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← GeographyWhich sediment transport outcome results when coastline is blocked?
A)Accumulation upstream of groin structures✓
B)Increased offshore turbidity currents
C)Elevated regional subsidence rates
D)Decreased regional isostatic rebound
💡 Explanation
Sand accumulates upstream when a groin disrupts longshore drift, because the sediment's lateral movement is stopped by the barrier; an action categorized as deposition rather than suspension; therefore sediment builds on the upstream rather than being carried away.
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