Public domain
The Coming and Going of Ice
From the collection of NASA Image and Video Library. Free to download, adapt and use — no permission needed.
About this work
Like Earth's water table, Mars has an ice table. Sometimes, the ice table coincides with the ground's surface as it does here. The knobby, pitted terrain is caused when ice is deposited and then sublimates over and over again. This geologic process is called "accrescence" and "decrescence" and also occurs on Neptune's moon Triton and on Pluto, though in the outer Solar System the ice is not water ice.
NASA Image and Video Library’s own descriptionCredit lineThe Coming and Going of Ice. NASA/JPL, 2015-12-10. Public domain. ID: PIA20208.
