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← GeographyWhich ecosystem change results from persistent longshore drift across a bay mouth?
A)Erosion leading to barrier island creation✓
B)Increased offshore upwelling of nutrients
C)Decreased salinity in the open ocean
D)Enhanced formation of underwater volcanoes
💡 Explanation
Longshore drift causes sediment transport along the coast; that sediment accumulates to create a spit or barrier island. These formations reduce the tidal flushing because the sediment deposition rate exceeds erosion, therefore facilitating island formation, rather than increasing upwelling.
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