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← GeographyWhich outcome occurs when stratovolcano magma traps gases?
A)Explosive pyroclastic eruption occurs subsequently✓
B)Effusive lava flows are sustained
C)Lahar formation rates gradually decrease
D)Deep groundwater upwelling cools the flow
💡 Explanation
An explosive pyroclastic eruption occurs because gas pressure overcomes magma's tensile strength, causing violent Vesiculation. This fragmentation of magma creates pyroclastic flows. Therefore, choice A result's, rather than effusive eruptions, where gases escape passively.
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