Which outcome results when coastal upwelling weakens unexpectedly along the western coastline of South America?

💡 Explanation

When coastal upwelling weakens, nutrient transport from deep ocean layers to the surface decreases because wind-driven surface water replacement diminishes, limiting phytoplankton growth. Therefore, phytoplankton biomass declines, rather than an increase in fog, strengthened trade winds, or reduced thermocline depth, which require different atmospheric conditions.

• Which risk increases when an oxbow lake forms close to agricultural land?
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