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← GeographyWhich outcome occurs when density stratification weakens within oceanic basins?
A)Reduced abyssal plain sediment accumulation
B)Decreased biological productivity upwelling✓
C)Increased coastal erosion protection
D)Enhanced methane hydrate formation
💡 Explanation
Weakened density stratification reduces vertical water mixing; this diminishes nutrient upwelling, decreasing phytoplankton and overall productivity because surface resources are not replenished. Therefore, reduced productivity is observed, rather than changes in sediment processes or methane activity which are controlled by geological rather than circulation dynamics.
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