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- Volcanic ash - Wikipedia
The types of minerals present in volcanic ash are dependent on the chemistry of the magma from which it erupted Considering that the most abundant elements found in silicate magma are silicon and oxygen, the various types of magma (and therefore ash) produced during volcanic eruptions are most commonly explained in terms of their silica content
- Volcanic Ash and Volcanic Dust | Photos, Satellite Images, More
Volcanic ash particles are very small in size and have a vesicular structure with numerous cavities This gives them a relatively low density for a rock material This low density, combined with the very small particle size, allows volcanic ash to be carried high into the atmosphere by an eruption and carried long distances by the wind
- Volcanic Ash - National Geographic Society
When an ash column is moved about by wind, it is called an ash plume Eventually the ash in the sky falls to the ground It may create a thick layer of dust-like material on surfaces for miles around the original eruption Unlike the ash produced by burning wood and other organic materials, volcanic ash can be dangerous
- Volcanic Ash, Tephra Fall, and Fallout Deposits
Volcanic ash is very abrasive due to the jagged edges of the ash particles, especially along vesicle (bubble) boundaries It can also be mildly corrosive Volcanic ash can be produced in any explosive eruption, but widespread ash-fall deposits are usually only associated with Sub-Plinian and Plinian eruptions that mostly occur at composite
- Ashfall is the most widespread and frequent volcanic hazard
Ash endangers aviation and infrastructure Ashfall rarely endangers human lives, but it can have devastating effects on the things that we rely upon from day to day As a result of its fine-grained abrasive character and widespread distribution by wind, ashfall and volcanic ash clouds are a major hazard to aviation
- What Is Volcanic Ash, Its Effects, and How to Mitigation Them
Volcanic ash cloud over Bergen, Norway, following the Eyjafjallajökull volcano eruption Photo credit: Stiaand, CC BY-SA 3 0, via Wikimedia Commons Particle size, column height, and weather conditions like the strength of wind and humidity will determine how far the ash disperses
- Impacts Mitigation - Volcanic Ash - USGS
Volcanic ash is not the product of combustion, like the soft fluffy material created by burning wood, leaves, or paper, but rather consists of fragments of rocks, minerals, and volcanic glass ranging in size from sand to clay-like (from 2 mm (1 12 in) to less than 0 004 mm (1 256th in) in diameter)
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