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. Volcanic ash, however, may affect regions thousands of kilometres from its source 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.
The images show the trajectories normally starting at 3 vertical levels above the volcano The forecast period covers up to 48 hours from the initial time of the gem global model run that is used. Volcanic ash is a mixture of unconsolidated particles or pieces of rocks, mineral crystals, and glass shards measuring less than 2 mm in size ejected during a volcanic eruption It forms part of the tephra or pyroclasts suspended by hot gases released during an eruption that form the eruption plume or column.
Most volcanic hazards affect only those regions within a few kilometres of a volcano
