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Colourful volcanic landscape with hills and snow, volcanic hot springs, Laugavegur trekking trail, Landmannalaugar, Fjallabak Nature Reserve, Icelandic Highlands, Suðurland, Iceland, Europe

Colourful volcanic landscape with hills and snow, volcanic steaming hot springs, Laugavegur trekking trail, Landmannalaugar, Fjallabak Nature Reserve, Icelandic Highlands, Suðurland, Iceland, Europe

Colourful volcanic landscape with hills and snow, volcanic steaming hot springs, Laugavegur trekking trail, Landmannalaugar, Fjallabak Nature Reserve, Icelandic Highlands, Suðurland, Iceland, Europe

Colourful volcanic landscape with hills and snow, volcanic steaming hot springs, Laugavegur trekking trail, Landmannalaugar, Fjallabak Nature Reserve, Icelandic Highlands, Suðurland, Iceland, Europe

Mound and Jupiter Spring Terrace, Main Terrace, limestone sinter terraces, geysers, hot springs, Mammoth Hot Springs Terraces in Yellowstone National Park, Wyoming, United States of America, USA

Minerva Spring Terrace, Lower Terraces, limestone sinter terraces, geysers, hot springs, Mammoth Hot Springs Terraces in Yellowstone National Park, Wyoming, United States of America, USA

Detailed view of the discoloration caused by bacteria and algae on a geyser, Geyser Hill, Old Faithful Area, Yellowstone National Park, Wyoming, USA, North America

Steppe, open plain, Polloquere springs, thermal baths, Salar de Surire, Salt Lake, Reserva Nacional de las Vicunas, Lauca National Park, Altiplano, Norte Grande, Northern Chile, Chile, South America

Tourist on a boardwalk amidst the steam of the springs and geysers, Black Sand Basin, Upper Geyser Basin, Yellowstone National Park, Wyoming, United States of America, USA

Orange Mound Road, Upper Terraces, limestone sinter terraces, geysers, hot springs, colorful thermophilic bacteria, microorganisms, dead trees, Mammoth Hot Springs Terraces in Yellowstone National Park, Wyoming, America

Opalescent Pool, geyser, drainage area with coloured thermophilic bacteria, microorganisms, Black Sand Basin, Upper Geyser Basin, Yellowstone National Park, Wyoming, United States of America, USA

Canary Spring Terrace, limestone sinter terraces, geysers, hot springs, in front of Mount Everts, Mammoth Hot Springs Terraces in Yellowstone National Park, Idaho, Montana, Wyoming, America

Orange Mound Terrace, Upper Terraces, limestone sinter terraces, geysers, hot springs, colorful thermophilic bacteria, microorganisms, dead trees, Mammoth Hot Springs Terraces, Yellowstone National Park, Wyoming, United States of America, USA

Palette Spring Street, Lower Terraces, limestone sinter terraces, geysers, hot springs, colorful thermophilic bacteria, microorganisms, dead trees, Mammoth Hot Springs Terraces in Yellowstone National Park, Wyoming, America

Tourists on boardwalk, Grand Prismatic Spring, Midway Geyser Basin, colored thermophilic bacteria, microorganisms, hot springs, Yellowstone National Park, Wyoming, United States of America, USA

Orange Mound Road, Upper Terraces, limestone sinter terraces, geysers, hot springs, colorful thermophilic bacteria, microorganisms, dead trees, Mammoth Hot Springs Terraces in Yellowstone National Park, Wyoming, America

Effluent area of the Canary Spring Terrace, limestone sinter terraces, geysers, hot springs, colorful thermophilic bacteria, microorganisms, Mammoth Hot Springs Terraces in Yellowstone National Park, Idaho, Montana, Wyoming, America

Liberty Cap, extinct travertine cone geyser, Canary Spring Terrace, limestone sinter terraces, geysers, hot springs, Mammoth Hot Springs Terraces in Yellowstone National Park, Wyoming, United States of America, USA

Sunset Lake, geyser, drainage area with a boardwalk, coloured thermophilic bacteria, microorganisms, Black Sand Basin, Upper Geyser Basin, Yellowstone National Park, Wyoming, United States of America, USA

Vixen Geyser, prohibition sign, Back Basin, Norris Geyser Basin, geysers, geothermal springs in Yellowstone National Park, Wyoming, United States of America, USA

Detailed view of the Black Pool, West Thumb Geyser Basin, Yellowstone Lake, Yellowstone National Park, Teton County, Wyoming, USA

Coloured thermophilic bacteria, the outlet of Cliff Geyser, Fire Hole River, Black Sand Basin, Upper Geyser Basin, Yellowstone National Park, Wyoming, United States of America, USA

Fossilized, dead trees in the Angel Terrace, Upper Terraces, limestone sinter terraces, hot springs, Mammoth Hot Springs Terraces, Yellowstone National Park, Wyoming, United States of America, USA

