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Key Facts In This Video
Olympus Mons is more than twice the size of Mt. Everest and five times as high as Earth's tallest volcano, Mauna Loa. 00:47
Volcanoes on Mars remained active 1,000 times longer than Earth's volcanoes. 01:48
Mars has a thicker crust and weaker gravity than Earth, allowing mountains and volcanoes to grow much larger without collapsing. 02:54