7 Ways Other Planets (and Moons) Have Earth Beat

Forget Everest and those volcanoes in Hawaii. Olympus Mons dominates the Martian landscape, standing tall at a whopping 15.5 miles. Everest, for comparison, is just 5.5 miles above sea level.

Olympus Mons grew to its Olympian proportions because the Martian surface, unlike the crust of the Earth, is largely immobile. While hot spots on the Earth can create a series of volcanoes as the Earth's crust moves over them (think Hawaii), the hot spot under Olympus Mons just kept erupting in the same place on the crust, building a massive mountain.

Source: http://www.popularmechanics.com/science/space/7-ways-other-planets-and-moons-have-earth-beat?src=rss

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