Which mechanism leads to a tarn formation within a glacial cirque after deglaciation?

💡 Explanation

When a glacier erodes a cirque, the over-deepening mechanism results because glacial plucking and abrasion carve out steeper and deeper hollows, creating an enclosed depression. Therefore a tarn forms due to the depression filling with meltwater, rather than rebound, weathering, or solifuction, which require alternate processes.

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