Which risk is heightened when coastal upwelling is abnormally reduced due to persistent high atmospheric pressure?

💡 Explanation

When upwelling is reduced, nutrient replenishment from deep ocean layers decreases because the pressure gradient driving vertical water movement weakens, resulting in decreased marine phytoplankton productivity. Therefore reduced productivity results, rather than flooding, mangrove expansion, or red tides which are linked to nutrient excess or different water conditions.

• Which risk increases near subduction zones following a major shallow-focus earthquake?
• Which mass wasting process causes lobate terraces to form down slope in arctic environments?
• Which slope deformation is most directly attributable to thawing permafrost layer above an impermeable frozen subsurface?
• Which seismic consequence primarily occurs when the lower plate melts during subduction under the overriding plate?
• Which process strongly influences nutrient distribution within an ocean gyre's convergence zone?
• Which erosional feature results from differential freeze-thaw weathering within a glacial cirque headwall?