GEOLOGY

Detailed explanation-1: -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.

Detailed explanation-2: -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.

Detailed explanation-3: -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-4: -Pumice, scoria, and cinders are specific types of highly vesicular pyroclastic rocks, although the distinction between them is somewhat arbitrary. Vesicles are small cavities in volcanic rocks that formed as bubbles that grew because of the exsolution of gases escaping from the magma upon eruption.

Detailed explanation-5: -Composite volcanoes, sometimes known as strato volcanoes, are steep sided cones formed from layers of ash and [lava] flows. The eruptions from these volcanoes may be a pyroclastic flow rather than a flow of lava. A pyroclastic flow is a superheated mixture of hot steam, ash, rock and dust.