Mars north polar map. Geologic map of Mars viewed from above the northern polar ice cap. This map is based on surveys from the Viking orbiter spacecrafts. Black lines outline the shapes of craters, basins, ridges, faults and other notable landmarks. Colours depict rock type (lithology), rock layers (stratigraphy) and structure. The northern ice cap measures roughly 600 kilometres in diameter. This permanent feature is composed of water ice and frozen carbon dioxide.
September 25th, 2018
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