Fast-moving current of hot gas and volcanic matter that moves away from a volcano.
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The most destructive result of a volcanic eruption is known as a pyroclastic flow or surge.
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In many ways, the disaster is reminiscent of Pompeii, where a similar pyroclastic flow from Mt.
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The billowing tidal wave of dust was rolling up the street toward him like a volcano's pyroclastic flow.
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Kizimen produced a large pyroclastic flow this week while the activity at Karymsky was confined to small ash plume.
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The column's collapse causes a pyroclastic flow: extreme heat of up to 700C that vaporises everything in its path.
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Eight people are dead in California, tens of thousands evacuated, smoke and pyroclastic clouds are visible from space.
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español
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