This extinct volcano rises above the Martian surface to a height of about level. The diameter of the volcano at the base is 624 kilometers. At the top of the mountain is an impact crater measuring 85x60x3 kilometers. The volcano is extinct and currently shows no significant activity and the last eruption took place between 100 and 200 million years ago. The extraordinary size of Olympus Mons is probably because there are no moving tectonic plates on Mars, so the lava underneath it can continuously erupt to the surface, contributing to its growth.
