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Impacts Mitigation - Volcanic Ash - USGS Volcanic ash is formed during explosive volcanic eruptions Explosive eruptions occur when gases dissolved in molten rock (magma) expand as the magma rises, and then escape violently into the air, or when water is heated by magma and abruptly flashes into steam
Volcanic ash - Wikipedia Volcanic ash consists of fragments of rock, mineral crystals, and volcanic glass, produced during volcanic eruptions and measuring less than 2 mm (0 079 inches) in diameter [1]
Volcanic Ash - National Geographic Society 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
Ashfall is the most widespread and frequent volcanic hazard The smallest material, volcanic ash (<2 mm diameter) is both easily convected upward within the plume and carried downwind for very long distances; as it falls out of suspension it can potentially affect communities and farmland across hundreds, or even thousands, of square kilometers (miles)