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.

Detailed explanation-2: -There are two types of pyroclastic density currents: pyroclastic flows and pyroclastic surges. Pyroclastic flows are high-density currents of pumice, ash, blocks, and volcanic gas that rapidly move down the slopes of a volcano.

Detailed explanation-3: -This degassing magma is driven up into high eruption clouds and also hugs the ground as pyroclastic flows, clouds of magma droplets, ash clouds and gases. Gases from such eruptions can be deadly. They include water vapour, carbon dioxide, carbon monoxide, sulfur dioxide, hydrogen sulfide and hydrofluoric acid.

Detailed explanation-4: -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.