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pyroclastic flow noun

  /ˈpaɪ.ɹoʊ.klæ.stɪk floʊ/ , /ˈpaɪ.ɹə.klæ.stɪk floʊ/ , /ˈpaɪ.ɹəʊ.klæ.stɪk fləʊ/
  • (volcanology) A dense flow of volcanic ash, dust, rocks and debris that cascades at high speed down the slope of a volcano during an eruption.
 pyroklastiskt flöde
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