... Since this swiss-cheese topography is unique to the polar cap covering southern Mars , exogeologists speculate that mesa composition might be high in frozen carbon dioxide ( dry ice ). ...
... temperature differences between the receding polar ice and the warming regions to ... the left, north is up and the Martian polar cap is seen at the top with dark regions ...
... Explanation: The North Pole of Mars is capped by layers likely consisting of ice and dust deposited over millions of years. ... Dark areas bordering the polar cap are fields of sand dunes . ...
... The polar cap is clearly smaller than the storm just below it and farther left. ... this storm was marked by a system of swirling bright water-ice clouds instead of the billowing dust of a more typical martian ...
... recorded on successive mapping orbits at intervals of about 2 hours, with the white north polar cap near the center of each ... seem to mix the brownish dust clouds and white water-ice clouds as the curling storm front churns over the extreme northern ...