In the winter a layer of carbon dioxide ice dry ice covers the north polar sand dunes as shown by NASA Mars Reconnaissance Orbiter. In the spring the sublimation of the ice going directly from ice to gas causes a host of uniquely Martian phenomena.
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Details
Title: A Burst of Spring
Creator: NASA/JPL-Caltech/University of Arizona
Date Created: 2010-03-10
Rights: JPL
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