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October 6, 2008
An image from Astronomy picture of the day--- formation of layers of red cliffs in the north polar region of Mars:
Mars, Layers of Red Cliffs, NASA's Mars Reconnaissance Orbiter
Many troughs and scarps cut through the deposits of dusty ice up to 3 kilometers (2 miles) thick. One of these scarp faces is shown here; it is situated at the head of a large canyon (named Chasma Boreale) that cuts through these polar layered deposits.
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