Yellowstone National Park, WY

vapor, streaming, storm, storm clouds, splashing, splash, spew, scenery, scene, scenic, overcast, moving, movement, move, motion, mood, moody, misty, mist, landscape, hole, grey, gray, fuming, fumes, fumarole, flowing, flow, emerging, emerge, deposits, deposit, crust, cloudy, bubbling, bubble, activity, action, Yellowstone National Park, WYOMING, wilderness, white, water, volcanic, venting, vent, USA, US, United States, U.S.A., U.S., twilight, tree, thermal, sunset, sun, steam, spurting, spurt, spray, spouting, spewing, sky, skies, pressure, outside, outdoors, NP, nature, natural, national park, N.P., Mustard Spring, mineral, hot spring, hot, heated, heat, geyser, geothermal, fluid, evening, eruption, erupting, environment, ecosystem, ecology, dusk, colour, color, clouds, Caldera, boiling, Biscuit Basin, American, America, active, A0710