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← GeographyWhich outcome primarily occurs from downwelling's cascading effect in oceanic currents?
A)Enhanced surface nutrient concentration
B)Reduced deep water oxygen levels✓
C)Increased phytoplankton photosynthesis rates
D)Stabilized thermocline layer formation
💡 Explanation
Reduced deep water oxygen levels will be seen in areas with strong downwelling. This stratification traps low-oxygen water at depth via advection, because it prevents vertical mixing and therefore, the bottom layer's oxygen depletion increases rather than oxygenated water being delivered.
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