yellowstone national park with colorful hot spring at west thumb geyser basin on yellowstone lake, wyoming, usa

algae america american background basin beautiful caldera clear color colorful colour colourful dot environment expanse faithful firehole forest frozen geological geology geothermal geyser geyserite glory green hike hiking hot lake landscape morning mountains national natural nature north old one outdoor outdoors park plateau pool pools river rocky runoff spring springs states still tectonics thumb trail trees turquois united upper usa volcanic volcanism water west western wild wilderness wyoming yellow yellowstone