GEOLOGY

Detailed explanation-1: -For example: Ash tuff-rock dominated by ash; sometimes simply referred to as tuff. Lapilli tuff-rock dominated by lapilli. Tuff breccia-rock containing 25% to 75% blocks and/or bombs.

Detailed explanation-2: -Pyroclasts may also include individual crystals, crystal fragments, and fragments of volcanic glass. Cinders, ash, and volcanic bombs are all pyroclasts.

Detailed explanation-3: -A rock with a pyroclastic texture is termed a tuff if the largest fragments are less than 2.5 inches long, a volcanic breccia if the fragments are larger. Because tuffs and breccias require lots of ash to form, most tuffs and breccias are intermediate or felsic in composition.

Detailed explanation-4: -Pyroclastic flows contain a high-density mix of hot lava blocks, pumice, ash and volcanic gas.

Detailed explanation-5: -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.