Revision as of 12:30, 26 June 2019 by NRJC(talk | contribs)(Created page with "==Key Stage 4== ===Meaning=== A '''pyroclastic flow''' is a fast moving stream of hot ash, gases and steam from a volcano usually caused by an explosion of the v...")
A pyroclastic flow is a fast moving stream of hot ash, gases and steam from a volcano usually caused by an explosion of the volcano due to the pressure of magma underground.