Which morphological outcome arises during the transition when multiple cirques erode a mountain mass?

💡 Explanation

When multiple cirques erode from different sides of a mountain, headwall retreat occurs because glacial processes carve amphitheater-like depressions into the mountain's upper reaches, converging to form a sharp summit. Therefore a pyramidal peak forms, rather than floodplains, braided rivers, or alluvial fans which are caused by fluvial rather than glacial processes.

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• Which outcome arises when a major river's stream gradient decreases due to regional tectonic subsidence?