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.

Sergey Gorshkov / Tolbachik Volcano erupting, Kamchatka, Russia

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

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.

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 / Rhiolite mountains at Landmannalaugar. Rhyiolite volcanism. 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

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

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

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

Tim Fitzharris / Castle Geyser, Yellowstone National Park, Wyoming

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

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 / 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

Tui De Roy / Marine Iguana (Amblyrhynchus cristatus) with lava flow entering sea at night, Cape Hammond, Fernandina Island, Galapagos Islands, Ecuador

Flip Nicklin / Sperm Whale (Physeter macrocephalus) entangled in net, Sri Lanka

Tui De Roy / Mt Ruapehu eruption 1996, highest volcano on North Island, Ohakune, Tongariro National Park, New Zealand

Tui De Roy / Tungurahua Volcano erupting, near Banos, Andes Mountains, Ecuador

Mitsuaki Iwago / Hot lava entering the ocean with resulting steam plumes, Galapagos Islands, Ecuador

Juergen Freund / Siau volcano erupting with moon behind, N Sulawesi, Indonesia

Sergey Gorshkov / Tolbachik Volcano erupting, Kamchatka, Russia

Tim Fitzharris / Old Faithful geyser spouting, Yellowstone National Park, Wyoming

Sergey Gorshkov / Eruption of Tolbachik Volcano, Kamchatka, Russia

Sergey Gorshkov / Lava flow burning forest, Tolbachik Volcano, Kamchatka, Russia

Sergey Gorshkov / Lava flow burning forest, Tolbachik Volcano, Kamchatka, Russia

Sergey Gorshkov / Eruption of Tolbachik Volcano, Kamchatka, Russia

Sergey Gorshkov / Eruption of Tolbachik Volcano, Kamchatka, Russia

Sergey Gorshkov / Eruption of Tolbachik Volcano, Kamchatka, Russia

Sergey Gorshkov / Eruption of Tolbachik Volcano, Kamchatka, Russia

Sergey Gorshkov / Eruption of Tolbachik Volcano, Kamchatka, Russia

Sergey Gorshkov / Lava flow, Tolbachik Volcano, Kamchatka, Russia

Sergey Gorshkov / Eruption of Tolbachik Volcano, Kamchatka, Russia

Sergey Gorshkov / Lava flow, Tolbachik Volcano, Kamchatka, Russia

Sergey Gorshkov / Eruption of Tolbachik Volcano, Kamchatka, Russia

Sergey Gorshkov / Eruption of Tolbachik Volcano, Kamchatka, Russia

Sergey Gorshkov / Lava flow, Tolbachik Volcano, Kamchatka, Russia

Sergey Gorshkov / Lava flow burning forest, Tolbachik Volcano, Kamchatka, Russia

Erlend Haarberg / Fumarole at sunrise at the Hverir, Iceland, July 2008

Erlend Haarberg / Solidified lava surface from previous volcanic activity, Leirhnjukur, Iceland, June 2008

Colin Monteath / Snow-covered volcano showing caldera, Andes, Chile

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

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

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

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

Norbert Wu / Lava and mud flow frozen on barren volcanic crater, Socorro Island, Revillagigedos Islands, Mexico

Piotr Naskrecki / Cycad (Cycas sp) immature female cone, South Africa

Piotr Naskrecki / Water Horsetail (Equisetum fluviatile) stem and cone, Estabrook Woods, Massachusetts

Kevin Schafer / Aerial view of Mount St Helens crater with Mount Adams behind, Mount St Helens National Volcanic Monument, Washington

Kevin Schafer / Aerial view of Mount St Helens crater with Mount Hood behind, Mount St Helens National Volcanic Monument, Washington

Kevin Schafer / Aerial view of Mount St Helens crater with Mount Rainier behind, Mount St Helens National Volcanic Monument, Washington

Kevin Schafer / Aerial view of Mount St Helens crater with Mt Adams and Hood behind, Mount St Helens National Volcanic Monument, Washington

Kevin Schafer / Aerial view of crater rim on south slope of Mount St Helens, Mount St Helens National Volcanic Monument, Washington

Kevin Schafer / Aerial view of steam rising from lava inside crater, Mount St Helens National Volcanic Monument, Washington

Kevin Schafer / Lava tube and person in Ape Cave, Mount St Helens Volcano National Monument, Washington

Konrad Wothe / Norway Spruce (Picea abies) cones in spring, Germany

Kevin Schafer / Torrey Pine (Pinus torreyana) cone, Santa Rosa Island, Channel Islands National Park, California

Pete Oxford / Galapagos Fur Seal (Arctocephalus galapagoensis) male on cool lava, Cape Hammond, Fernandina Island, Galapagos Islands, Ecuador

Pete Oxford / Galapagos Sea Lion (Zalophus wollebaeki) on cooled lava, Floreana Island, Galapagos Islands, Ecuador

Steve Gettle / White-winged Crossbill (Loxia leucoptera) male feeding, Michigan

Gerry Ellis / Albany Cycad (Encephalartos latifrons) cone, Kirstenbosch Garden, South Africa

Gerry Ellis / Ama'u Fern (Sadleria sp) in lava field, Hawaii Volcanoes National Park, Hawaii

Rob Brown / Mount Ngauruhoe and Mount Ruapehu, Tongariro National Park, New Zealand

Tui De Roy / Galapagos Lava Lizard (Microlophus albemarlensis) young male lifting toes to avoid overheating on hot lava, Galapagos Islands, Ecuador

Tui De Roy / Galapagos Land Iguana (Conolophus subcristatus) on caldera rim, Galapagos Islands, Ecuador

Tui De Roy / Volcan Alcedo Giant Tortoise (Chelonoidis nigra vandenburghi) searching for water around steaming fumaroles during prolonged dry season, Isabella Island, Galapagos Islands, Ecuador

Tui De Roy / Volcan Alcedo Giant Tortoise (Chelonoidis nigra vandenburghi) near fumarole, Isabella Island, Galapagos Islands, Ecuador

Tui De Roy / Volcan Alcedo Giant Tortoise (Chelonoidis nigra vandenburghi) male on caldera floor, Isabella Island, Galapagos Islands, Ecuador

Tui De Roy / Volcan Alcedo Giant Tortoise (Chelonoidis nigra vandenburghi) male with steaming fumaroles on caldera floor, Isabella Island, Galapagos Islands, Ecuador

Tui De Roy / Volcan Alcedo Giant Tortoise (Chelonoidis nigra vandenburghi) male walking past steaming fumaroles on caldera, Isabella Island, Galapagos Islands, Ecuador

Tui De Roy / Volcan Alcedo Giant Tortoise (Chelonoidis nigra vandenburghi) male walking past steaming fumaroles in caldera, Isabella Island, Galapagos Islands, Ecuador

Tui De Roy / Volcan Alcedo Giant Tortoise (Chelonoidis nigra vandenburghi) wallowing in fast drying rain pool on caldera floor, Isabella Island, Galapagos Islands, Ecuador

Tui De Roy / Volcan Alcedo Giant Tortoise (Chelonoidis nigra vandenburghi) group wallowing in rain pool on caldera floor, Isabella Island, Galapagos Islands, Ecuador

Tui De Roy / Volcan Alcedo Giant Tortoise (Chelonoidis nigra vandenburghi) group wallowing in rain pool on caldera floor, Isabella Island, Galapagos Islands, Ecuador