Photograph Description
Group of Martian volcanic rocks known as Toltecs. These rocks are typical of those in the area and they will be used as a basis of comparison for other rocks, such as the Clovis outcrop, which it is believed may have been chemically altered by water. Image taken in Gusev Crater by NASA’s Mars Exploration Rover Spirit on 15 August 2004. (Photo by Science Photo Library)
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