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Volcanic Eruptions: Structure, Causes, Process, Impacts & Recent Events (2025) What is a volcanic eruption? A volcanic eruption is the explosive or effusive release of magma, volcanic gases, ash, and rock from beneath the Earth’s crust when subterranean pressure becomes too great. How does an eruption start? It begins when magma forms in the mantle, rises through cracks due to buoyancy, accumulates gas, and ultimately breaks through to the surface via conduits and vents. What’s the difference between effusive and explosive eruptions? Effusive eruptions involve low-viscosity lava flowing steadily, while explosive eruptions eject ash, pyroclastic flows, and volcanic bombs due to high gas pressure and viscous magma. Which volcanic hazard is most dangerous? Pyroclastic flows are among the most dangerous because they travel at high speed, carry extreme heat, and can obliterate everything in their path. What Is a Volcano? A ...
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