Jack Dykinga / Scalding hot water continuously spouting behind layers of mineral deposits, Fly Geyser, Black Rock Desert, Great Basin Desert, Nevada, USA

Milan Radisics / Aerial shot of steam geysers at Gunnhuver Hot Springs, Reykjanes Peninsula, Iceland, August 2018.

Milan Radisics / Aerial shot of steam geysers at Gunnhuver Hot Springs, Reykjanes Peninsula, Iceland, August 2018.

Milan Radisics / Aerial shot of Gunnuhver steam geyser, Gunnhuver Hot Springs, Reykjanes Peninsula, Iceland, August 2018.

Milan Radisics / Aerial shot of Gunnuhver steam geyser, Gunnhuver Hot Springs, Reykjanes Peninsula, Iceland, August 2018.

Jeff Foott / Morning Glory Pool, Upper Geyser Basin, Yellowstone National Park, Wyoming

Jeff Foott / Fumaroles, Porcelain Basin, Norris Geyser Basin, Yellowstone National Park, Wyoming

Jeff Foott / Geyser spouting, Old Faithful, Yellowstone National Park, Wyoming

Yva Momatiuk & John Eastcott / Rhyolite mountains and geothermal vents, Kerlingarfjoll, Iceland

Sergey Gorshkov / Plume of volcanic ash lit by a basaltic lava flow from the Tolbachik volcano complex, Kamchatka, Far East Russia, eruption lasted from December 22nd 2012 through to January 2nd 2013

Sergey Gorshkov / Plume of volcanic ash lit by a basaltic lava flow from the Tolbachik volcano complex, Kamchatka, Far East Russia, eruption lasted from December 22nd 2012 through to January 2nd 2013

Tui De Roy / Galapagos hawk (Buteo galapagoensis) perched over sulphurous slope, Galapagos, Ecuador. Vulnerable species.

Ingo Arndt / Burned trees in front of Grand Prismatic Spring, Midway Geyser Basin, Yellowstone National Park, Wyoming, USA, September 2011.

Ingo Arndt / Grand Prismatic Spring, Midway Geyser Basin, Yellowstone National Park, Wyoming, USA, September 2011.

Doug Perrine / Hot lava from the 61G flow, emanating from Pu'u O'o on Kilauea Volcano, flows over sea cliffs into the ocean under the stars and moon, Kamokuna, Kalapana, Hawaii Volcanoes National Park, Puna, Hawaii...

Enrique Lopez-Tapia / Travelers watching lava on Erta Ale volcano crater. Afar Region, Ethiopia, Africa. November 2014.

Christophe Courteau / Lava Lake at night in the crater of Nyiragongo Volcano, Virunga National Park, North Kivu Province, Democratic Republic of Congo. September 2015.

Christophe Courteau / Lava Lake at night in the crater of Nyiragongo Volcano, Virunga National Park, North Kivu Province, Democratic Republic of Congo. September 2015.

Christophe Courteau / Steam rising from the crater of Nyiragongo Volcano. Virunga National Park, North Kivu Province, Democratic Republic of Congo. September 2015.

Pedro Narra / Scientists observing lava and ash plume erupting from Fogo Volcano, Fogo Island, Cape Verde, 29th November 2014.

Jeff Vanuga / Night eruption of White Dome Geyser with the Milky Way. Yellowstone National Park, Wyoming, USA, October 2015.

Jeff Vanuga / Ephydrid flies (Ephydra sp) that eat microscopic algae and survives during the winter in thermal pools. Biscut Basin, Yellowstone National Park, Wyoming, USA, January.

Jeff Vanuga / Old Faithful Geyser erupting at -30 Celsius in winter. Upper Geyser Basin, Yellowstone National Park, Wyoming, USA, January 2015.

Doug Perrine / Red hot lava from Kilauea Volcano flowing into ocean at West Kailiili, Hawaii Volcanoes National Park, Big Island, Hawaiian Islands, USA.

Eric Baccega / Sulphur formation, Dallol Volcano, Danakil Depression, Ethiopia, March 2015.

Eric Baccega / Dallol hot spring with salt concretions coloured by sulphur, potassium and iron, Dallol Volcano, Danakil Depression, Ethiopia, March 2015.

Eric Baccega / Dallol hot spring with salt concretions coloured by sulphur, potassium and iron, Dallol Volcano, Danakil Depression, Ethiopia, March 2015.

Eric Baccega / Dallol hot spring with salt concretions coloured by sulphur, potassium and iron, Dallol Volcano, Danakil Depression, Ethiopia, March 2015.

Claudio Contreras / American coot (Fulica americana americana) in mist, with Popocatepetl volcano behind, Xochimilco wetlands, Mexico City, Mexico. November.

Kirkendall-Spring / Hikers on the trail to Three Fingered Jack, Mount Jefferson Wilderness, Duschutes National Forest. Oregon, USA, July 2014. Model released.

