between the highly industrialized nation of the west and the semi-arid, and south-western Asia and the most fertile and populated regions in the south-east and far-east countries. ABHISHEK
1. Tropical Rainy climate Region: This region has consistently even temperature, which stays above 18 C even in December, April, and May are the hottest months, the temperature varying from 18 C to 27 C. July and August are the coolest months, which copious rainfall. The average rainfall exceeds 250cm, which encourages wet evergreen forests. The western coastal strip, Western Ghats, south of Bombay, Meghalaya, western Nagaland and Tripura come in this climatic region. 2. Tropical Savanna Region: The chief feature of this climate is the long dry period. Temperature even in winter stay above 18 C, and in summer may even go up to 46 c. Rainfall, except in the southeastern parts, is in summer and averages about 100cm. In the south eastern parts, the retreating monsoons bring sufficient rains. A major part of the southern peninsula, except the arid tract lying east of the Western Ghats, northeastern Gujarat, south Bihar, major parts of Madhya Pradesh, Orissa, northern Andhra Pradesh, eastern Maharastra, and eastern TamilNadu coast come under this region. 3. Tropical Steppe Region: The average temperature is over 27 C, the lowest temperature being about 23 C April and May are the hottest months, when temperature may rise over 30 C. Average rainfall being less than 75cm, the region comprises a part of the famine zone of the country. The southwest monsoons bring rain to this region. The region comprises the rain shadow areas lying east of the Western Ghats and covers Karnataka, interior TamilNadu, western Andhra Pradesh and central Maharastra, ABHISHEK
4. Sub-Tropical Steppe Region: The average temperature rises over 27 C and as high 48 C is recorded during summer. Rainfall from the southwest monsoon averages between 50 to 75 cm. It often fails, leading to widespread drought conditions. This region comprises tracts stretching and encompassing western Rajasthan and northern Gujarat. 5. Tropical Desert Region: The summer Temperature rises over 48 C, while in winter it goes down to 1 C. May and June are the hottest months. Average rainfall is 12.5 cm and very unreliable. Excessive evaporation during summer and intense cold during winter hinder crop production except through river irrigation. Western Rajasthan and parts of Kutch, which are purely sandy plains, come in this region. 6. Humid Sub-Tropical Region: Summer temperatures are 46 C to 48 C. Average rainfall, mostly from summer monsoons, is about 62.5 cm, which increases to over 250cm in the east. Winters are virtually dry. This region is spread over the foothills of the Himalayas, eastern Rajasthan, plains of U.P, Bihar, northern Bengal, part of Assam and Arunachal Pradesh. 7. Mountain Region: Average temperature in June is 15 C to 17 C, in winter it goes below 8 C. On the northern slopes of the Himalayas, the rainfall is scanty, about 8-10 cm, but the western slopes enjoy a heavy rainfall of over 250 cm. The entire Himalayan belt ABHISHEK comprising both the trans-Himalayas and the main Himalayas come under this region.
The Punjab-Haryana Plain: These plains owe their formation to the Sutlej, the Beas and the Ravi rivers. Many low lying flood plains (called bets) are found here. The Bari Doab between Ravi and Beas rivers, the Bist Doab between the Beas and Sutlej and the Malwa plain are relatively more fertile plain. The Ganga Plain: The Ganga-Yamuna Doab comprising the Rohilkhand and the Avadh Plain is the tile area that is drained by the tributaries of Ganga. The North Bengal Plains: the Plains extending from the foot of Eastern Himalayas to the northern limb of Bengal basin cover an area of 23,000km2. Brahmaputra Plains: This is a low level plain, rarely more than 80km broad, surround by High Mountain on all sides except on the west. Significance of the Great Plains: Riverine region, Fertile soil, favorable climate, flat surface, constructions of roads, extensive system of ABHISHEK irrigation.
The Deccan Plateau: The Deccan Plateau extends from the vindhyas to the southern tip of the Peninsula. This triangle plateau is at its widest in the north. The Vindhya Range and its eastern extension namely Mahadev hills Kaimuir Hills and Maikal Range from its northern edge. Western Ghats are known by different regional names such as the Sahyadris in Maharastra and Karnataka, the niligris in Tamil Nadu and Annamalai and the Cardamon hill along the Kerala and Tamil nadu border. The elevation of the ghats increases towards the south. The highest peak, Anaimudi (2,695 m) is in Kerala. The most important gap in the Western Ghats is the Palghat gap which links Tamil Nadu with Kerala. The Bhorghat and the Thalghat are other gaps lying in Maharastra state. Eastern Ghats: These hills rise steeply from the Coromandel coastal plain. The Eastern Ghats are well developed in the region between the Godavari and Mahanadi rivers. The Eastern Ghats and Western Ghats converge in the Nilgiri hills. Dodda Betta (2,637 m) is the highest peak in the ABHISHEK
The Coastal plains: The Peninsular plateau is bounded by coastal plains on the east and west. There is wide difference between the eastern and western coastal plain. The west coast is narrower but wet. East coast much wider but relatively dry. A number of river deltas occur on the east coast. The deltas of east coast from the ‘granary’ of the five southern statesAndhra Pradesh, Tamil Nadu, Karnataka, Kerala and Pondicherry. The western coastal strips which have a large number of lagoons and back waters on other hand are noted for spices, areca nuts, coconuts palms etc. Western coastal Plain: These lies between the Western Ghats and the Arabian seas and stretch from Kutch in the north to Kanyakumari in the south. The Gujarat plain is a broad and flat plain. The Kutch Peninsula, Gulf of Kutch, and the Gulf of Cambay. The Kathiawar Peninsula, also known as Saurashtra which lies to the south of Kutch, is also a plain level area except for some hills rising into Mount Girnar. Sun-divided regionally into the Konkan coast in Maharastra Canara coast in Karnataka and Malabar Coast in Kerala. Eastern Coastal Plain: The eastern coastal low lands extend from the mouth of the Ganga to Kanyakumari. The northern half is called Northern Circars or Kalinga coast, while the southern half is known as the Coromandal coast. The border part is the Carnatic region, which is about 480 km wide. They are not suitable for harbours as their mouths being full of sit. Significance of Coastal plains: (i) Harbours (ii) Specialized crops (iii) Fisheries and Navigation (iv) Economic Influence (v) Historical Importance ABHISHEK
1.Bay of Bengal Islands: The Andaman & Nicobar group of islands are separated by 10 Degree channel. These islands have been formed by extension of tertiary mountain chain of Arakan Yoma. The Andaman group of island is divided into 3 major groups’ viz., North Andaman, Middle Andaman and south Andaman, collectively called Great Andamans. Little Andaman is separated from Great Andamans by Duncan passage. The Nicobar group of islands of which Great Nicobar is largest and southern most one. Saddle peak situated in Andaman Islands is the highest peak of Andaman & Nicobar group. The Dhuliar peak is the highest peak of Nicobar group of islands.More habitable and different origin thanofArabian sea islands. Barran island is dormant volcano and Narcondam island is extinct volcano. 2) Lakshwadeep islands: Coral- More Muslim population and have fringing reefs. They are 25 small island groups. The island’s north is known as Amindivi and spot is Cannonore island. Extreme south is Minicoy islands which is largest. ABHISHEK
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