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The tallest volcanoes on earth existed millions of years ago, and may have towered many kilometers above their base level.

Existing volcanoes have reached heights of over 4000 meters (13000 feet) above sea level. The tallest volcano, Mauna Kea, has its base on the ocean floor and is over 10000 meters (33000 feet) in total height.

(Olympus Mons, on Mars, is more than 22 km tall, or over 14 miles.)

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11y ago

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