The research described in this paper gives proof of the assumption, previously made by other researchers, that blocks of CO2 ice can play a role in the creation of dune gullies on Martian dunes.

"In spring, this ice begins to warm up and sublimate. The last remnants of this ice are located on the shaded side of the ...

Can you melt dry ice? At normal air pressure, solid CO2 skips the liquid phase and turns directly into a gas (sublimation).