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 horizon's increased clay content results from eluviation within soil pedogenesis?
• Which mechanism causes crustal deformation near a transform fault boundary?
• Which risk increases when basaltic lava flows rapidly onto glacial ice?
• Which risk to alpine glaciers increases when volcanic ash accumulates?
• Which outcome occurs when vegetation anchoring coastal dunes dies?
• Which risk increases when an alluvial river's sediment load is drastically reduced by upstream dam construction?