NASA scientists have created a map of Mars crustal magnetism using data collected by the Mars Global Surveyor spacecraft. This high resolution magnetic field map covers the entire surface of Mars and displays "magnetic stripes" similar to what are found in the Earth's ocean basins. These stripes and other features are interpreted by NASA scientists as being evidence that Mars has undergone plate tectonics.
http://geology.com/news/2005/11/mars-geology-and-plate-tectonics.html
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