Which depositional landform is described as a long, steep-sided curving ridge of alluvium that filled an ice tunnel beneath a glacier and was left behind when the glacier melted?

Question

Quizplus · Accepted Answer

The description matches that of an esker, which is formed by streams flowing under a glacier and depositing sediment in a tunnel-like depression. When the glacier melts, the sediment is left behind as a long, steep-sided ridge. Moraines are deposits of till (unsorted sediment) that form at the edge or underneath a glacier, kames are mounds of glacial till that accumulate in a depression on the ice, and drumlins are smooth, elongated hills that are typically oriented parallel to the direction of glacier flow. None of these match the description given.

Which Depositional Landform Is Described as a Long, Steep-Sided Curving