Hawaii's famous Hōlei Sea Arch has sadly collapsed. This did not occur through human activity, but rather this volcanic pillar of basaltic rock collapsed due to long term wave erosion. Today's video will discuss why the arch collapsed, the changing shape of the Hawaiian Islands, and when precisely it originally formed. Thumbnail Photo Credit: S. Geiger, Posted on U.S. Geological Survey Website, Public Domain, https://www.usgs.gov/media/images/holei-arch. This image was overlaid with text, and then overlaid with GeologyHub made graphics. Only the background source image, and not the text or overlays fall under the public domain. 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] National Park Service [4] Arches National Park [5] Hawaiʻi Volcanoes National Park 0:00 Hawaii's Sea Arch Collapsed 0:29 2025 Observations 1:27 Erosion 2:50 Kāne Nui o Hamo Link