NASA's Mars Global Surveyor shows small valleys in the martian cratered highlands are often quite old and have been modified by erosion and wind action. The valleys shown here are located on a crater rim in Terra Tyrrhena.

Small valleys in the martian cratered highlands are often quite old and have been modified by erosion and wind action. The valleys shown here are located on a crater rim in Terra Tyrrhena. MOC took this picture in April 1999.

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