Cratered Terrain -- Earth and Mars
The heavily cratered terrain on Mars resembles the highlands of the Moon. The densely cratered southern hemisphere indicates an older age, possibly as old as 4 b.y. as compared to other regions, i.e., Valles Marineris, Olympus Mons, etc. The larger craters, > 20 km in diameter are shallower, with flatter floors and more limited rim deposits than similar sized lunar craters. The Earth has a younger surface than Mars, thanks to plate tectonics. Terrestrial impact craters (left), such as Gosses Bluff (central Australia) are more eroded than are the Martian counterparts.
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