IAS (Admin.) Mains Geography: Questions 1 of 761

Appeared in Year: 2016

Describe in Detail Subjective▾

Discuss the ‘Basket of egg՚s topography’ .

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Explanation

‘Basket of Egg՚s Topography’

  • Basket of egg՚s topography is the topography of drumlins, which are generally found in clusters.
  • Drumlins are formed by the deposition of glaciers in a till plain.
    • Drumlins are formed by the deposition of glaciers in a till plain. Drumlins are both erosional and depositional in nature but predominantly depositional.
    • Drumlins are smooth oval shaped ridge-like features composed mainly of glacial till with some masses of gravel and sand. The long axes of drumlins are parallel to the direction of ice movement. They may measure up to 1 km in length and 30 m or so in height. One end of the drumlins facing the glacier called the stoss end is blunter and steeper than the other end called tail. The drumlins form due to dumping of rock debris beneath heavily loaded ice through fissures in the glacier. The stoss end gets blunted due to pushing by moving ice. Drumlins give an indication of direction of glacier movement.
  • These are swarms of oval, elongated hummocks, which are composed of boulder clay.
  • Its shape is like an inverted boat or inverted half egg. It has unsymmetrical slopes.
  • The slope is little steeper and rough in the direction of ice flow while on the leeward side slope is gentle.
  • They are low hills varying from 7 to 40 m in height and sometimes 7 to 100 m and may be 8 to 32 km long.
  • This type of topography is generally found in County Down in Northern Ireland and the glaciated plain around the Great Lakes in North America.
The Basket of Egg՚s Topography

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