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Petrified sand dunes, White Canyon State Park, Red Cliffs Desert Reserve near St. George, Utah, United States of America
Geology lines in Sandvannet Lake, Nordland County, Norway. The Glomfjord Mountains are visible on the horizon.
Rock formations on Glomfjordfjellet Mountain in Nordland County, Norway.
Perito Moreno glacier, Lago Argentino, Argentina.
Old ice breaking under newer ice when the lake froze, Lake Baikal, Russia.
Person hiking on Matanuska Glacier, Alaska.
Wilhelmina Bay iceberg, Antarctic Peninsula.
Wilhelmina Bay iceberg, Antarctic Peninsula.
Rock formation protruding from the frozen lake, Lake Baikal, Russia.
Perito Moreno glacier ice breaks into the lake, Lago Argentino.
Lake inside a crater, Iceland.
River in a basalt gorge, Iceland.
Inside a frozen cave, Lake Baikal, Russia.
October 19, 2013 - Eruption of Kliuchevskoi (Klyuchevskoy) Volcano, Kamchatka, Russia. Ash and steam cloud are blown away by wind. View over industrial area of Kliuchi town with Kamchatka River in foreground.
October 16, 2013 - Nighttime eruption of Kliuchevskoi (Klyuchevskoy) Volcano, Kamchatka, Russia. Ash cloud and lava flow are produced by the activity of the snowcovered conical stratovolcano. Column of steam rises where lava flow is melting glacier.
October 24, 2013 - Eruption of Kliuchevskoi (Klyuchevskoy) Volcano, Kamchatka, Russia, seen in evening light. Ash cloud is produced by the activity. Kamen volcano is seen on right.
October 21, 2013 - Nighttime view of incandescent rockfall of glowing lava down flank of lava dome of Shiveluch Volcano, Kamchatka, Russia.
February 24, 2013 - Mushroom shaped ash cloud produced by powerful explosive eruption of Sakurajima volcano, Kagoshima, Japan.
February 23, 2013 - Powerful night time explosive eruption of Sakurajima volcano, Japan. Trajectories of glowing incandescent volcanic bombs are visible. Static lightning discharges are visible at top of picture.
December 3, 2012 - Colourful crater lakes of Kelimutu volcano, Flores Island, Indonesia. A crater wall separates Tiwu Nua Muri Koo Fai (Lake of Young Men and Maidens) and Tiwu Ata Polo (Bewitched Lake). The two lakes are highly acidic due to underwater fumarole activity and are turqoise in colour.
December 3, 2012 - Colourful crater lakes of Kelimutu volcano, Flores Island, Indonesia. Tiwu Nua Muri Koo Fai (Lake of Young Men and Maidens) and Tiwu Ata Polo (Bewitched Lake). The two lakes are highly acidic due to underwater fumarole activity and are turqoise in colour.
November 30, 2012 - Glowing Rerombola lava dome of Paluweh (or Rokatenda) volcano during eruption in 2012, Flores, Indonesia.
November 28, 2012 - Explosive strombolian type eruption of Batu Tara volcano, Komba Island, Indonesia. Trajectories of red glowing lava bombs are visible against blue night sky.
November 27, 2012 - Explosive strombolian type eruption of Batu Tara volcano, Komba Island, Indonesia. Trajectories of red glowing lava bombs are visible.
November 26, 2012 - Powerful explosive strombolian type eruption of Batu Tara volcano, Komba Island, Indonesia. Trajectories of red glowing lava bombs are visible.
November 26, 2012 - Explosive strombolian type eruption of Batu Tara volcano, Komba Island, Indonesia. Trajectories of red glowing lava bombs are visible.
November 26, 2012 - Explosive strombolian type eruption of Batu Tara volcano, Komba Island, Indonesia. Trajectories of red glowing lava bombs are visible.
January 24, 2012 - Lava in crater glowing during blue hour on Nyamuragira Volcano, Kimanura Eruption.
January 22, 2012 - Glowing lava in crater illuminating gas cloud above Nyamuragira Volcano, Kimanura Eruption.
