Which morphological feature indicates increased glacial erosion within a cirque basin?

💡 Explanation

When glacial erosion is increased, the freeze-thaw weathering processes concentrated at the headwall of a cirque are accelerated because the bergschrund enhances meltwater penetration. Therefore a pronounced, steep headwall with bergschrund results from greater erosion, not shallower troughs, roches moutonnées (indicative of abrasion), or hanging valleys (related to tributary glaciers).

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