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NASA has published photographs of the formation of dark dusty clays that look like spiders on Mars
Images were obtained with the Mars Reconnaissance Orbiter probe.
Spiders appear each year on the South Pole. The radiant mounds, which have been called "areaniform terrain", are formed as a result of the heating of carbon dioxide: the pressure under the ice increases, and the gas by jets bursts. During this process, black dust penetrates the surface of the ice, which spreads under the influence of the wind ", – reads the site.
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