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← GeographyWhich outcome occurs when a large phytoplankton bloom decays within a subtropical gyre?
A)Hypoxic zone expansion in deep waters✓
B)Increased coastal upwelling intensity surge
C)Enhanced carbon sequestration burial rates
D)Accelerated formation terrigenous sediment layers
💡 Explanation
Hypoxic zones expand due to the increased oxygen consumption via decomposition. Bacterial respiration is fueled by the bloom's organic material, therefore oxygen decreases significantly at depth, rather than increasing burial rates or affecting upwelling at the coast.
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