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← GeographyWhich outcome results when the ocean's mixing layer weakens?
A)Algal bloom intensity increases rapidly✓
B)Deeper water temperature variance reduces swiftly
C)Thermocline gradient reverses entirely seasonally
D)Surface salinity levels equalize drastically
💡 Explanation
An unstable mixing layer hinders nutrient cycling via *turbulent diffusion*, because deep nutrients reach the surface less effectively; therefore, phytoplankton are nutrient-limited, and algal booms intensify rather than thermocline reversal, equalization, or temperature variance reduction under prevailing conditions.
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