Mauna Kea

Mauna Kea (/ˌmɔːnə ˈkeɪə, ˌmaʊnə -/, Hawaiian: [ˈmɐwnə ˈkɛjə]; abbreviation for Mauna a Wākea, 'White Mountain') is a dormant shield volcano on the island of Hawaiʻi. Its peak is 13,803 feet (4,207.3 meters) above sea level, making it the highest point in Hawaii and the island with the second highest high point, behind New Guinea. The peak is about 125 ft (38 m) higher than Mauna Loa, its more massive neighbor. Mauna Kea is unusually topographically prominent for its height: its prominence from sea level is 15th in the world among mountains, at 13,803 ft (4,207.3 m); its prominence from under the ocean is 30,610 ft (9,330 m), rivaled only by Mount Everest. This dry prominence is greater than Everest's height above sea level of 8,848.86 metres or 29,031.7 feet, and some authorities have labeled Mauna Kea the tallest mountain in the world, from its underwater base. Mauna Kea is ranked 8th by topographic isolation.

It is about one million years old and thus passed the most active shield stage of life hundreds of thousands of years ago. In its current post-shield state, its lava is more viscous, resulting in a steeper profile. Late volcanism has also given it a much rougher appearance than its neighboring volcanoes due to construction of cinder cones, decentralization of its rift zones, glaciation on its peak, and weathering by the prevailing trade winds. Mauna Kea last erupted 6,000 to 4,000 years ago and is now thought to be dormant.