Which outcome occurs when volatiles rapidly exsolve during magma ascent?

💡 Explanation

Pyroclastic flows occur because rapid volatile exsolution increases gas pressure exceeding magma strength; therefore a sustained eruption generating heated ash flows develops, rather than lava domes or structures. Pillow basalt forms through cooling, not exsolution.

• Which risk increases when pyroclastic flow encounters meltwater?
• Which atmospheric outcome is directly caused by the descending air within Hadley cells?
• Which mechanism causes the formation of placer deposits within an alluvial fan environment?
• Near river floodplains, which process results in loess accumulation?
• Which slope failure risk increases when thawing temperatures initiate solifluction?
• Which outcome is MOST LIKELY when heavy rainfall exceeds natural levee infiltration capacity along a major river?