I would say . . .
...One thing I find interesting is the use of the tern "youthful."
Geologic activity on Pluto? Mind-boggling.
As for the ice, once a year, it seems Pluto might be warm enough to release an atmosphere from its frozen surface, which would keep it recycling, all nice and bright. Otherwise, the cosmic bombardment would darken a frozen, stagnant surface.
Cheers, all.