- Black Pool
Black Pool is a
hot spring in the West Thumb Geyser Basin ofYellowstone National Park in theUnited States .The pool was cool enough up until 1991 for dark orange-brown
cyanobacteria to grow throughout the pool. When combined with the blue of the water, the pool appeared to be an exceptionally dark green to almost black, hence the name.An exchange of function took place in 1991, shifting thermal energy to Black Pool and nearby
Abyss Pool , causing them to heat up. Black Pool's temperature became hot enough to kill all the cyanobacteria in the pool, turning the pool a rich teal blue color. The pool also had frequent boiling eruptions onAugust 15 ,1991 , doming the water to 3 feet and causing heavy runoff. Black Pool remains extremely hot, and is now one of Yellowstone's most beautiful and intensely blue pools. The name of the pool remains "Black Pool."References
*cite web | date =
22 December 2004 | url = http://www.nps.gov/yell/tours/westthumb/blackpool.htm | title = Black Pool | work = West Thumb Geyser Basin Tour | publisher = National Park Service | accessdate = May 25 | accessyear = 2006
*Bryan, T. Scott (1995). The geysers of Yellowstone. Niwot, Colorado: University Press of Colorado. ISBN 0-87081-365-XExternal links
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