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← GeographyWhich risk increases when rhyolitic magma's volatile content rises?
A)Lower viscosity lava emplacement
B)Effusive lava flows diminish greatly
C)Increased frequency block lava flows
D)Pyroclastic flow eruption probability becomes high✓
💡 Explanation
Increased volatile content enhances magma fragmentation via Vesiculation, because expanding gas bubbles lead to explosive eruptions and pyroclastic flows; therefore, pyroclastic flow risk rises, rather than producing effusive lava flows, which need lower gas content.
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