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Ejecta
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== Volcanology == Typically in [[volcanology]], ejecta is a result of [[explosive eruption]]s. In an explosive eruption, large amounts of [[volcanic gas|gas]] are dissolved in extremely [[viscous]] lava; this lava froths to the surface until the material is expelled rapidly due to the trapped pressure. Sometimes in such an event a lava plug or [[volcanic neck]] forms from lava that solidifies inside a volcano's vent, causing heat and pressure to build up to an extreme with no way to escape. When the blockage breaks and cannot sustain itself any longer, a more violent eruption occurs, which allows materials to be ejected out of the volcano.<ref>[http://www.landforms.eu/Lothian/volcanic%20neck.htm] {{Webarchive|url=https://web.archive.org/web/20180926124457/http://www.landforms.eu/Lothian/volcanic%20neck.htm|date=2018-09-26}}, Volcanic Neck, Volcanic Plug, USGS.</ref><ref>[http://chis.nrcan.gc.ca/volcano-volcan/hazard-risque-en.php?wbdisable=true], Ejecta, Natural Resources Canada.</ref> Ejecta can consist of: # juvenile particles β (fragmented [[magma]] and free [[crystal]]s) # cognate or accessory particles β older [[volcanic rock]]s from the same [[volcano]] # accidental particles β derived from the [[Rock (geology)|rocks]] under the volcano These particles may vary in size; [[tephra]] can range from ash (<{{convert|1//10|in|cm|disp=sqbr}}) or [[lapilli]] (little stones from {{convert|1//10|to|2+1/2|in|cm|disp=or}}) to [[volcanic bomb]]s (>{{convert|2.5|in|cm|disp=sqbr}}).<ref>[http://volcano.oregonstate.edu/glossary/1/letterl#term74] {{Webarchive|url=https://web.archive.org/web/20191129030928/http://volcano.oregonstate.edu/glossary/1/letterl#term74|date=2019-11-29}}, Oregon State University Glossary.</ref>
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