Hawaii used to have an extensive glacier which covered an area of 27 square miles. This glacier existed for more than 90,000 years, albeit intermittently, on the summit of Mauna Kea. Today, abundant glacial deposits from this colder period of time can still be found on its upper flanks and summit area. Thumbnail Photo Credit: Google Earth, Data SIO, NOAA, U.S. Navy, GEBCO, Data LDEO-Columbia, NSF, NOAA, Data MBARI, Image © 2026 Airbus. This image was overlaid with text, and then overlaid with GeologyHub made graphics (the image border & the GeologyHub logo). If you would like to support this channel, consider using one of the following links: (Patreon: http://patreon.com/geologyhub) (YouTube membership: https://www.youtube.com/channel/UCYeGh5VML5XPr5jYnzh3J6g/join) (Gemstone & Mineral Etsy store: http://prospectingarizona.etsy.com) (GeologyHub Merch Etsy store: http://geologyhub.etsy.com) Google Earth imagery used in this video: ©Google & Data Providers This video is protected under "fair use". If you see an image and/or video which is your own in this video, and/or think my discussion of a scientific paper (and/or discussion/mentioning of the data/information within a scientific paper) does not fall under the fair use doctrine, and wish for it to be censored or removed, contact me by email at [email protected] and I will make the necessary changes. Various licenses used in sections of this video (not the entire video, this video as a whole does not completely fall under one of these licenses) and/or in this video's thumbnail image (and this list does not include every license used in this video and/or thumbnail image): Public Domain: https://creativecommons.org/publicdomain/mark/1.0/ Sources/Citations: [1] U.S. Geological Survey [2] Hawaiian Volcano Observatory [3] USGS Denver Library Photographic Collection 0:00 Glaciers 0:46 Mauna Kea's Glaciers 2:13 Subglacial Eruptions 3:34 Subsidence 4:27 Glacial Deposits Extent