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 results when thaw cycles in permafrost increase rate of solifluction?
• Which phenomenon most directly causes the formation of deep-sea trenches along subduction zones?
• Which mechanism primarily concentrates rare earth elements during carbonatite magma volcanism?
• Which risk increases along subduction zones following prolonged tectonic quiet?
• Which erosional process primarily enlarges existing cirques in alpine regions experiencing freeze-thaw cycles?
• Which mechanism amplifies atmospheric subsidence during an El Niño event in the eastern Pacific?