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← GeographyWhich mechanism dominates barrier island migration when sediment supply decreases?
A)Landward rollover via overwash✓
B)Seaward accretion through deposition
C)Uplift from isostatic rebound
D)Lateral extension via spit building
💡 Explanation
Decreased sediment causes landward rollover because Wave-Dominated Coastal Erosion overwhelms deposition, therefore barrier islands retreat landward, rather than seaward accretion which needs sediment or uplift by other geological forces.
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