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← GeographyWhich outcome occurs when coastal upwelling stalls due to atmospheric conditions?
A)Deoxygenation leading to marine dead zones✓
B)Enhanced phytoplankton productivity region-wide
C)Decreased ocean acidity at the surface
D)Thermocline deepening in offshore waters
💡 Explanation
Deoxygenation occurs because oxygen consumption by microbes during decomposition increases without replenishment via upwelling, a Ventilation process. Therefore, dead zones form rather than increased productivity, acidity changes, or offshore thermocline deepening, which need sustained upwelling.
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