Optionals IAS Mains Geography: Questions 1185 - 1197 of 1537
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Question 1185
Describe in Detail
Essay▾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
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
Describe in Detail
Essay▾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 Support you answer with the fact that Wegner՚s theory was superseded by plate tectonics and sea floor spreading (Marks 25)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
Explanation
Dip and Strike
The inclination of the rock beds, with respect to the horizontal plane is termed as 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
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
Describe in Detail
Essay▾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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