Informational website about noaa's volcanic ash advisory centers and their monitoring of volcanic ash across significant parts of the world. Volcanic ash is formed during explosive volcanic eruptions when gases dissolved in magma (molten rock) expand and escape violently into the air, or when water is heated by magma and abruptly flashes into steam 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.
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Volcanic ash is a mixture of rock, mineral, and glass particles expelled from a volcano during a volcanic eruption
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. Current volcanic ash advisories advisories last updated Tue nov 18 08:19:16 utc 2025 advisories from the past 24 hours fuego guatemala sangay ecuador reventador ecuador fuego guatemala sangay ecuador reventador ecuador fuego guatemala sangay ecuador reventador ecuador fuego guatemala sangay ecuador reventador ecuador A volcano on japan’s major western island of kyushu had multiple eruptions on sunday, sending a plume of ash almost three miles into the air.
