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SlideshowReport

Changing Seasons on Mars

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
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