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← GeographyWhich mechanism initiates rapid glacial calving when glacial meltwater flow increases?
A)Basal lubrication reduces ice friction
B)Crevasse propagation increases ice fracturing✓
C)Isostatic rebound uplifts glacial termini
D)Cryoconite melting enhances surface ablationrate
💡 Explanation
Increased water flow enlarges and extends surface crevasses via hydrofracturing because water pressure overcomes ice tensile strength, therefore promoting ice fracturing, rather than lubrication or ablation which more gradually weaken the structure.
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