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← GeographyWhich risk increases along the Peruvian coast during deep thermocline El Niño phases?
A)Anoxic zone expansion nearshore✓
B)Increased coastal erosion intensity
C)Intensified nearshore upwelling events
D)Decreased frequency of red tides
💡 Explanation
El Niño suppresses upwelling, preventing nutrient replenishment from deep water; therefore, the lack of oxygen from decomposition near the surface increases the size of coastal anoxic zones due to reduced mixing, rather than increased upwelling.
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