The term is used for the material while it is in the air, after it falls to the ground, and sometimes after it has been lithified into rock. As it falls out of suspension it can potentially affect communities and farmland across hundreds, or even thousands, of square kilometers (miles). Volcanic ash is a mixture of rock, mineral, and glass particles expelled from a volcano during a volcanic eruption
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The particles are very small—less than two millimeters in diameter
They tend to be pitted and full of holes, which gives them a low density.
Informational website about noaa's volcanic ash advisory centers and their monitoring of volcanic ash across significant parts of the world. The smallest material, volcanic ash (<2 mm diameter) is both easily convected upward within the plume and carried downwind for very long distances