Uri Golman / Volcanic eruption near Eyjafjallajoekull glacier, ash and smoke exploding into the air, Iceland, 24/03/2010. Volcano dormant since 1821.

Uri Golman / Volcanic eruption near Eyjafjallajoekull glacier, Iceland, 24/03/2010. Volcano dormant since 1821.

Uri Golman / Volcanic eruption near Eyjafjallajoekull glacier, Iceland, 24/03/2010. Volcano dormant since 1821.

Marie Read / Black-necked stilts (Himantopus mexicanus) pair performing post-copulatory display (as copulation ends, the male slides off the female leaving his wings draped over her and crossing his bill with hers...

Shane P. White / Tephra during volcanic eruption, Mount Yasur, Tanna Island, Vanuatu

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

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

Vincent Grafhorst / Minden / Crater of active volcano at twilight, Erta Ale, Danakil Depression, Ethiopia

Vincent Grafhorst / Man looking into crater at night, Mount Nyiragongo, Virunga National Park, Democratic Republic of the Congo

Vincent Grafhorst / Lava in volcanic crater, Mount Nyiragongo, Virunga National Park, Democratic Republic of the Congo

Tony Wu / Family of Sperm whales (Physeter macrocephalus) engaged in social activity, rubbing against each other, Indian Ocean, March.

Tony Wu / Aggregation of Sperm whales (Physeter macrocephalus) engaged in social activity. Indian Ocean, March.

Orsolya Haarberg / High angle view of person walking on frozen lake of cracked ice. Lofoten Isands, Norway. January. Highly commended in the Landscape Category of the Oasis Photography Competition 2017. Highly commended...

Pete Oxford / Pahoehoe lava formations, Sullivan Bay, Santiago Island, Galapagos Islands, Ecuador

Pete Oxford / Pahoehoe lava formations, Sullivan Bay, Santiago Island, Galapagos Islands, Ecuador

Andy Rouse / Coquerel's Sifaka (Propithecus coquereli) jumping, Palmarium Reserve, Madagascar

Andy Rouse / Coquerel's Sifaka (Propithecus coquereli) jumping, Palmarium Reserve, Madagascar

Andy Rouse / Verreaux Sifaka (Propithecus verreauxi) jumping ('dancing') across ground, Madagascar

Andy Rouse / Verreaux Sifaka (Propithecus verreauxi) jumping ('dancing') across ground, Madagascar

Andy Rouse / Verreaux Sifaka (Propithecus verreauxi) jumping ('dancing') across ground, Madagascar

Andy Rouse / Verreaux Sifakas (Propithecus verreauxi) jumping ('dancing') across ground, Madagascar

Ernie Janes,Ernie Janes / Yellow Labrador jumping breakwater, Norfolk. April

Cheryl-Samantha Owen / West Coast Rock Lobster (Jasus lalandii) observed by diver. Kalk Bay, Atlantic Ocean, False Bay, Valsebaai, Western Cape, South Africa

D. Parer & E. Parer-Cook / Volcanic caldera, Daphne Island, Galapagos Islands, Ecuador

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

Sergey Gorshkov / Tolbachik Volcano erupting, Kamchatka, Russia

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

Enrique Lopez-Tapia / Climber on Kala Pattar peak (5545m) with Buddhist prayer flags at sunset. Sagarmatha National Park UNESCO World Heritage Site, Khumbu/Everest Region, Nepal, Himalaya. October 2011. Winner of Mountain...

Doc White / Steam from underwater volcanic activity. Socorro Island, Baja Mexico.

Dietmar Nill / Barn swallow {Hirundo rustica} flying over water with mouth open, hunting for insects, Germany

Laurent Geslin / Landscape of mountains in winter, with walkers crossing peaks, in the Jura region, Switzerland. January 2009

Jerry Monkman / A man climbs "Top of the Prow" rock on Cathedral Ledge. Echo Lake State Park, White Mountains, in North Conway, New Hampshire, USA. October 2009, Model released

Jerry Monkman / A man climbs "Top of the Prow" rock on Cathedral Ledge. Echo Lake State Park, White Mountains, in North Conway, New Hampshire, USA. October 2009, Model released

Jerry Monkman / A man rock climbing near the top of Cathedral Ledge. Echo Lake State Park, White Mountains, in North Conway, New Hampshire, USA. October 2009, Model released

Tim Laman / Boy (5 years) working on activity sheet in Olympic National Park, Washington, USA, August 2005, Model released

Tim Laman / A young boy (model released) aged 9, hiking in the rainforest in Borneo. July 2007

Jerry Monkman / Man walking with his climbing gear at Lower Slab in Pawtuckaway State Park, New Hampshire, USA, September 2008. Model released.

