Pyroclastic Flow 12
Pyroclastic Flow 12 : Natural Disaster. Ground-hugging mixtures of hot, generally dry, pyroclastic debris and volcanic gases that sweep along the ground surface at extremely high velocities (< 250 km/h). A continuum exists between pyroclastic flow and pyroclastic surge, depending on the ratio of solid materials to gases. Because of its relatively high aggregate density, the movement of pyroclastic flows tends to be more controlled by topography, mostly restricted to valley floors
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