Which of these occurs due to explosive degassing from rhyolitic lava domes?

💡 Explanation

Pyroclastic surges quickly propagate outwards because expansion of trapped gases rapidly occurs during explosive volcanism within a viscous rhyolitic dome. Degassing causes surges, rather than shield collapses or floods; those involve different triggers, therefore A is correct.

• Which geomorphic outcome accelerates when thermokarst destabilizes Arctic hillslope permafrost?
• Which outcome occurs when fine loess sediment subsides?
• Which landform develops where acidic groundwater dissolution occurs?
• Which outcome affects cave stalactite formation when increased rainfall reduces water velocity?
• Which process explains pyroclastic flow formation during Plinian volcanic eruptions?
• Which erosional outcome characterizes fjord formation during glaciation?