Which volcanic phenomenon develops when viscous lava accumulates rapidly over a vent on steep terrain?

💡 Explanation

When viscous lava accumulates on steep terrain, gravitational instability causes repeated dome collapse with explosive eruption and flows generating pyroclastic flows because of rapid unloading. Therefore, pyroclastic flow generation results, rather than basalt flood extrusion, shield volcano, or lava tube formation, which require different lava compositions and flow rates.

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