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← GeographyWhich mechanism increases primary productivity in coastal regions when winds drive surface waters offshore?
A)Upwelling of nutrient-rich deep water✓
B)Increased solar irradiance absorption
C)Enhanced nitrogen fixation by bacteria
D)Decreased turbidity from sediment settling
💡 Explanation
When surface waters move offshore due to wind, upwelling occurs because deep, nutrient-rich water rises to replace the displaced surface water, boosting phytoplankton growth. Therefore, increased primary productivity results, rather than irradiance absorption, nitrogen fixation, or sediment settling, which depend on other circumstances.
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