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← GeographyWhich risk increases when surface ocean gyre strength lessens?
A)Diminished deep ocean nutrient upwelling✓
B)Decreased coastal erosion stability
C)Enhanced nearshore salinity stratification
D)Increased thermocline temperature convection
💡 Explanation
Decreased gyre strength diminishes Ekman transport and subsequent divergence, because the upwelling mechanism is weakened. Therefore deep ocean nutrients stay confined at depth, failing to reach surface ecosystems, rather than impacting coastal erosion or salinity directly which are nearshore processes.
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