7 dormant volcanoes you may not know about

Beautiful on the outside, these sleeping giants may one day awaken with destructive power.

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Mauna Kea, Hawaii

Mauna Kea, the highest point in the state of Hawaii, is also one of the world's tallest mountains – with an estimated base-to-peak height of 30,610 feet.

Despite its last eruption happening more than 4,600 years ago, Mauna Kea is expected to erupt again in the future. Because it's a more mature volcano (with estimates of age around 1 million years), such eruptions would likely feature slow lava flows, and not the explosive fury of its younger counterparts.

Thanks to its high altitude, dry environment and stable airflow, Mauna Kea is home to more than 13 telescopes funded by 11 countries.

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