steam and water percolating from the grotto geyser in the upper geyser basin in yellowstone national park

basin boiling caldera cloud cone continental crater destination divide ecology environment erupting eruption faithful fumes geologic geology geothermal geyser grotto heat hot landmark landscape mineral mound national natural nature old outdoors park percolating rock scenic sky spouting spring states steam steaming thermal trail travel united upper usa vacation vapor volcanic volcano water wild wilderness wyoming yellowstone