Optionals IAS Mains Geography: Questions 1185 - 1197 of 1537

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Question 1185

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Explain the methods of wind erosion. How these methods lead to formation of erosional and depositional landform? (Marks 30)

Explanation

Wind Erosion

  • Wind erosion is largely controlled by (i) Wind velocity (ii) nature & amount of sand, dusts and pebbles (v) humidity, rainfall amount & temperature.
  • Unlike rivers & glaciers, winds erode the rocks from all sides because of their variable direction.

Wind Erosion Occurs in Three Ways

(i) Deflation

(ii) Abrasion sandblasting

(iii) Attrition

(i) …

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Question 1186

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Write a Note on Principles of Remanent Magnetization

Explanation

Principles of Remanent Magnetization

  • The geocentric axial dipole magnetic field represents of the earth՚s total magnetism, the remaining portion is represented by regular, scattered & weak magnetic fields.
  • There is concentration of magnetism in the rocks of the core of the earth, in the shape of a bar magnet (& hot an actual bar magnets) because of …

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Question 1187

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Explain how Wegner՚s theory was the pioneer in formation of continents? Support you answer with the fact that Wegner՚s theory was superseded by plate tectonics and sea floor spreading (Marks 25)

Explanation

Wegener՚S Theory

  • The “Continental Theory of Wegner” grew out of the need of explaining the major variations of climate in the past.
  • Wegner opted for second alternative i.e.. the climatic zones remained stationary & the landmasses might have been displaced & drifted.
  • Following Edward Suess, he believed that the outer layer of “sial” / continents were f…

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Question 1188

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Write short notes on Strike and Dip

Explanation

Dip and Strike

The inclination of the rock beds, with respect to the horizontal plane is termed as dip.

The Strike and Dip

Deriving Two Information About the Dip

  • The direction of maximum slope down a bedding plane.
  • The angle between the maximum slope & the horizontal plane.
  • The direction of dip is measured by its line bearing in relation to east or west …

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Question 1189

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Write note on Supernova theory by Lyttleton

Explanation

Supernova Theory by Lyttleton

  • In 1937 - 1940 Ray Lyttleton postulated that a companion star to the sun collided with a passing star. Lyttleton showed that terrestrial planet were too small to condense on their own, so suggested one large (very) proto – planet broke into two because of rotational instability, forming, Jupiter & Saturn, with a connect…

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Question 1190

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Why ocean water tends to move pole ward from equator and equator ward from poles?

Explanation

Ocean Water Movement

Rotation of Earth

  • First main reason is rotation of earth on their axis.
  • A larger area of earth is covered with water and earth rotates on their axis from west to east at higher speed and water in equatorial region cannot maintain their pace with earth rotation and a larger volume of water starts moving in opposite direction of ear…

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Question 1191

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Tropical Forest Research Institute, Jabalpur

Question 1192

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Mahatpur Village (Purba Medinipur District)

Question 1193

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Siang River

Question 1194

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Bru Reang Agreement (Law and Order, PIB)

Question 1195

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Locust Attack

Question 1196

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Indian Institute of Toxicology Research (IITR) , Lucknow

Question 1197

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Kandhamal District