Which climatic effect weakens near South America during El Niño?

💡 Explanation

Coastal upwelling weakens during El Niño because the Walker circulation weakens, reducing trade winds that normally drive upwelling; therefore, nutrient-rich waters are not brought to the surface, rather than intense storms which aren't directly determined, or ozone layer changes.

• Which risk increases where fractured limestone bedrock underlies agricultural land and nitrogen-based fertilizer is heavily applied?
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