Outlet of the Excelsior Geyser in Firehole River, Midway Geyser Basin, colourful thermophilic bacteria, microorganisms, geysers, hot springs, Yellowstone National Park, Wyoming, United States of America, USA

america american area areas bacteria bacteria bacterium basin colourful conservation day daylight daytime during energy excelsior exterior exteriors firehole geologic geological geologically geology geothermal geothermic germs geyser geyser geysers hot hot spring hot springs in microorganisms midway national national natural nature nobody north of outdoor outlet park park parks photo photos power preserve preserves reserve reserves river sanctuaries sanctuary shot shots source sources spring springs states the thermal thermophilic united us us american usa well wells wildlife wyoming yellowstone