Ejecta

Ejecta (from the Latin: "things thrown out", singular ejectum) are 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:

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 as in a supernova or in a coronal mass ejection.

...
Wikipedia