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Which outcome results when slow magma supply builds pressure inside a volcanic lava dome composed of andesite?

A)Sudden explosive pyroclastic density currents
B)Gradual increase in shield volcano size
C)Effusive quiet flow of basaltic lava
D)Steady emission of low-viscosity tephra

💡 Explanation

Sudden explosive pyroclastic density currents will occur because increasing internal pressure may exceed the dome's rock strength leading to catastrophic failure via the mechanism of gas expansion; therefore explosive eruption rather than effusive activity, or shield formation will happen.

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