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← Earth & Natural SystemsWhich mechanism explains why increased offshore winds cause nutrient-rich upwelling along coastlines?
A)Thermal expansion increases water volume
B)Ekman transport moves surface water✓
C)Salinity gradients drive deep convection
D)Tidal forces vertically displace water
💡 Explanation
Ekman transport explains upwelling because winds exert force on the sea surface, and the Coriolis effect deflects the resultant water movement offshore. Therefore, deeper, nutrient-rich water rises to replace the surface water, rather than expansion, salinity, or tidal forces causing the effect.
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