GEOLOGY

Detailed explanation-1: -Pyroclastic flows are products of explosive eruptions and consist of particles of hot molten rock and gases which move rapidly over the ground surface. Large-scale collapses of volcanic domes can also produce pyroclastic flows.

Detailed explanation-2: -Pyroclastic flows are the most deadly of all volcanic hazards and are produced as a result of certain explosive eruptions; they normally touch the ground and hurtle downhill, or spread laterally under gravity.

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.

Detailed explanation-5: -Pyroclastic flows have their origin in explosive volcanic eruptions, when a violent expansion of gas shreds escaping magma into small particles, creating what are known as pyroclastic fragments.