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Chasma Boreale, Mars
Posted on Sunday, May 22, 2011
Uploaded by
Waspie_Dwarf
Image credit: NASA/JPL-Caltech/ASU
Uploader comment: Chasma Boreale, a long, flat-floored valley, cuts deep into Mars' north polar icecap. Its walls rise about 4,600 feet, or 1,400 meters, above the floor.
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