Tom Gilks / Nyiragongo volcano lava lake, Virungas National Park, Democratic Republic of Congo February 2015.

Tom Gilks / Nyiragongo volcano at night, Virungas National Park, Democratic Republic of Congo February 2014.

Denis-Huot / Three Lesser flamingos (Phoeniconaias minor) silhouetted in front of geyser, Lake Bogoria National Reserve, Kenya.

Floris van Breugel / A hot spring in the West Thumb Geyser Basin, Yellowstone National Park, Wyoming. The colors are a result of thermophilic bacteria living in the hot springs. December 2010.

Mark MacEwen / Japanese macaque (Macaca fuscata) relaxing in hot spring in Jigokudani, Yaenkoen, Nagano, Japan, February.

Anup Shah / Japanese Macaque (Macaca fuscata) baby sitting on the edge of thermal hotspring pool. Jigokudani Yean-Koen National Park, Japan, February.

Peter Cairns / Calcified trees at Tangled Creek in winter, Yellowstone National Park, Wyoming, USA, February 2013.

Peter Cairns / Calcified trees at Tangled Creek in winter, Yellowstone National Park, Wyoming, USA, February 2013.

Peter Cairns / Bison (Bison bison) standing in geothermal run-off in winter, Yellowstone National Park, Wyoming, USA, February.

Guy Edwardes / Quilota Crater Lake, Cotopaxi Province, Ecuador, September 2010.

Tui De Roy / Fissure eruption of Chico Volcano into 9km diameter caldera. Sierra Negra volcano, Isabela Island, Galapagos, Ecuador. October 2005.

Tui De Roy / People watching the Fissure eruption of Chico volcano into 9km diameter caldera. Sierra Negra volcano, Isabela Island, Galapagos, Ecuador. October 2005.

Tui De Roy / Volcanic caldera - caldera lake steaming after eruption. Fernandina Island, Galapagos, Ecuador.

Denis-Huot,Denis-Huot / Lesser flamingo (Phoeniconaias minor) aerial view of flock and geyser, Bogoria Game Reserve, Kenya

Diane McAllister / Japanese Macaques (Macaca fuscata) enjoy time soaking and grooming in the hot spring in Jigokudani, Japan.

Diane McAllister / Japanese Macaque (Macaca fuscata) adult with wet snowy head in the hot springs of Jigokudani, Japan.

Diane McAllister / Japanese Macaque (Macaca fuscata) adult in the hot springs of Jigokudani, in the snow, Japan. February

Orsolya Haarberg,Orsolya Haarberg / Rhiolite mountains. Landmannalaugar, Iceland. June 2008

Ben Cranke,Ben Cranke / Japanese Macaques (Macaca fuscatata) grooming in hot springs, Jigokudani, Nagano Prefecture, Honshu, Japan

Diane McAllister,Diane McAllister / Japanese Macaque (Macaca fuscata) juvenile approaches the hot springs and feeding area covered in icy snow from the cold night before in Jigokudani, Japan, January

Diane McAllister,Diane McAllister / Japanese Macaque (Macaca fuscata) young one, appearing quite relaxed in thermal pool, even falling asleep, in Jigokudani, Japan, February

Diane McAllister,Diane McAllister / Japanese Macaque (Macaca fuscata) with icy strands of fur on its head, Jigokudani, Japan, February

Diane McAllister,Diane McAllister / Japanese Macaque (Macaca fuscata) females gather at one end of the hot springs, Jigokudani, Japan, February

Diane McAllister / Japanese Macaque (Macaca fuscata) biting needles from tree branch while sitting in hot spring in Jigokudani, Japan, January

Igor Shpilenok / Red Fox (Vulpes vulpes) in wide landscape with Kronotsky Volcano on the horizon. Kronotsky Zapovednik Nature Reserve, Kamchatka Peninsula, Russian Far East, March.

Wild Wonders of Europe / O. Haarberg / Volcanic activity, Steam vent, Hverir, Nmafjall, Iceland, July 2008

Erlend Haarberg,Erlend Haarberg / Aerial view down river to the east of the Hofsjakull glacier and west of the Sprengisandur upland desert. Innumerable rivulets flow from beneath the glacier in this area of tundra which abounds in pon...

Jeff Vanuga / Aerial view of Grand Prismatic Springs Midway Geyser Basin. Yellowstone National Park, Wyoming, July 2011.

Floris van Breugel / A skier glides past an erupting geyser in the Old Faithful geyser basin in Yellowstone National Park. The cold temperatures in the winter cause the geysers to release more steam than usual making the...

Christophe Courteau / Steaming vents of Namafjall, near Myvatn, Iceland

Paul D Stewart / Aerial view of Grand Prismatic thermal spring in Yellowstone National Park, USA. The bright colours are natural, coming from thermophile bacteria in the water. People can be seen walking on the raised...

