A pyroclastic flow is a fast-moving current of hot gas and volcanic matter, also known as tephra, that moves away from a volcano about 100 km/h (62 mph) on average but is capable of reaching speeds up to 700 km/h (430 mph).
Deadly!
A pyroclastic flow is a fast-moving current of hot gas and volcanic matter, also known as tephra, that moves away from a volcano about 100 km/h (62 mph) on average but is capable of reaching speeds up to 700 km/h (430 mph).
Deadly!