Sigh...
Don't you newbies EVER read the previous posts?
We've already done this one to death:-
If the spheres rained down after an impact event, they would be concentrated in layers in the rock.
They aren't.
Now go and read the last 3-months postings, get a fast-track education in observational science on Mars, and then come back and ask any REAL questions you've got.
Hint - Keyword "tectites"