These three giant Martian volcanoes make up a mountain range called the Tharsis Montes. Named the Arsia Mons (left), Pavonis Mons, and Ascreus Mons, each one is nearly 10 miles high. Although they are quite a bit shorter than the nearby volcanic giant, Olympus Mons, their summits are at about the same elevation because they sit on a greatly uplifted chunk of the Martian crust. Photo: NASA
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