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Black Pool, northern Lower Group, West Thumb Geyser Basin, Yellowstone Hotspot, northwestern Wyoming, USA in August 2011.
Black Pool is a very hot, moderately deep, irregularly-outlined, and intensely blue- to deep turquoise-colored. It was formerly a deep greenish-black color, from the presence of yellowish extremophile bacterial mats on the pool walls and floor. Subsequent natural heating of this feature has knocked out most of the bacterial mats. Abundant, suspended, <0.5µ-sized, colloidal silica particles are responsible for the blue coloration of the water.
In 1991 and 1992, Black Pool had atypical activity, coinciding with activity at nearby Abyss Pool. One explosive eruption here in August 1991 involved the forceful detachment and nearby deposition of geyserite clasts. Boiling water domes up to 3 feet high were present in the pool after that eruption, accompanied by significant overflow.
Small eruptions also occurred at Black Pool in 1992.
Violet wanted to go in the pool while I was still putting on sunblock. Luckily, we have plenty of friends who could watch her for a few minutes.
The pool and waterfall are in a karst sinkhole created by the partial collapse of a cave. Hamilton Pool is a Travis County Park and one of the many spectaular karst features found in the Hill Country of Texas.
I thought Sylvia had closed her eyes on the previous photo, so I took another. As it happens, the first one is better.
Icelandic Pool Party. Jump in, the water's warm! Geothermal boiling hot water runs into this pool and is balanced out by cold water from a nearby stream. This is the most magical pool I've ever swam in.
Painted for the 'Square Foot' group show at the AWOL Gallery in Toronto. Acrylic on canvas, 10-1/2" x 10-1/2".
The 12x6m pool with Roman steps,raised sun deck and shade when required. An ideal family friendly area.
Title: Alumni Hall Pool photograph
Date: unknown
Description: This photograph shows the swimming pool that used to be located in the basement of Alumni Hall. Several young men are swimming. This picture would have been taken between 1907 and 1914.
Image ID: 4-8-Alumni Hall pool
This work has been identified as being free of known restrictions under U.S. copyright law, including all related and neighboring rights. The organization that has made this item available believes that the item is in the Public Domain under the laws of the United States, but a determination was not made as to its copyright status under the copyright laws of other countries. (CC Public Domain 1.0 and RightsStatements.org NoC-US 1.0). The original object is available at the Iowa State University Library Special Collections and University Archives (archives@iastate.edu). To request higher resolution reproductions of the original visit our website.