Jerry Monkman / Man bouldering in "The Boulders" section of Pawtuckaway State Park, New Hampshire, USA, September 2008. Model released.

Jerry Monkman / Lone hiker at sunrise on the Bold Coast trail in Cutler, Maine, USA, June 2009. Model released

Uri Golman / Volcanic eruption near Eyjafjallajoekull glacier, hot lava flowing down into the Thorsmork valley, Iceland, 24/03/2010. Volcano dormant since 1821.

Uri Golman / Volcanic eruption near Eyjafjallajoekull glacier, hot lava flowing down into the Thorsmork valley, Iceland, 24/03/2010. Volcano dormant since 1821.

Jeff Vanuga / Snowmobiling in the Bridger - Teton National Forest on Togwotee Pass near Dubois, Wyoming. Model released, January 2009

Jeff Vanuga / Snowmobiling in the Bridger - Teton National Forest on Togwotee Pass near Dubois, Wyoming. Model released, January 2009

Stephen Belcher / Anak Krakatau erupting in May 2009, Ujung Kulon National Park, Sunda Strait, Indonesia

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

Wild Wonders of Europe / O Haarberg / Boiling mudpool, volcanic activity, Hverir, Nmafjall, Iceland, July 2008

Orsolya Haarberg / Acidic steam and solidified lava surface at Leirhnjkur. Iceland. July 2008

Orsolya Haarberg / Steam vents and sulphur deposit at Hverir. Nmafjall, Iceland. June 2008

Orsolya Haarberg / Rhiolite mountains at Landmannalaugar. Rhyiolite volcanism. Iceland. June 2008

Orsolya Haarberg / Steam vent at Hverir. Nmafjall, Iceland. June 2008

Wild Wonders of Europe / O Haarberg / Boiling mudpool, volcanic activity, Hverir, Nmafjall, Iceland, July 2008

Wild Wonders of Europe / O Haarberg / Boiling mudpool, volcanic activity, Hverir, Nmafjall, Iceland, July 2008

Yva Momatiuk & John Eastcott / Volcanic Ubehebe Crater, Death Valley National Park, California

Yva Momatiuk & John Eastcott / Great Fountain Geyser erupting, Yellowstone National Park, Wyoming

Pete Oxford / Geothermal activity as evidenced by bubbles eminating from the seabed, Roca Redonda and eroded volcano in mid ocean north of Isabela Island, Galapagos Islands, Ecuador, South America

Inaki Relanzon / Lava fields in the Landmannalaugar mountains, central Iceland. July 2008

Igor Shpilenok / Kamchatka brown bear (Ursus arctos beringianus) at the "Stained glass window" in the Valley of the Geysers, Kronotsky Zapovednik, Kamchatka, Far East Russia

Igor Shpilenok / Kamchatka brown bear (Ursus arctos beringianus) at the Malachite Grotto, Valley of the Geysers, Kronotsky Zapovednik, Kamchatka, Far East Russia

Igor Shpilenok / Kamchatka brown bear (Ursus arctos beringianus) at the 'Stained glass window', Valley of the Geysers, Kronotsky Zapovednik, Kamchatka, Far East Russia

Igor Shpilenok / Kamchatka brown bear (Ursus arctos beringianus) enjoys hot steam from a geyser in Valley of the Geysers, Kronotsky Zapovednik, Kamchatka, Far East Russia

Igor Shpilenok / Water flowing over rapids in the Geyser River, Kronotsky Zapovednik, Kamchatka, Far East Russia

Patricio Robles Gil / Yasur Volcano erupting, Tana Island, Vanuatu Archipelago, New Hebrides

Pete Oxford / Bartolome Island a landscape of lava and ash, Galapagos Islands, Ecuador

Tui De Roy / Waved Albatross (Phoebastria irrorata) courtship dance under rainy season clouds, Punta Cevallos, Espanola Island, Galapagos Islands, Ecuador

Igor Shpilenok / Boiling red clay mud pots with steam, caused by underground volcanic activity, Valley of the Geysers, Kronotsky Zapovednik Reserve, Russia.

