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| Description: During the Martian winter, the temperature decreases so much that carbon dioxide freezes out of the Martian atmosphere. A thin coating of carbon dioxide frost covers a broad region around Mars’s north pole. During the summer in the northern hemisphere, the range of this north polar carbon dioxide cap decreases dramatically. During the summer, a ring of dark sand dunes is exposed around Mars’s north pole Picture Stats: Views: 654 Filesize: 118.13kB Height: 900 Width: 1341 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=16077 |