GEOLOGY

Detailed explanation-1: -Pyroclastic rocks (derived from the Greek: , meaning fire; and , meaning broken) are clastic rocks composed of rock fragments produced and ejected by explosive volcanic eruptions. The individual rock fragments are known as pyroclasts.

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: -When magma is ejected by a volcano or other vent, the material is called lava. Magma that has cooled into a solid is called igneous rock.

Detailed explanation-4: -igneous rock Pyroclastic rocks are those formed from clastic (from the Greek word for broken) material ejected from volcanoes. Blocks are fragments broken from solid rock, while bombs are molten when ejected.

Detailed explanation-5: -Volcanic gases form a dissolved component of magma that is released to the atmosphere in large quantities during eruptions. The principal volcanic gases are water vapor, hydrogen sulfide, sulfur dioxide, carbon dioxide, carbon monoxide, hydrogen chloride and hydrogen fluoride.