Exploratour - The Surface of Mars
Craters
In spite of the presence of volcanoes and river-like channels, the surface of Mars has many craters and resembles the lunar surface more than the terrestrial surface.
This is an example of the cratered terrain of Mars. Almost the entire surface of Mars is cratered to various degrees. The Tharsis Ridge, where many of the volcanoes of Mars are located, is lightly cratered. The lowlands of Mars are moderately cratered and so have not really been resurfaced, but the highlands of Mars, in the southern hemisphere, are heavily cratered, as shown in this image, which means that the southern hemisphere is a very old portion of Mars.
This cratering pattern provides evidence for the possibility of continental drift early in the history of Mars.