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← GeographyWhich mechanism causes deep ocean nutrient upwelling along coastlines experiencing offshore winds?
A)Ekman transport driving surface divergence✓
B)Geostrophic currents creating pressure gradients
C)Thermohaline overturning due to density changes
D)Tidal forces generating internal wave mixing
💡 Explanation
When offshore winds blow along a coastline, Ekman transport occurs because the Coriolis effect deflects the surface water 90 degrees, resulting in surface water moving away from the coast. Therefore Ekman transport-driven surface divergence induces upwelling, rather than pressure gradients, thermohaline overturning, or tidal mixing, which have distinct mechanistic origins affecting broader regions.
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