This global image of Mars was made by piecing together about 1,000 images from the Viking orbiters. This view encompasses the north polar cap (top), the Valles Marineris (lower center), and the Tharsis volcanic region (left). This image and the lead figure in each chapter have been selected to illustrate the geological diversity of the martian environment. Image courtesy of NASA/JPL and the U.S. Geological Survey.

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