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← GeographyWhich 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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