Which phenomenon results when high viscosity felsic lava blocks a volcano's vent?

💡 Explanation

Pyroclastic flows are created by vent blockage because pressure from built-up gases and magma causes explosive eruption, a process is called Vulcanian eruption; therefore, a pyroclastic flow erupts, rather than steady lava flow.

• Which mechanism causes distinct ridges known as 'arêtes' to form between adjacent glacial cirques in mountainous regions?
• Which effect primarily drives oxbow lake formation during highly variable discharge events?
• Which consequence frequently results when heavy tephra accumulates downwind?
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• Which localized upwelling increase accompanies faster gyre rotation?
• Which outcome occurs when differential weathering undermines coastal sea stacks?