Quote:


and if the ice had been made of carbon dioxide, they wouldn't have vaporized.



That's not right: it's too warm for solid CO2 at that site right now. The statement would be true in winter but it's summer there.

I'm still a little cautious. Mars is very different from Earth chemically and a lot of minerals that wouldn't be stable at all on Earth might well form pebbles on Mars that become unstable when exposed to the Martian surface. There needs to be a stronger reason to says it's H2O than just the fact that it can't be pure CO2...
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"If they can't picture me with a knife, forcing them to strip in an alley, I don't want any part of it. It's humiliating." - windsock