Though the southern ice cap is colder than the northern one, the southern features form in Richardson crater, which is 17.4 degrees from the pole, and the features there form at much higher surface temperatures, which rule out dry ice.
Though the southern ice cap is colder than the northern one, the southern features form in Richardson crater, which is 17.4 degrees from the pole. The flow-like features in Richardson crater form at much higher surface temperatures, which rule out dry ice.