Difference between revisions of "Pumice"
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(New page: *A light-colored, frothy volcanic rock, usually of dacite or rhyolite composition, formed by the expansion of gas in erupting lava. Commonly perceived as lumps or fragments of pea size and...) |
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| − | + | A light-colored, frothy volcanic rock, usually of [[dacite]] or [[rhyolite]] composition, formed by the expansion of gas in erupting [[lava]]. Commonly perceived as lumps or fragments of pea size and larger but can also occur abundantly as ash-size particles.<ref>[http://vulcan.wr.usgs.gov/Glossary/volcano_terminology.html Glossary of Volcano and Related Terminology (Foxworthy and Hill, 1982)]</ref> | |
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| + | Because of its numerous gas bubbles, pumice commonly floats on water. <ref>[http://vulcan.wr.usgs.gov/Glossary/volcano_terminology.html Glossary of Volcano and Related Terminology]</ref> | ||
==References== | ==References== | ||
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Revision as of 06:00, July 10, 2007
A light-colored, frothy volcanic rock, usually of dacite or rhyolite composition, formed by the expansion of gas in erupting lava. Commonly perceived as lumps or fragments of pea size and larger but can also occur abundantly as ash-size particles.[1]
Because of its numerous gas bubbles, pumice commonly floats on water. [2]