late spring in yellowstone national park: black growler steam vent with the scummy pool in the foreground in the porcelain basin a

area background basin black boiling environment feature foreground forest fumarole geothermal geyser growler heat hillside hot hydrothermal landscape late national natural nature norris nps outdoor outdoors park pool porcelain rock scenic scummy sky spring springtime steam sulfur thermal tourism travel trees vapor vent view volcano water wyoming yellowstone