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← GeographyWhich 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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