Answer: A Plinian eruption ejects a column of tephra high into the atmoshpere (tephra refers to any material that is ejected from a volcano into the atmosphere), creating a form similar to the mushroom cloud of a nuclear explosion. A Plinian eruption of Vesuvius began at midday on 24 August 79 AD created a Plinian column approximately 20 km (66,000 feet) high.
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