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ejecta : ウィキペディア英語版
ejecta

Ejecta (from the Latin: "things thrown", singular ejectum) refers to particles ejected from an area. In volcanology, in particular, the term refers to particles that came out of a volcanic vent, traveled through 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 rocks under the volcano
In planetary geology, this term includes the debris that is ejected during the formation of an impact crater, while in astrophysics, it refers to material expelled in a stellar explosion like in a supernova or in a coronal mass ejection.
==References==



抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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