What is pyroclastic flow?

What is pyroclastic flow?
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A pyroclatic flow is a superheated flow of hot air, debris, ash. boulders and toxic gases. The Pyroclastis flow comes pouring down the volcanoe at 140-150 MPH the temperature can be around 1000 degrees Celsius. Best hope you're not around when one of these go off. Also never get by the lava after it has been erupted!!!!!!!
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