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Which planet has the biggest known volcano in the Solar System?
SpaceGeology
Quick Answer
Mars has the biggest volcano, Olympus Mons, which rises about 22 km above the surrounding plains. It is roughly three times the height of Mount Everest above sea level.
The Full Story
Olympus Mons on Mars is the largest volcano known in the Solar System. It stands about 22 kilometres high and spans roughly 600 kilometres across, making it both towering and extremely wide. The volcano is a shield volcano built by repeated eruptions over a huge span of time. Mars's low gravity likely helped it grow so large without collapsing under its own weight.
Key Facts
1.Olympus Mons height: about 22 km
2.Width: about 600 km
3.Located on Mars
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"Mars has a volcano so huge it dwarfs Earth’s tallest mountain."