[Nathan Zachary]

It also doesn’t make sense that frozen water would ‘evaporate’ so fast when it’s what -100c on mars? Now if it were a chunk of frozen co2...

[Smokin' Joe]

Sublimation depends on atmospheric pressure, too, which would be much lower there on Mars.

I was amazed in Grand Forks, ND in 1979 to see how much ice evaporated even though the mercury stayed below zero for a month, and that was with a normal Earth atmospheric pressure.