Hi -
Yeah, blueberries where they are not supposed to be if they are water products.
Generally, molten impact rock and impactor will condense into a sphere, unless
deformed by atmospheric interaction, in which case you get a tektite.
As Mars' atmosphere is close to a vacuum, my guess is that there were no
convecting plumes on impacts, and what atmosphere there was nearby became a
vacuum.
But that is just a guess. Elton, you have any insights into Martian
hypervelocity impacts?
E.P. Grondine
Man and Impact in the Americas
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