Which mechanism causes increased marine productivity when coastal upwelling occurs?

💡 Explanation

When upwelling occurs, nutrient transport to surface waters increases because deep ocean water is rich in dissolved nutrients like nitrates and phosphates that fertilize phytoplankton. Therefore, nutrient transport leads to increased productivity rather than increased solar absorption, oxygen concentration, or density stratification, processes requiring different stimuli.

• Which factor primarily determines the rate of floodplain aggradation in an alluvial river system?
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