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Which failure results when hydrothermal pressure exceeds dome strength?

A)Phreatic eruption occurs explosively
B)Effusive lava flow progresses gradually
C)Lahar formation mobilizes viscous lava
D)Localized caldera collapse intensifies quickly

💡 Explanation

A phreatic eruption occurs explosively near lava domes when increasing hydrothermal pressure causes steam explosion, surpassing the dome's structural integrity; therefore, it leads to violent ejection rather than lava flow, because lahar events and caldera collapses involve other, distinct mechanisms.

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