Volcanic ash

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Ashsem small — Particle of volcanic ash from Mount St. Helens

español: Ceniza volcánica

English: Volcanic ash consists of small tephra, which are bits of pulverized rock and glass created by volcanic eruptions,^[1] less than 2 millimetres (0,079 in) in diameter. There are three mechanisms of volcanic ash formation: gas release under decompression causing magmatic eruptions; thermal contraction from chilling on contact with water causing phreatomagmatic eruptions and ejection of entrained particles during steam eruptions causing phreatic eruptions^[2].

Referencias[]

↑ United States Geological Survey. Tephra: Volcanic Rock and Glass Fragments. Retrieved on 2008-01-23.
↑ Heiken, G. & Wohletz, K. 1985. Volcanic Ash. University of California Press, Berkeley.

[TEPHRA-1] United States Geological Survey. Tephra: Volcanic Rock and Glass Fragments. Retrieved on 2008-01-23.

[heiken-2] Heiken, G. & Wohletz, K. 1985. Volcanic Ash. University of California Press, Berkeley.

[1]

[2]