GEOLOGY

Detailed explanation-1: -Explosive eruptions can form pyroclastic flows that sweep down valleys, destroying everything in their path. They also send ash high into the atmosphere, forming plumes.

Detailed explanation-2: -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.

Detailed explanation-3: -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.

Detailed explanation-4: -A pyroclastic flow typically occurs during a(n) QUIET eruption. A(n) DORMANT volcano is erupting or may erupt in the near future. Ash, cinders, and bombs build up in a steep pile to form CINDER CONE volcanoes. Lava that flows out of cracks and cools forming high layers is called a LAVA PLATEAU.