Although Pluto's durable H2O ice is probably not active on its own, it appears to be sculpted in a variety of ways through the action of volatile ices of N2 and CO.. (science.sciencemag.org)
«My gut feeling is that we will excavate a crater, get down to where there is a lot more volatile ice than near the surface, and create a new active area that will persist for months,» he says. (discovermagazine.com)
«The movement of volatile ices across [Pluto's] surface is continually resurfacing the planet and controlling its orientation — past, present and future. (scientificamerican.com)