Glaciers do not form long, smooth hills. Instead, they shape existing hills into long, smooth features called drumlins.

Here's how it happens:

* Glacial Erosion: As a glacier moves, it erodes the underlying bedrock and sediment.

* Glacial Deposition: The eroded material is transported by the glacier and deposited further down-ice.

* Drumlin Formation: When a glacier encounters a rise in the terrain, it can pile up the deposited material into an elongated, streamlined hill. This hill is called a drumlin.

Key Characteristics of Drumlins:

* Elongated Shape: Drumlins are typically elongated in the direction of ice flow.

* Smooth, Rounded Shape: They have a smooth, rounded profile, sculpted by the erosive power of the glacier.

* Asymmetrical Profile: One side of the drumlin is typically steeper than the other, facing the direction from which the ice flowed.

Drumlins are common in areas that were once covered by glaciers, such as the Great Lakes region of North America and the British Isles. They provide valuable clues about the direction and movement of past glaciers.