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← GeographyWhich risk increases when coastal sediment transport stops due to a dam interrupting longshore drift?
A)Increased landward marine erosion✓
B)Enhanced phytoplankton photosynthesis
C)Reduced local mangrove propagation
D)Decreased seismic activity incidence
💡 Explanation
Increased marine erosion occurs because the interruption of sediment via longshore drift starves beaches; therefore, erosion increases rather than biological aspects like mangrove change, because wave energy focuses on a smaller sediment budget.
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