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pyroclastic

World Encyclopedia | 2005 | 242 words | Copyright

pyroclastic Fragment of rock thrown out by explosive volcanic activity. Pyroclasts normally include solidified lava left behind by a previous eruption of the volcano, as well as rocks from the crust, smaller pieces of cinders, ash, and dust.

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"pyroclastic." World Encyclopedia. 2005. Encyclopedia.com. 28 May. 2012 <http://www.encyclopedia.com>.

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