pyroclastic flow

Definitions

1. A dense flow of volcanic ash, dust, rocks and debris that cascades at high speed down the slope of a volcano during an eruption.
   countable
2. Used other than figuratively or idiomatically: see pyroclastic, flow: flow (uncountable) of pyroclastic particles.
   uncommon, uncountable

Equivalents

Examples

“Most of the material was erupted in the most dangerous way as ‘pyroclastic flows’: incredibly hot volcanic fragments all buoyed up with gas that can travel⟳ fasted than a speeding car in pulse after pulse.”

“Viscous debris flow⟳ is different not only from inertial debris flow⟳ but also from granular flow⟳, pyroclastic flow⟳ and snow⟳ avalanche, because the effect of inelastic collision of particles does not play⟳ an important role in viscous debris flow⟳.”

CEFR level