10/02/2018 4:30:00 10/02/2018 4:30:00 Whatispedia

10/02/2018 4:30:00 Ash-flow tuff Ash-flow tuff

Ash-flow tuff

The deposit of a hot, chaotic mixture of pumice, ash, and gas (pyroclastic flow) that travels rapidly (as fast as tens of meters per second) away from a volcanic vent during an explosive eruption.