Detailed view of the discoloration caused by bacteria and algae on a geyser, Geyser Hill, Old Faithful Area, Yellowstone National Park, Wyoming, USA, North America

Punch Bowl Spring, geyser, drainage area, coloured thermophilic bacteria, microorganisms, Black Sand Basin, Upper Geyser Basin, Yellowstone National Park, Wyoming, United States of America, USA

Tourists on boardwalk, steaming geothermal springs, geysers, Midway Geyser Basin, Yellowstone National Park, Wyoming, United States of America, USA

Emerald Pool, geyser, drainage area with a boardwalk, coloured thermophilic bacteria, microorganisms, Black Sand Basin, Upper Geyser Basin, Yellowstone National Park, Wyoming, United States of America, USA

Outlet of the Pinwheel Geyser, Porcelain Basin, Norris Geyser Basin, colored thermophilic bacteria, microorganisms, geysers, geothermal springs in Yellowstone National Park, Wyoming, United States of America, USA

Tourists on boardwalk, Grand Prismatic Spring, Midway Geyser Basin, colored thermophilic bacteria, microorganisms, hot springs, Yellowstone National Park, Wyoming, United States of America, USA

Devil's Thumb, Palette Spring Street, Lower Terraces, limestone sinter terraces, geysers, hot springs, colorful thermophilic bacteria, microorganisms, petrified trees, Mammoth Hot Springs Terraces in Yellowstone National Park, Wyoming, United States of Am

View over Firehole River, Geyser Hill, Upper Geyser Basin, geothermal springs in Yellowstone National Park, Wyoming, United States of America, USA

Emerald Pool Geyser, drainage area, colored thermophilic bacteria, microorganisms, geothermal sources, Black Sand Basin, Upper Geyser Basin, Yellowstone National Park, Wyoming, United States of America, USA

Drainage area of New Blue Spring Terrace, limestone sinter terraces, geysers, hot springs, colorful thermophilic bacteria, microorganisms, Mammoth Hot Springs Terraces in Yellowstone National Park, Wyoming, United States of America, USA

Dead trees on the Angel Terrace, Upper Terraces, limestone sinter terraces, geysers, hot springs, Mammoth Hot Springs Terraces, Yellowstone National Park, Wyoming, United States of America, USA

People on a cordwood bridgeway at the Grand Prismatic Spring, Midway Geyser Basin, Yellowstone National Park, Wyoming, USA

Palette Spring Street, Lower Terraces, limestone sinter terraces, geysers, hot springs, colorful thermophilic bacteria, microorganisms, dead trees, Mammoth Hot Springs Terraces in Yellowstone National Park, Wyoming, America

Canary Spring Terrace, limestone sinter terraces, geysers, hot springs, colorful thermophilic bacteria, Mammoth Hot Springs Terraces in Yellowstone National Park, Wyoming, United States of America, USA

Tourists on a boardwalk amidst the steam of the springs and geysers, Black Sand Basin, Upper Geyser Basin, Yellowstone National Park, Wyoming, United States of America, USA

Palette Spring Terrace, Lower Terraces, limestone sinter terraces, geysers, hot springs, colorful thermophilic bacteria, microorganisms, dead trees, Mammoth Hot Springs Terraces, Yellowstone National Park, Wyoming, United States of America, USA

Steppe, open plain, Polloquere springs, thermal baths, Salar de Surire, Salt Lake, Reserva Nacional de las Vicunas, Lauca National Park, Altiplano, Norte Grande, Northern Chile, Chile, South America

Orange Mound Road, Upper Terraces, limestone sinter terraces, geysers, hot springs, colorful thermophilic bacteria, microorganisms, dead trees, Mammoth Hot Springs Terraces in Yellowstone National Park, Wyoming, America

Eruption of the Old Faithful geyser, Upper Geyser Basin, geothermal springs in Yellowstone National Park, Wyoming, United States of America, USA

Emerald Pool, geyser, drainage area with a boardwalk, coloured thermophilic bacteria, microorganisms, Black Sand Basin, Upper Geyser Basin, Yellowstone National Park, Wyoming, United States of America, USA

Turquoise Pool, Midway Geyser Basin, hot springs, Yellowstone National Park, Wyoming, United States of America, USA

Boardwalk on Mound and Jupiter Spring Terrace, Main Terrace, limestone sinter terraces, geysers, hot springs, Mammoth Hot Springs Terraces in Yellowstone National Park, Wyoming, United States of America, USA

Black Opal Spring, geyser, Biscuit Basin, Upper Geyser Basin, Yellowstone National Park, Wyoming, United States of America, USA

Petrified tree, runoff area of the Grand Prismatic Spring, Midway Geyser Basin, colored thermophilic bacteria, microorganisms, hot springs, Yellowstone National Park, Wyoming, United States of America, USA

