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| Description: (a) Winding canyons on Mars, such as the one in this Viking 1 orbiter image, appear to be formed by sustained water flow. This theory is supported by the terraces seen on the canyon walls in high-resolution Mars Orbiter images. Long periods of water flow require that the planet’s atmosphere was once thicker and its climate more Earthlike Picture Stats: Views: 621 Filesize: 267.75kB Height: 900 Width: 864 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=16083 |