Which outcome is accelerated in coastal regions by downwelling circulation?

💡 Explanation

Oceanic downwelling drives nutrient-rich surface water downwards. Because this traps organic matter on the sea floor, microbial respiration consumes limited oxygen. Therefore, the lack of oxygen fosters benthic sediment anoxia, rather than supporting blooms, and upwelling, rather than downwelling conditions would reduce anoxia.

• Which outcome occurs when a large iceberg melts within the relatively stable Western Pacific Gyre?
• Which feedback arises when increased rainfall rapidly saturates soluble bedrock, forming new sinkholes?
• Which outcome occurs in a delta region when artificial levees prevent seasonal flooding?
• Which risk increases when prolonged carbonic acid forms?
• Which mechanism causes land subsidence when groundwater is extracted from aquifers near a fault line?
• Which mechanism triggers a tsunami when a subsea thrust fault ruptures during a megathrust earthquake?