Mauna Kea, Hawaii

Mauna Kea
Maunakea
Mauna Kea in December 2007, with its seasonal snow cap visible
Highest point
Elevation	4,207.3 m (13,803 ft)
Prominence	4,207.2 m (13,803 ft)
Isolation	3,947 km (2,453 mi)
Listing	Highest ocean islands 2nd World most prominent 15th World most isolated peaks 8th Oceania highest peaks 2nd US highest major peaks 57th US most prominent peaks 2nd US most isolated peaks 2nd US state high point 6th Hawaii highest major peaks 1st
Coordinates	19°49′14″N 155°28′05″W / 19.820664075°N 155.468066397°W / 19.820664075; -155.468066397Coordinates: 19°49′14″N 155°28′05″W / 19.820664075°N 155.468066397°W / 19.820664075; -155.468066397
Geography
Mauna Kea Position of Mauna Kea in Hawaii
Location	Hawaii County, Hawaii, United States
Parent range	Hawaiian Islands
Geology
Age of rock	Oldest dated rock: 237,000 ± 31,000 BP Approximate: ~1 million
Mountain type	Shield volcano Hotspot volcano
Volcanic arc/belt	Hawaiian–Emperor seamount chain
Last eruption	2460 BC ± 100 years
Climbing
First ascent	Recorded: Goodrich (1823)
Easiest route	Mauna Kea Trail
U.S. National Natural Landmark
Designated	November 1972

Mauna Kea (/ˌmɔːnə ˈkeɪ.ən/ or /ˌmaʊnə ˈkeɪ.ə/, Hawaiian: [ˈmɐwnə ˈkɛjə]), is a dormant volcano on the island of Hawaii. Standing 4,207 m (13,802 ft) above sea level, its peak is the highest point in the state of Hawaii. Much of the mountain is under water; when measured from its oceanic base, Mauna Kea is over 10,000 m (33,000 ft) tall and is the tallest mountain on Earth. Mauna Kea is about a million years old, and has 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; contributing factors include the construction of cinder cones, the decentralization of its rift zones, the glaciation on its peak, and the weathering effects of the prevailing trade winds. Mauna Kea last erupted 6,000 to 4,000 years ago and is now considered dormant.