Which risk increases when deep ocean upwelling stagnates?

💡 Explanation

Coastal desertification increases because phytoplankton depend on upwelling for nutrients; a stagnation interrupts the nutrient transport via **convection**, which is essential for sustaining marine ecosystems, therefore damaging coastal regions rather than increasing circulation.

• Which mechanism causes surface-level convergence of water in the center of ocean gyres?
• Which risk increases when surface salt accumulation blankets desert soils?
• Which geological feature primarily results from mantle upwelling during oceanic plate subduction?
• Which process decreases when glacial freshwater reduces salinity?
• Which outcome often occurs when differential stress builds along transform plate edges?
• Which risk increases when warming temperatures degrade permafrost beneath Arctic infrastructure supports?