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← GeographyWhich mechanism forms a moraine-dammed lake during deglaciation?
A)Isostatic rebound exceeding sediment deposition
B)Glacial till obstructs meltwater drainage✓
C)Erosion exceeding the basal channel elevation
D)Accelerated weathering of surrounding bedrock
💡 Explanation
Glacial retreat causes meltwater to accumulate behind a moraine through deposition, therefore creating a lake because the moraine impedes drainage, rather than rebound which affects regional land elevation.
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