Which topographic feature is primarily formed by glacial erosion within a cirque?

💡 Explanation

When a glacier occupies a cirque, glacial erosion sculpts a bowl-shaped depression that can later hold meltwater because the ice scours the bedrock, thereby forming a tarn lake. Therefore, a tarn lake is commonly found within a cirque, rather than U-shaped valleys, hanging valleys, or arête ridges which require larger-scale glacial valley systems.

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