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Geography

Which risk increases during volcanic eruptions featuring Plinian columns?

A)Lateral blast overpressure radius swells
B)Lahars bury proximal stream valleys
C)Tephra dispersal impacts large areas
D)Fumarole activity triggers slope collapses

💡 Explanation

Widespread tephra dispersal increases because Plinian eruptions involve high-altitude explosive ejection of pyroclastic material undergoing atmospheric transport via advection; therefore tephra impacts vast regions, rather than localized blasts near the vent.

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