Brown muddy geothermal water bubbling at earth’s surface at Yellowstone National Park

mud geological sulfur rocks hydrothermal geothermal slow motion explode bedrock geology thermophile muddy geyser gas earth dirty natural hot spring national park heat dirty water yellowstone brown hot spring old faithful explore muddy water boiling outdoors splash wet outside hot water bubbling steam thermal natural temperature gasses science water microbes habitat nature convection experiment science class pools learn bubbles hot tub