Which one among the following statements about 'Drumlin' is correct? (a) It is a streamlined hill moulded in glacial drift on the till plains. (b) It is a city located in central Europe. (c) It is a river. (d) It is a narrow road in Tibet.

A drumlin is a streamlined, oval-shaped hill formed by glacial action. These landforms are primarily composed of glacial till, which is unsorted rock debris deposited by moving ice [1]. Drumlins are typically found in groups known as swarms on till plains, creating a 'basket of eggs' topography [4]. They are characterized by a blunt 'stoss' end facing the direction of the glacier's onset and a gentler, tapered 'lee' slope on the downstream side [2][4]. This streamlined shape is the result of subglacial processes where the ice moulds the underlying drift to enhance flow with minimum drag [1]. Drumlins serve as significant geomorphological indicators, as their long axes align parallel to the direction of former ice movement [1][3]. They are distinct from other glacial features like eskers, which are sinuous ridges of sand and gravel [4].

Sources

1. [1] FUNDAMENTALS OF PHYSICAL GEOGRAPHY, Geography Class XI (NCERT 2025 ed.) > Chapter 6: Landforms and their Evolution > Drumlins > p. 56
2. [4] Certificate Physical and Human Geography , GC Leong (Oxford University press 3rd ed.) > Chapter 6: Landforms of Glaciation > Landforms of Glaciated Lowlands > p. 64
3. [2] FUNDAMENTALS OF PHYSICAL GEOGRAPHY, Geography Class XI (NCERT 2025 ed.) > Chapter 6: Landforms and their Evolution > Drumlins > p. 57
4. [3] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 17: Major Landforms and Cycle of Erosion > Drumlin > p. 233