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← GeographyFollowing a glacial retreat, which mechanism leads to the formation of a proglacial lake dammed by a moraine?
A)Isostatic rebound exceeding sedimentation rate
B)Terminal moraine deposition blocking drainage✓
C)Permafrost thaw undermining channel banks
D)Rapid weathering increasing dissolved load
💡 Explanation
Following glacial retreat, terminal moraine deposition directly blocks meltwater drainage because glaciers deposit debris as they recede, thereby creating dammed lakes. Therefore a moraine dam formation occurs, enabling a proglacial lake, rather than other processes all which require distinct conditions and would lead to different geomorphological features.
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