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← GeographyWhich consequence results after a viscous lava develops plugs, which increase pressures within the volcanic conduit during dome-building eruptions?
A)Depletion of volatiles by diffusion
B)Over-pressurization causing pyroclastic flows✓
C)Increase in the lava density
D)Crystallization decreasing overall strength
💡 Explanation
Because the plugs create a pressure increase surpassing the rock strength, a Plinian eruption occurs causing pyroclastic flows; therefore, pyroclastic flow happens rather than standard lava flows, as pressure release is contained.
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