[Answer] pyroclastic flow

Answer: the explusion of ash cinders bombs and gases during an elplosive volcanic
eruption
pyroclastic flow
A pyroclastic flow is a dense fast-moving flow of solidified lava pieces volcanic ash and hot gases. It occurs as part of certain volcanic eruptions. A pyroclastic flow is extremely hot burning anything in its path. It may move at speeds as high as 200 m/s. Pyroclastic flows form in various ways.
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 ground away from a volcano at average speeds of 100 km/h (62 mph) but is capable of reaching speeds up to 700 km/h (430 mph).
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Pyroclastic flows contain a high-density mix of hot lava blocks pumice ash and volcanic gas. They move at very high speed down volcanic slopes typically following valleys. Most pyroclastic flows consist of two parts: a lower (basal) flow of coarse fragments that moves along the ground and a turbulent cloud of ash that rises above the basal flow.
A pyroclastic flow is a hot (typically >800 °C or >1 500 °F ) chaotic mixture of rock fragments gas and ash that travels rapidly (tens of meters per second) away from a volcanic vent or collapsing flow front.Pyroclastic flows can be extremely destructive and deadly because of their high temperature and mobility.
Pyroclastic flows are volcanic phenomena that involve high-density mixtures of hot fragmented soli…

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