Towering Volcanoes -- Earth and Mars

The Island of Hawaii is often used as an analogue to Olympus Mons as both are large shield volcanoes. Scale is where the similarity ends. If the subsea volcanic edifice is considered as well as that above sea level, the elevation of Hawaii is 9 km. Olympus Mons is the highest volcano in the Solar System at 27 km above the surrounding plains, making it 3 times higher than Mount Everest.

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