Palette Spring Terrace, Lower Terraces, limestone sinter terraces, geysers, hot springs, colorful thermophilic bacteria, microorganisms, Mammoth Hot Springs Terraces in Yellowstone National Park, Wyoming, United States of America, USA

Tourists in front of an Old Faithful geyser eruption, Upper Geyser Basin, geothermal springs in Yellowstone National Park, Wyoming, United States of America, USA

Sunset Lake, geyser, drainage area, coloured thermophilic bacteria, microorganisms, Black Sand Basin, Upper Geyser Basin, Yellowstone National Park, Wyoming, United States of America, USA

Fountain Paint Pots, mud pots, Firehole Lake Drive, Lower Geyser Basin, Yellowstone National Park, Wyoming, United States of America, USA

Runoff from Excelsior Geyser into Firehole River, Midway Geyser Basin, colored thermophilic bacteria, microorganisms, geysers, hot springs, Yellowstone National Park, Wyoming, United States of America, USA

Eruption of the Old Faithful geyser, Upper Geyser Basin, geothermal springs in Yellowstone National Park, Wyoming, United States of America, USA

Dead trees at Angel Terrace, Upper Terraces, limestone sinter terraces, geysers, hot springs, Mammoth Hot Springs Terraces in Yellowstone National Park, Wyoming, America

Tourists taking photos while on a boardwalk amidst the steam of the springs and geysers, Black Sand Basin, Upper Geyser Basin, Yellowstone National Park, Wyoming, United States of America, USA

New Blue Spring, limestone sinter terraces, geysers, hot springs, dead trees, in Mount Everts, Mammoth Hot Springs Terraces in Yellowstone National Park, Idaho, Montana, Wyoming, America

Emerald Pool, geyser, drainage area with a boardwalk, coloured thermophilic bacteria, microorganisms, Black Sand Basin, Upper Geyser Basin, Yellowstone National Park, Wyoming, United States of America, USA

Emerald Pool, geyser, outlet area, colourful thermophilic bacteria, microorganisms, boardwalk, Black Sand Basin, Upper Geyser Basin, Yellowstone National Park, Wyoming, United States of America, USA

Outlet of the Excelsior Geyser in Firehole River, Midway Geyser Basin, colourful thermophilic bacteria, microorganisms, geysers, hot springs, Yellowstone National Park, Wyoming, United States of America, USA

Chromatic Pool Geyser, thunderstorm clouds at the back, Upper Geyser Basin, geysers, geothermal hot-pools, Yellowstone National Park, Wyoming, USA

Palette Spring Terrace, Lower Terraces, limestone sinter terraces, geysers, hot springs, colorful thermophilic bacteria, microorganisms, dead trees, Mammoth Hot Springs Terraces, Yellowstone National Park, Wyoming, United States of America, USA

Orange Mound Road, Upper Terraces, limestone sinter terraces, geysers, hot springs, colorful thermophilic bacteria, microorganisms, dead trees, Mammoth Hot Springs Terraces in Yellowstone National Park, Wyoming, America

Morning Glory Pool Geyser, Upper Geyser Basin, geothermal springs in Yellowstone National Park, Wyoming, United States of America, USA

Tourists watching the eruption of the Daisy Geyser, Upper Geyser Basin, geothermal springs in Yellowstone National Park, Wyoming, United States of America, USA

Tourists on a boardwalk amidst the steam of the springs and geysers, Black Sand Basin, Upper Geyser Basin, Yellowstone National Park, Wyoming, United States of America, USA

Eruption of the Old Faithful geyser, Upper Geyser Basin, geothermal springs in Yellowstone National Park, Wyoming, United States of America, USA

Canary Spring Terrace, limestone sinter terraces, geysers, hot springs, colorful thermophilic bacteria, Mammoth Hot Springs Terraces in Yellowstone National Park, Wyoming, United States of America, USA

Minerva Spring Terrace, Lower Terraces, limestone sinter terraces, geysers, geothermal springs, Mammoth Hot Springs Terraces in Yellowstone National Park, Wyoming, United States of America, USA

Cistern Spring Geyser, Back Basin, Norris Geyser Basin, geysers, geothermal springs in Yellowstone National Park, Wyoming, United States of America, USAational Park, National Park, Wyoming, United States of America, USA

Devil's Thumb, Palette Spring Street, Lower Terraces, limestone sinter terraces, geysers, hot springs, colorful thermophilic bacteria, microorganisms, petrified trees, Mammoth Hot Springs Terraces in Yellowstone National Park, Wyoming, United States of Am

Dead trees at Angel Terrace, Upper Terraces, limestone sinter terraces, geysers, hot springs, Mammoth Hot Springs Terraces in Yellowstone National Park, Wyoming, America

Palette Spring Terrace, Lower Terraces, limestone sinter terraces, geysers, hot springs, colorful thermophilic bacteria, microorganisms, Mammoth Hot Springs Terraces, Yellowstone National Park, Wyoming, United States of America, USA