Which outcome occurs when an eruption column collapses?

💡 Explanation

A pyroclastic density current forms because gravitational instability causes a volcanic eruption column to collapse and produce a ground-hugging flow of hot fragments and gases via **gravitational collapse**. Therefore, a density current forms rather than ozone increase which involves chemistry, or a shield-volcano due to lava flows, or a glacial cirque involves erosion.

• Which process causes a deep-water trench where an oceanic plate subducts under a continental plate?
• Which outcome occurs when an oceanic eddy detaches from major gyres?
• Which triggers rapid sinkhole formation above limestone bedrock?
• Which effect is directly caused by the stick-slip mechanism along transform plate boundaries?
• Which consequence results when excessive groundwater extraction lowers the water table beneath an alluvial aquifer?
• Which mechanism causes thermohaline circulation slowdown in a freshwater glacial lake emptying into the North Atlantic?