Which risk increases along South America during an El Niño event?

💡 Explanation

Coastal flooding and erosion becomes more likely because El Niño results in a weaker thermocline slope causing the poleward-moving undercurrent to be shallower, reducing cold-water upwelling and enabling storm surges, rather than increasing upwelling or carbon sequestation.

• Which mechanism forms elevated cave entrances over time?
• Which consequence results when rapid sedimentary deposition occurs on an alluvial plain during seasonal flooding?
• Which risk increases when water table drawdown lowers buoyant support in subterranean karst regions overlying urban infrastructure?
• Which landform often results when deflation lowers ground surfaces?
• Which effect occurs when wind speed decreases abruptly after saltation?
• Which effect accelerates oxbow lake formation as a fluvial meander migrates laterally?