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← GeographyWhich geological event results when isostatic rebound lags glacier melt?
A)Submerged fjord threshold deepening seaward✓
B)Accelerated continental crust subduction rates
C)Increased frequency of submarine turbidites
D)Elevated hydrothermal vent activity regions
💡 Explanation
Deeper fjord entrances occur because isostatic adjustment (uplift) after glacial unloading is slower than the rate of ice melt. The bedrock at the fjord mouth remains submerged, rather than rising uniformly, thus leading to deeper submerged thresholds forming.
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