The correct option is Drumlin.
Explanation
Glacial landforms are categorized based on the geomorphic processes that create them. Erosional landforms result from the removal of bedrock by moving ice through plucking and abrasion. Depositional landforms are created when glaciers retreat or melt, leaving behind accumulated debris known as glacial till or outwash.
Option Analysis:
- Cirque Cirque (Incorrect): A cirque is a deep, bowl-shaped depression found at the head of a glacial valley. It is formed by glacial erosion (plucking and abrasion) and is often considered the most common landform in glaciated mountains.
- Arete Arete (Incorrect): An arete is a sharp, knife-edged ridge formed between two adjacent cirques. As the glaciers erode the valley walls on either side, the dividing ridge becomes narrow and serrated. It is an erosional feature.
- Drumlin Drumlin (Correct): Drumlins are smooth, oval-shaped, ridge-like features composed mainly of glacial till with some gravel and sand. They are formed by the deposition of material beneath a glacier. The long axis of a drumlin is parallel to the direction of ice movement, with the steeper end facing the direction from which the ice came (stoss side) and the gentler slope facing the direction of movement (lee side).
- Horn Horn (Incorrect): A horn (or pyramidal peak) is a sharp, pointed peak formed when three or more cirques erode headward into a single mountain summit. The Matterhorn in the Alps is a classic example. It is an erosional feature.
Key Takeaway:
Drumlins, Eskers, and Moraines are depositional features formed by glacial till. In contrast, Cirques, Aretes, and Horns are erosional features carved by the movement of glacial ice.