Sunset Lake, geyser, drainage area, coloured thermophilic bacteria, microorganisms, Black Sand Basin, Upper Geyser Basin, Yellowstone National Park, Wyoming, United States of America, USA

america american area areas bacteria bacteria bacterium basin black bodies body coloured conservation countryside day daylight daytime drainage during energy exterior exteriors famous geologic geological geologically geology geothermal geothermic germs geyser geyser geysers hot hot spring hot springs known lake landscape landscapes microorganisms national national natural nature nobody north of outdoor park park parks photo photos power preserve preserves renowned reserve reserves sanctuaries sanctuary sand scenery scenic seeing shot shots sight sights source sources spring springs states steam steaming sunset the thermal thermophilic united upper us us american usa vapor vapour water waters well well known wells wildlife worth wyoming yellowstone