As ice retreats by melting back, the rock debris carried by the glacier is deposited to form a relatively thin layer of till called a(n) ___________.

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Ground moraine is a type of till that is deposited by a retreating glacier. It forms a relatively thin layer of unsorted rock debris that is spread out over the ground surface. Eskers are ridges of sand and gravel that form in a glacier's meltwater channels, drumlins are teardrop-shaped hills that are formed by the deformation of subglacial sediment by the moving ice, end moraines are ridges of till that mark the furthest extent of the glacier's advance, and erratics are large boulders that have been transported by the glacier and deposited elsewhere.

As Ice Retreats by Melting Back, the Rock Debris Carried