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There are several, but they are all extinct.

Mars has apparently cooled down to the point where the volcanoes stopped erupting billions of years ago.

However, with the thin air, there is nothing to wear the volcanoes down. Olympus Mons is the largest volcano (or mountain) by far in the Solar system, owing to Mars' lower gravity.

Some entire mountain ranges on Earth wouldn't even completely circle Olympus Mons, and the peaks would be 1/4 of the height.

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15y ago

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