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Like some terrifying land version of a tidal wave, pyroclastic flows happen when an ash cloud collapses and in a glowing avalanche sweeps down the volcano slopes, causing damage not just by burial and incineration but also by impact damage and asphyxiation.
A glowing avalanche of hot volcanic ash cascades down Dante's Peak into the lake below.
In a Pelean eruption, glowing avalanches made of dense, hot gases are present along with the large amount of gas from the magma that causes pyroclastic materials.