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← GeographyWhich 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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