Which outcome arises when viscosity limits lava dome collapse?

💡 Explanation

Explosive pyroclastic flows occur because highly viscous lava restricts gas escape, the 'mechanism' being pressure build-up exceeding structural capacity. Therefore, explosive eruptions occur rather than effusive flows, because viscosity controls degassing, not vent-clearing eruptions.

• Which outcome regarding lahars arises when intense rainfall saturates volcanic ash deposits on steep slopes?
• Which risk increases when the orographic effect intensifies wind flow?
• Which crustal outcome is caused by isostatic rebound following subduction?
• Which outcome accelerates cliff retreat weathering when wave approach weakens the fault?
• Which outcome develops when intense tropical rainfall alters surface soil profiles?
• Which risk increases when vegetation diminishes along stream banks?