artful driftwood laying on the bacterial mats of silex spring in yellowstone national park

active artful bacterial basin boiling caldera crater destination driftwood ecology environment excelsior fountain fumes geologic geology geothermal geyser heat hot its jelly landmark landscape laying lower mats mineral mount national natural nature outdoors outside paint park pool pot rock scenic silex sky spouting spring states steam steaming sulfur thermal trail travel united usa vacation vapor volcanic volcano water wild wilderness wyoming yellow yellowstone