Pete Oxford / Sulphur fulmerole in crater of active volcano, Sierra Negra, Isabela Is, Galapagos

Pete Oxford / Sol de Manana fumeroles geothermal activity at 4850 metres Altiplano, SW Bolivia

Sumio Harada / Red Squirrel (Tamiasciurus hudsonicus) separating seeds from an Engelmann Spruce (Picea engelmannii) cone to store for winter food, Rocky Mountains, Alberta, Canada

Konrad Wothe / Red-crowned Crane (Grus japonensis) pair calling and jumping during courtship, Hokkaido, Japan

Tim Fitzharris / Castle Geyser, Yellowstone National Park, Wyoming

Pete Oxford / Chagra cowboy portrait with roses in his hat band, on an overnight ride at a hacienda to herd cattle, Andes Mountains, Ecuador

Patricio Robles Gil / Aboriginal man with his face painted for the Mt Hagen cultural show, Papua New Guinea

Patricio Robles Gil / Aboriginal man wearing tribal headdress costume for the Mt Hagen cultural show, Papua New Guinea

Patricio Robles Gil / Aboriginal man wearing tribal headdress made with feathers from Bird-of-Paradise, Parrots and Lorikeets, Papua New Guinea

Tui De Roy / Lava Cactus (Brachycereus nesioticus) endemic pioneering species growing only on young lava flows, Bartolome Island, Galapagos Islands, Ecuador

Tui De Roy / Antipodean Albatross (Diomedea antipodensis) courtship display often pirouetting with outstretched wings, Adams Island, Auckland's Group, New Zealand

Tui De Roy / Blue-footed Booby (Sula nebouxii) pair performing courtship dance, Seymour Island, Galapagos Islands, Ecuador

Tui De Roy / Great Frigatebird (Fregata minor) courting males vying for female's attention, Genovesa Tower Island, Galapagos Islands, Ecuador

Tui De Roy / Great Frigatebird (Fregata minor) recently formed pair, female inspecting male in courtship display with extended gular pouch, Genovesa Tower Island, Galapagos Islands, Ecuador

Mitsuaki Iwago / Siberian Crane (Grus leucogeranus) pair courting in front of setting sun, China

Tui De Roy / Galapagos Giant Tortoise (Chelonoidis nigra) on caldera rim, Alcedo Volcano, Isabella Island, Galapagos Islands, Ecuador

Tui De Roy / Galapagos Giant Tortoise (Chelonoidis nigra) yawning, Alcedo Volcano, Isabella Island, Galapagos Islands, Ecuador

Tui De Roy / Galapagos Land Iguana (Conolophus subcristatus) female searching for descent route into 1, 000 meter active caldera to nest, Fernandina Island, Galapagos Islands, Ecuador

Tui De Roy / Galapagos Hawk (Buteo galapagoensis) overlooking 1000 meter deep active caldera, Fernandina Island, Galapagos Islands, Ecuador

Tui De Roy / Galapagos Land Iguana (Conolophus subcristatus) rare social group basking together, Fernandina Island, Galapagos Islands, Ecuador

Tui De Roy / Blue-footed Booby (Sula nebouxii) pair performing courtship dance, Seymour Island, Galapagos Islands, Ecuador

Tui De Roy / Galapagos Giant Tortoise (Chelonoidis nigra) large male on caldera rim, Alcedo Volcano, Isabella Island, Galapagos Islands, Ecuador

Tui De Roy / Cerro Azul caldera with lake and tufa cone at 5,900 feet, Cerro Azul Volcano, Isabella Island, Galapagos Islands, Ecuador

Tui De Roy / Volcanic eruption, radial flank fissure, February 1979, lava fountaining from splatter cone at dusk, Cerro Azul, Isabella Island, Galapagos Islands, Ecuador

Tui De Roy / Volcanic eruption, spatter cone formation and lava fountain from radial fissure, February 1979, Cerro Azul east flank, Isabella Island, Galapagos Islands, Ecuador

Tui De Roy / Volcanic eruption, spatter cone formation and lava fountain from radial fissure, February 1979, Cerro Azul east flank, Isabella Island, Galapagos Islands, Ecuador

Tui De Roy / Volcanic eruption, spatter cone formation and lava fountain from radial fissure, February 1979, Cerro Azul east flank, Isabella Island, Galapagos Islands, Ecuador

Tui De Roy / Galapagos Giant Tortoise (Chelonoidis nigra) group wallowing in seasonal pool on caldera rim, Alcedo Volcano, Isabella Island, Galapagos Islands, Ecuador

Tui De Roy / Volcan Alcedo Giant Tortoise (Chelonoidis nigra vandenburghi) with Galapagos Hawk (Buteo galapagoensis) perched on back, Alcedo Volcano, Isabella Island, Galapagos Islands, Ecuador

Tui De Roy / Galapagos Giant Tortoise (Chelonoidis nigra) group wallowing in seasonal pond on caldera rim, Alcedo Volcano, Isabella Island, Galapagos Islands, Ecuador

Mitsuaki Iwago / Galapagos Giant Tortoise (Chelonoidis nigra) pair and thermal vents, Galapagos Islands, Ecuador