regarding supercooled liquid water, or possibly some other aqueous solution.
About those fogs: there's an intriguing phenomenon in many MOC pictures -- what looks like fogs clinging to the slopes of hills, cliffs, mesas and so on. I don't know that it has been reported on in the literature, or even if what I think I see is really what it is, Mars being the planet of ultimate mimicry and all, where almost nothing is what it seems to be.
Here's one example, it's in Nilosyrtis:
Also here: http://ida.wr.usgs.gov/html/e01017/e0101704.html
I'm interpreting the unusually smooth slopes as being fog-obscured. This is a very, very common phenomenon on Mars which suggests to me that vapor condenses on these slopes when they reach a certain temperature.
Note also the apparent flowfront, much like a glacier or a pyro or cryoclastic flow. Interesting...
Cheers, BRFelix
Space/Science » in reply to Supercooled liquid water can also occur in clouds below 0 degrees C.
re: True enough