Which shift results when El Niño reduces upwelling?

💡 Explanation

Biological productivity suffers during ENSO events; nutrient upwelling diminishes due to weakening trade winds and thermocline suppression. This initiates nutrient depletion, so therefore marine productivity sharply declines because fewer nutrients reach the surface, rather than uniformity or sea-level change.

• Which risk increases when rapid aggradation buries alluvial sediments?
• Which erosional result characterizes coastlines when sand barriers impede wave energy?
• Which outcome occurs following crust formation on dunes?
• Which risk increases when concentrated rainwater infiltrates karst landscapes used for intensive agriculture?
• Which secondary effect is likely when liquefaction occurs due to earthquake shaking in regions with levees?
• Which mechanism causes localized crustal thinning at continent-continent convergent boundaries after initial collision?