Volcanic Ash
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Volcanic Ash

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High Quality Content by WIKIPEDIA articles! Volcanic ash consists of small tephra, which are bits of pulverized rock and glass created by volcanic eruptions,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. The violent nature of volcanic eruptions involving steam results in the magma and solid rock surrounding...