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Earth & Natural Systems

Which 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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