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True, if it has a long way to go, then it can not move as fast.
As fast as it can move, different people can move the arms slowly or fast.
Blocks are the most dangerous pyroclastic material.
What makes it so dangerous is, it can be hotter than 800 degrees Celsius (1500 degrees Fahrenheit). It can flow downhill faster than 160 kilometers per hour (100 mi/h).
Like most animals, a stingray can move either way. It will move slowly when it is feeding or just swimming around, and it will move fast if it is in danger.
Pyroclastic flow can travel at speeds as great as 450 MPH (700 KM/h)
No. A pyroclastic flow can move at well over 100 mph.
Tephra flow is fragments of volcanic rock and lava. Pyroclastic flow is fast moving current of hot gas and rock.
An explosive volcanic eruption. Pyroclastic flow is a mixture of fast flowing hot gases that travel down and away from the eruption.
161 km
Pyroclastic flows are fluidized masses of rock fragments and gases that move rapidly in response to gravity.
Very quickly. A pyroclastic flow can approach half the speed of sound. People exposed to the temperatures inside a pyroclastic flow can die almost instantly.
Pyroclastic flow.
Beware the pyroclastic flow!
Pyroclastic flow
The most dangerous thing an erupting volcano can produce is a pyroclastic flow. A pyroclastic flow produces hot ash and gas that is 1000 degrees Celsius in temperature. This toxic cloud can move as fast as 500 miles per hour.
Pyroclastic Flow