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Geography, Nature, and Weather

The Northern Great Plains of India

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The great plains lie between the mountains of the north and the peninsular plateau of the south. It extends over a length of 2400 km. It has a width of 2400 km in Bihar to 500 km in Punjab.

 The Great Plains is a flat low lying land made up of Alluvium – the fine silt brought down by the rivers. The plain in the past was a huge depression where the rivers have deposited layers of alluvial sediments. The three big rivers draining this region are Indus, Ganga and Brahmaputra. They collect their water from Himalayan glaciers. The rivers cross the lofty Himalayan range through narrow deep gorges or deep canyons and enter the plains. Geologists consider that these three rivers were older than the Himalayas that as the Himalayas lifted themselves up, the rivers have eroded their valleys. The northern plains are the youngest as they are made up of sediments laid down by the denudation of the Himalayas. The surface relief of Great Plains areclassified into four types based on the structure of soil.

  • The Bhabar lies all along the foot hills of siwalik. It is a pebble – studded zone of porous beds. It is a narrow belt with 8 to 16 kms.
  • The Terai belt is marked by excessive dampness with the growth of thick forest and a variety of wild life.
  • The Bhangar is the older alluvium of the plain.
  • The Khadar is the new alluvium of the plain. They form a continuous belt of alluvium. These plains may be subdivided into the following basins. i) The Indus basin ii) The Ganga basin iii) The Brahmaputra basin iv) TheGanga – Brahmaputra Delta.
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Last Updated on Sunday, 17 November 2013 17:45

Winter Season (December to February)

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During winter, the sun is overhead in the Tropic of Capricorn. The land mass becomes cold in North India where the day mean temperature remains below 21 degree Celsius and the night temperature is about 22 degree Celsius. No obvious difference is found in the temperature during day and night.

In the meantime high pressure develops in the northwestern part of India because of prevalence of low-temperature. In contrast to this, a low pressure area forms in the South India, that is both in the Arabian Sea and the Bay of Bengal. Consequently the winds blow from the high pressure area towards South India. These winds are called the ‘Retreating monsoon winds’ which blow from land to sea and do not cause much rainfall. But these winds absorb some moisture while crossing the Bay of Bengal and gives winter rainfall to Tamil Nadu and South Andhra Pradesh.

During this period, a low pressure depression originates over the Mediterranean Sea and travel eastwards across Iran and Pakistan and reach India. This low pressure depressions are called ‘Western disturbances’. The Jet stream plays a dominant role in bringing these disturbances to India. These disturbances cause rainfall in Punjab, Haryana and Himachal Pradesh and snowfall in the hills of Jammu and Kashmir. This rainfall is very useful for the cultivation of wheat

http://tnpsc.wordpress.com/2012/12/14/winter-season-december-to-february/
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Last Updated on Monday, 17 December 2012 02:19

WATER-A BASIC NECESSITY OF LIFE

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WATER  IS ESSENTIAL TO ALL FORMS OF LIFE AS WE ALL KNOW...IN THE WORLD OF CHEMISTRY..AS IT IS ONE OF THE INTERSTING SUBJECT...IS MOST COMMON,ABUNDANT N EASILY OBTAINABLE OF ALL CHEMICAL COMPOUNDS..!!!!!...IT IS REGARDED AS A UNIVERSAL SOLVENT....!!!!! IT CAN EASILY BE TRANSFORED FROM ONE FORM TO ANOTHER...
IT IS AN IMPORTANT COMPONENT OF ANIMAL AND VEGETABLE MATTER AND PLAYS A VITAL ROLE IN THERE VITAL PROCESSES....SUPPOSE, A LIFE WITHOUT WATER...CAN WE LIVE ON THIS WORLD...WITHOUT WATER...???????? OBVOUSLY THE ANSWER IS NOOOO.....
WATER CONSTITUTES ABOUT 65% OF OUR BODY....N IS AN ESSENTIAL FOR OUR GROWTH...SOME PLANTS HAVE 95% WATER...
IT HAS TETRAHEDRAL ARRANGEMENT WITH OTHER WATER MOLECULES....ITS DENSITY AT 4 DEGREE CELCIUS IS MAXIMUM.....!!!!!!
THERE ARE TWO TYPES OF WATER-
1) SOFT WATER
2) HARD WATER
NOW THE QUESTION IN OUR MIND THAT WHAT IS HARD WATER N WHAT IS A SOFT WATER...?>????
LET ME EXPLAIN...
1)SOFT WATER- THE WATER WHICH GIVES LATHER WITH SOAP IS CALLED AS SOFT WATER...FOR EX.- RAIN WATER,DISTILLED WATER...ETC...
2) HARD WATER-THE WATER WHICH DO NOT GIVES LATHER WITH SOAP IS CALLED AS HARD WATER....FOR EX-RIVER WATER,TAP WATER...ETC.....
SO THIS IS THE CONCEPT OF WATER IN SHORT...!!!!!!!!!!!
                    
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Last Updated on Monday, 26 December 2011 05:43
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