Volcanic ash

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Term volcanic ash
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Definition

Fine particles of mineral matter from a volcanic eruption which can be dispersed long distances by winds aloft.

Definition Source

UNITED STATES, National Oceanic and Atmospheric Administration's National Weather Service (NOAA) Glossary [1]

Note

The chemical composition and abrasiveness of the particles can seriously affect aircraft and also machinery on the ground. If it is blown into the stratosphere and it is thick enough, it can decrease the global temperature