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Which risk increases concerning marine oxygen levels during increased glacial melting near fjords?

A)Coastal dead zone extent expands
B)Thermocline layer equilibrium dissipates fully
C)Ocean acidification effects rapidly reverse
D)Deep ocean upwelling becomes more frequent

💡 Explanation

Coastal dead zone extent expands because meltwater flux increases leading to stratification and reduced vertical mixing, which is a process of density-driven downwelling. Therefore, coastal zone hypoxia worsens, rather than reversing the effects because the oxygen resupply is diminished.

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