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Which of the following statements are concerned with eskers and drumlins? 1. Eskers are ridges of crudely bedded gravels and sands. 2. Drumlins are constituted mostly of boulder and clay. 3. Basket of eggs topography is the characteristic of terrains with eskers. 4. While eskers are built by glacier streams, drumlins result from glacier action. Choose the correct answer from the options given below.

Which of the following statements are concerned with eskers and drumlins? 1. Eskers are ridges of crudely bedded gravels and sands. 2. Drumlins are constituted mostly of boulder and clay. 3. Basket of eggs topography is the characteristic of terrains with eskers. 4. While eskers are built by glacier streams, drumlins result from glacier action. Choose the correct answer from the options given below. Correct Answer <span style="">1, 2 and 4</span>

The correct answer is 1, 2 and 4.

Key Points

  • Drumlins and Eskers are both hilly glacial landforms. However, they differ in shape.

Eskers

  • Eskers When glaciers melt in summer, the water flows on the surface of the ice or seeps down along the margins or even moves through holes in the ice.
  • These waters accumulate beneath the glacier and flow like streams in a channel beneath the ice. Such streams flow over the ground (not in a valley cut in the ground) with ice forming its banks. Statement 4 is correct.
  • Very coarse materials like boulders and blocks along with some minor fractions of rock debris carried into this stream settle in the valley of ice beneath the glacier and after the ice melts can be found as a sinuous ridge called esker.
  • Statement 1 is correct.

Drumlins

  • Drumlins are smooth oval shaped ridge-like features composed mainly of glacial till with some masses of gravel and sand. Statement 3 is not correct
  • 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.
  • Hence statement 4 is correct.
  • Drumlins give an indication of direction of glacier movement.
  • Drumlins are constituted mostly of boulder and clay.
  • Statement 2 is correct.

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