SSC CHSL 2023 PYQ — Question 47

The correct answer is option 2 i.e. Drumlins.

 

Drumlins are oval-shaped, elongated hills formed by the movement of glaciers. They consist of glacial till (a mix of clay, sand, and rocks) left behind as glaciers retreat. The steeper end of the drumlin faces the direction from which the glacier came, while the gentler, tapered end points in the direction the glacier was moving.

 Explanation of Other Options:

1. Sandur:

   • Definition: Also known as outwash plains, sandur are flat areas of sand and gravel deposited by meltwater flowing from a glacier.
   • Formation: Created when glacial meltwater carries sediments and deposits them over large areas.
   • Shape: Flat and broad, not oval-shaped.

2. Moraines:

   • Definition: Accumulations of rock, soil, and debris deposited by a glacier.
   • Formation: Formed at the edges, front, or beneath glaciers as they move and retreat.
   • Types:
     • Lateral moraine (sides of glaciers)
     • Terminal moraine (end of glacier's advance)
     • Medial moraine (center, when two glaciers merge)
   • Shape: Irregular ridges or mounds, not smooth and oval-shaped.

3. Esker:

   • Definition: Long, winding ridges of sand and gravel deposited by meltwater rivers flowing beneath a glacier.
   • Formation: Created by subglacial streams within or under a glacier.
   • Shape: Sinuous (snake-like), not oval-shaped.