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Geography

Which outcome happens when coastal river discharge increases significantly?

A)Increased stratification via freshwater lid
B)Decreased coastal sediment deposition rates
C)Reduced upwelling nutrient availability offshore
D)Weakened nearshore tidal current amplitude

💡 Explanation

Increased river discharge creates a buoyant freshwater layer at the surface, inhibiting vertical mixing; this is stratification. Because freshwater is less dense than saltwater, a freshwater lid forms; therefore stratification increases rather than other dynamics such as sediment alteration resulting.

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