yellowstone national park with morning glory pool at upper geyser basin, wyoming

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