File:Old Faithful Geyser eruption (5-10-5-14 PM, 12 November 2023) 2 - 53328434289.jpg

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English: (Old Faithful web camera screen capture)

Geysers are hot springs that episodically erupt columns of water. They occur in few places on Earth. The highest concentration of geysers anywhere is in Yellowstone’s Upper Geyser Basin.

Old Faithful Geyser is the # 1 most famous geyser on Earth. Its eruption frequency ranges from about a half-hour to about two hours - most are between 1.5 and 2 hours apart. Full-force eruption columns range from about 100 feet to less than 200 feet tall, and last from over a minute to about 5 minutes long.

The rocks around the Old Faithful Vent are geyserite - this material is also called siliceous sinter. Geyserite is a friable to solid chemical sedimentary rock composed of opal (hydrous silica, a.k.a. opaline silica: SiO2·nH2O). It forms by precipitation of hydrous silica from hot spring water. Geyserite is the dominant material at & around Yellowstone hot springs and geysers (the Mammoth Hot Springs area is a major exception to this). The silica in the geyserite is ultimately derived from leaching of subsurface, late Cenozoic-aged rhyolitic rocks by hot and superheated groundwater. Rhyolite is an abundant rock at Yellowstone.
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Source https://www.flickr.com/photos/47445767@N05/53328434289/
Author James St. John

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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/53328434289. It was reviewed on 28 November 2023 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

28 November 2023

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current21:11, 28 November 2023Thumbnail for version as of 21:11, 28 November 20231,375 × 762 (530 KB)Ser Amantio di Nicolao (talk | contribs)Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/53328434289/ with UploadWizard

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