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What outcome increases when viscous magma plugs fractures?

A)Elevated pyroclastic flow occurrence area
B)Expanded hydrothermal vent formations
C)Accelerated shield volcano propagation
D)Reduced effusive fissure development rate

💡 Explanation

Elevated pyroclastic flow occurrence increases because dome instability caused by magma crystallization creates overpressure and thus, catastrophic collapse rather than slow, sustained outgassing; therefore pyroclastic flows result, creating area effects.

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