Which outcome occurs when the viscosity of rhyolitic lava decreases within a stratovolcano during a fissure eruption under increasing hydrothermal pressure?

💡 Explanation

Higher hydrothermal pressure combined with decreased rhyolitic lava viscosity promotes the disintegration and explosive release of gases in magma; therefore, pyroclastic density currents escalate, rather than generating stable lava flows due to reduced resistance to expansion.

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