GEOLOGY

Detailed explanation-1: -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.

Detailed explanation-2: -Pyroclastic particles (pyroclasts) form by disintegration of magma, as gases are released by decompression and then ejected from a volcanic vent either in air or beneath water. Hydroclasts form by steam explosions from magma-water interactions.

Detailed explanation-3: -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-4: -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.

Detailed explanation-5: -Pyroclastic fragments, also known as pyroclasts (Schmid, 1981), are produced by many processes connected with volcanic eruptions. They are particles expelled through volcanic vents without reference to the causes of eruption or origin of the particles.