Black Opal Pool, Hot Spring, Yellow Algae and Mineral Deposits, Biscuit Basin, Yellowstone National Park, Wyoming, USA, North America

algae alga american america aquatic macrophyte aquatic plants aquatic plant biscuit basin black opal pool deserted empty famous place geothermal areas geothermal area geothermal field geothermal power geothermal spring geothermal geothermic energy geothermic high temperature area hot spring hot hydrophyte hydrophytic plant mineral deposits mineral deposit minerals mineral np national parks national park usa national park natural preserve nature conservation area nature reserves nature reserve nature nobody no one no people north america np place of interest plants plant rocks rock sedimentation sediments sediment sights sight source springs spring thermal area thermal springs thermal spring thermal zone tourist attractions tourist attraction turquoise blue turquoise green turquoise uninhabited united states of america united states us american us america usa water plant waters water wyoming yellowstone national park yellow