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In volcanology, ejecta consists of particles that came out of a volcanic vent, traveled though the air or under water, and fell back on the ground surface or on the ocean floor. Ejecta can consist of
- juvenile particles - (fragmented magma and free crystals)
- cognate or accessory particles - older volcanic rocks from the same volcano
- accidental particles - derived from the volcanic basement.
In planetary geology, ejecta can also refer to the debris that is ejected during the formation of an impact crater.
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