At continental coasts, which physical mechanism naturally brings nutrients from deep to the surface?
Upwelling caused by ocean currents
Along many continental coasts, winds blowing parallel to the shore push surface water away from the coast. To replace this displaced water, cold, nutrient-rich water rises up from deeper layers of the ocean, a process called coastal upwelling.
Planetary winds at the equator drive equatorial upwelling only in specific zones, not along most continental coasts. Movement of surface water alone stays near the surface and does not lift deep nutrients up, and salinity stratification actually stabilises the layers and resists vertical mixing. Only ocean-current-driven upwelling brings nutrients from deep to the surface at the coasts.
Hence, the answer is Upwelling caused by ocean currents.
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