Erlend Haarberg / Fumaroles at Hverir at night with northern lights in sky above, Namafjall, Iceland, February 2011

Erlend Haarberg / Volcanic eruption at Eyjafjallajokull with ash and lava exploding into the air at night, Iceland, May 2010

Erlend Haarberg / Volcanic eruption at Eyjafjallajokull with lightning in the ash plume, Iceland, April 2010

Erlend Haarberg / Grasses moving in wind in front of acidic steam and solidified lava surface at Leirhnjukur, Iceland 2008

Jack Dykinga / Scalding hot water continuously spouting behind layers of mineral deposits, Fly Geyser, Black Rock Desert, Great Basin Desert, Nevada, USA

Erlend Haarberg / Steam vents at night with northern lights, Hverir, Namafjall, Iceland, February 2011

Erlend Haarberg / Steam vents at night, Hverirt, Namafjall, Iceland, February 2011

Orsolya Haarberg / Steam vents with northern lights at night, Hverir, Namafjall, Iceland, February 2011

Orsolya Haarberg / Colourful rhyolite mountain landscape, Landmannalaugar, Sveinsgil, Fjallabak Nature Reserve, Iceland, August 2010

Erlend Haarberg / Blahver hot spring and Eyvindarhver fumarole, Hveravellir, Iceland, May 2010

Hanne & Jens Eriksen / Fumarole in the Krafla volcano area, Iceland, June 2009

Peter Cairns / Castle Geyser erupting at dawn, Old Faithful geothermal area, Yelowstone National Park, Wyoming, USA, September 2008

Peter Cairns / Parched trees in front of Grand Prismatic Spring geothermal area, Yelowstone National Park, Wyoming, USA, September 2008

Loic Poidevin / Mineral deposits at the Dallol hydrothermal site, Salt lake Karoum, Danakil depression, Ethiopia, February 2009

Orsolya Haarberg / Ash plume, white cloud and snowy ridge at the subglacial volcanic eruption under the Eyjafjallajokull ice cap in Iceland, April 2010. Second place in Landscape category of the GDT 2011 competition

Jeff Vanuga / Thermal hot spring at Mud Volcano, Hayden Valley, Yellowstone National Park, Wyoming, USA.

Rob Tilley / River of lava flowing from the Pacaya volcano, Los Pocitos, Guatemala, Central America, June 2010

Guy Edwardes / View of pipework and Geothermal power plant, Reykjanesvirkjun, South West Iceland, July 2009

Guy Edwardes / View of pipework and Geothermal power plant, Reykjanesvirkjun, South West Iceland, July 2009

Sergey Gorshkov / Steam emitted from geysers, Geyser River, Valley of Geysers, Kamchatka, Russia

Sergey Gorshkov / Steam emitted from geysers, Geyser River, Valley of Geysers, Kamchatka, Russia

Sergey Gorshkov / Geyser River and geysers in background, Valley of Geysers, Kamchatka, Russia

Sergey Gorshkov / Bubbling geothermal mud pool, Kamchatka, Russia

Chadden Hunter / Dallol hot springs where water heated by magma laden with potassium, sulphur and iron spews up through salt pans staining the salt deposits with vivid colours, in the bottom of the Rift Valley, 120 me...

Uri Golman / Helicopter flying over volcanic eruption near Eyjafjallajoekull glacier, Iceland, 24th March 2010. Volcano previously dormant since 1821.

Juan Carlos Munoz / Eyjafjallajkull volcano erupting, Fimmvruhls area, Iceland, 7th of April 2010

Juan Carlos Munoz / Eyjafjallajkull volcano erupting, Fimmvruhls area, Iceland, 7th of April 2010

Juan Carlos Munoz / Eyjafjallajökull volcano erupting, Fimmvörðuháls area, Iceland, 7th of April 2010

Juan Carlos Munoz / Eyjafjallajökull volcano erupting, Fimmvörðuháls area, Iceland, 7th of April 2010

Juan Carlos Munoz / Eyjafjallajkull volcano erupting, Fimmvruhls area, Iceland, 5th of April 2010

Juan Carlos Munoz / Eyjafjallajökull volcano erupting, Fimmvörðuháls area, Iceland, 7th of April 2010

Jeff Vanuga / Dead Thermal Spider encased in thermophilic bacteria in hot Spring, Yellowstone National Park, Wyoming, USA, October

Jeff Vanuga / Bull Bison (Bison bison) warming himself in the steam from the Firehole River, Upper Geyser Basin, Yellowstone National Park, Wyoming, USA, January

Jeff Vanuga / Boiling mud in Pocket Basin, Yellowstone National Park, Wyoming, USA, June 2006

Jeff Vanuga / Lone Star Geyser erupting in Lone Star Geysyer Basin at night, Yellowstone National Park, Wyoming, USA, October 2007