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pyroclastic rock |
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pyroclastic rock [¦pī·rə¦klas·tik ′räk] (petrology) A rock that is composed of fragmented volcanic products ejected from volcanoes in explosive events. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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This interpretation assumes that pyroclastic eruptions cannot occur below the critical point of seawater (31. He had witnessed a pyroclastic surge--a volcanic explosion resulting in a downpour of rocks and ash. More dangerous than tephra are so-called pyroclastic flows, which roll down a volcano rather than towering above it (SN: 1/13/01, p. |
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