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December 2, 2008
it is suggested that this unusual terrain on Mars signifies huge glaciers of buried ice.--These floors of several mid-latitude crater in Hellas Basin on Mars, which appear unusually grooved, flat, and shallow, may indicate the largest volume of water ice outside of the Martian poles.
How the glacier on Mars originally formed remains a mystery. The rocky debris blanket topping the glaciers apparently has protected the ice from vaporizing, which would happen if it were exposed to the atmosphere at these latitudes.
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