Volcanic ash

Volcanic ash, often referred to as volcanic sand or pyroclastic fall is a volcanic material falling into the air during an eruption, consisting of large to medium-sized rocks. Large rocks (pebbles) usually fall around the crater to a radius of 5 - 7 km from the crater, and the finer ones can fall at distances of hundreds of miles and even thousands of miles from the crater as they may be affected by wind gusts. Smooth ash can cause pneumonia if inhaled.

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