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| Description: (a) This Mars Global Surveyor image of a portion of Valles Marineris reveals terrain with “stair-step layers.” Such terrain is likely to have been created by sedimentation at the bottom of an ancient body of water Picture Stats: Views: 713 Filesize: 341.77kB Height: 900 Width: 1074 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=16086 |