Final answer:
Upwelling is the process of nutrient-rich deep ocean water rising to the surface due to prevailing winds along coastlines, enhancing marine productivity.
Explanation:
Upwelling is the rising of deep ocean waters to the surface when prevailing winds blow along surface waters near a coastline. It brings nutrient-rich deep water to the surface, stimulating primary production and leading to high productivity in marine ecosystems. Coastal upwelling is associated with commercial fishing grounds due to the nutrient enrichment it provides.
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