Learn techniques for surviving a pyroclastic flow. David Henrie responds to viral clip of Raven-Symoné | Tomi Lahren is fearless Lindsay Clancy jurors speaking out could prompt defense plea deal Huge ...

A pyroclastic flow (also known as a pyroclastic density current or a pyroclastic cloud) is a fast-moving current of hot gas and volcanic matter (collectively known as tephra) that flows along the ...