Which glacial landform is an elongated ridge composed of sorted sand and gravel that was deposited by a subglacial stream?

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The landform described is an esker, which is formed by the deposition of sediment by a subglacial stream as the glacier retreats. Eskers are elongated ridges composed of sorted sand and gravel that can be several kilometers in length. Kames are small hills or mounds of poorly sorted sediment deposited by melting ice, drumlins are elongated hills formed by glacial ice flowing over a previously existing landscape, and kettle holes are depressions formed by blocks of ice left behind by a retreating glacier that melt and form a small pond or lake.

Which Glacial Landform Is an Elongated Ridge Composed of Sorted