See what I mean? Hard to get info. Its one of those moons that has FROZEN ammonia and carbon dioxide on it. Almost everything I can find involves atmosphere. Its frustrating to no end!
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You are likely thinking of Titan. To quote Wikipedia:
quote:Titan's watery magma would be denser than its solid icy crust. This means that cryovolcanism on Titan would require a large amount of additional energy to operate, possibly via tidal flexing from nearby Saturn. Alternatively, the pressure necessary to drive the cryovolcanoes may be caused by ice Ih "underplating" Titan's outer shell. The low-pressure ice, overlaying a liquid layer of ammonium sulfate, ascends buoyantly, and the unstable system can produce dramatic plume events. Titan is resurfaced through the process by grain-sized ice and ammonium sulfate ash, which helps produce a wind-shaped landscape and sand dune features.
Except the ammonia is liquid, and it sounds like whatever makes it to the surface reacts with sulfuric acid and becomes ammonium sulfate (which is a solid, not a liquid, and therefore not ice). Finding pure frozen ammonia on the surface of Titan sounds about as natural as finding pure iron on the surface of Earth.
Plus, Titan is such a weird duck that the flavor of shaved ice on its beaches probably wouldn't make the postcard.