In glacial geography, what feature is created by the process of glacial erosion?

The formation of hanging valleys is a distinctive feature resulting from glacial erosion. This process occurs when a smaller glacier flows into a larger glacier or the main valley glacier. As the larger glacier erodes the land more deeply, it creates a U-shaped valley. The smaller glacier, which doesn't erode as significantly, remains elevated relative to the main valley. When the ice retreats, the smaller valley is left hanging above the main valley, resulting in a hanging valley.

In contrast, plateaus are typically formed through processes such as volcanic activity or the uplift of land, rather than specifically glacial erosion. Flatlands can arise from various geological processes, including sedimentation and weathering, and are not a direct result of glacial activity. Sand dunes, on the other hand, are formed by the wind's movement of sand and are not associated with glaciers at all. Thus, the unique characteristics of hanging valleys clearly align with the effects of glacial erosion.