The Changing Climate of Mars
A story of changes in the climate of Mars is told by icy deposits. Remnants of a formerly extensive deposit composed of dry ice layered together with dust and water ice form what is known as the south polar residual cap.
This deposit is shrinking over time as the frozen carbon dioxide turns to vapor. Rounded valleys that give the deposit an appearance resembling Swiss cheese are enlarging over time, exposing an older surface below that is likely made up of water ice.
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NASA/JPL/University of Arizona
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