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

Juergen Freund / Volcano erupting with laval flow. Siau island Sangihe Talaud Is Sulawesi Indonesia

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 / Steam rising from 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 / Lava Lake at night in 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 at night, Virungas National Park, Democratic Republic of Congo February 2014.

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

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

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 / 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.

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.

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

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

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

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