The reason that olympus mons, the tallest volcano on mars, is taller than mount everest (the tallest mountain on earth) is because of Mars' low gravity, slow-moving tectonic plates, and high volcanic activity.
Olympus mons is a shield volcano in the western hemisphere of Mars. At 72,000 feet high (2.5 times the height of Mount Everest) and 374 miles wide (roughly the size of Arizona), it is the largest volcano in the solar system. Mars' atmosphere is so thin that volcanic peaks actually protrude above it. Shield volcanoes, like Olympus Mons, form when lava slowly flows out of the ground and spreads out, creating a low, squat appearance. Shield volcanoes have an average slope of only 5%, and therefore the height of Olympus Mons is even more impressive.
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