September 12, 2009 - Plume Geyser eruption, Upper Geyser Basin geothermal area, Yellowstone Caldera, Yellowstone National Park, Wyoming.
September 12, 2009 - Castle Geyser eruption with rainbow, Upper Geyser Basin geothermal area, Yellowstone Caldera, Yellowstone National Park, Wyoming.
September 12, 2009 - Sawmill Geyser, Upper Geyser Basin geothermal area, Yellowstone Caldera, Yellowstone National Park, Wyoming.
September 12, 2009 - Chromatic Pool Hot Spring, Upper Geyser Basin geothermal area, Yellowstone Caldera, Yellowstone National Park, Wyoming.
September 12, 2009 - Morning Glory Pool Hot Spring, Upper Geyser Basin geothermal area, Yellowstone Caldera, Yellowstone National Park, Wyoming.
September 12, 2009 - Chromatic Pool Hot Spring, Upper Geyser Basin geothermal area, Yellowstone Caldera, Yellowstone National Park, Wyoming.
September 12, 2009 - Steam rising over Midway Geyser Basin geothermal area, Yellowstone Caldera, Yellowstone National Park, Wyoming.
September 12, 2009 - Grand Prismatic Spring, Midway Geyser Basin geothermal area, Yellowstone Caldera, Yellowstone National Park, Wyoming.
September 11, 2009 - White Dome Geyser erupting, Lower Geyser Basin geothermal area, Yellowstone Caldera, Yellowstone National Park, Wyoming.
December 23, 2007 - Lava flow on the flank of Pacaya volcano, Guatemala.
November 2007 - Champagne Pool hot spring, Wai-O-Tapu Geothermal area, Taupo Volcanic Zone, New Zealand.
November 2007 - Orange coloration in Champagne Pool hot spring, Wai-O-Tapu Geothermal area, Taupo Volcanic Zone, New Zealand.
November 2007 - Bubbles rising in Champagne Pool hot spring, Wai-O-Tapu Geothermal area, Taupo Volcanic Zone, New Zealand.
November 2007 - Champagne Pool and Artist's Palette, Wai-O-Tapu Geothermal area, Taupo Volcanic Zone, New Zealand.
November 2007 - Aerial view of 1886 basaltic plinian eruption fissure in rhyolite dome complex, Mount Tarawera volcano, New Zealand.
November 2007 - Aerial view of White Island (Whakaari) volcano with central acidic crater lake, Bay of Plenty, New Zealand.
January 22, 2011 - Lava Lake in bottom of summit caldera, Nyiragongo Volcano, Democratic Republic of the Congo.
January 21, 2011 - Active lava lake in pit crater, Nyiragongo Volcano, Democratic Republic of the Congo.
January 21, 2011 - Nighttime view of lava lake in pit crater, Nyiragongo Volcano, Democratic Republic of the Congo.
January 21, 2011 - Nighttime view of lava lake in pit crater, Nyiragongo Volcano, Democratic Republic of the Congo.
March 1, 2010 - Sabo channel at Haramatsu River with tubular grid dam (slit dam type), for defense and protection against mudflows, with Sakurajima volcano in background, Japan
November 13, 2007 - Moeraki Boulders, round septarian concretions created by cementation of Paleocene mudstone of the Moeraki formation, Koekohe Beach, New Zealand.
November 13, 2007 - Moeraki Boulders, spherical septarian concretions created by cementation of Paleocene mudstone of the Moeraki formation, Koekohe Beach, New Zealand.
Close-up of lava flow, Kilauea volcano, Big Island, Hawaii.
December 11, 2005 - Nighttime eruption of Santiaguito dome complex, Santa Maria volcano, Guatemala.
December 11, 2005 - Eruption of ash cloud from Santiaguito dome complex, Santa Maria volcano, Guatemala.
December 30, 2007 - Lava is flung high in the air during a nighttime eruption of Fuego volcano, Antigua, Guatemala.
November 2006 - Lava flowing from base of hornito during eruption of Mount Etna volcano, Sicily, Italy.
November 2006 - Lava flowing from base of hornito during eruption of Mount Etna volcano, Sicily, Italy.
February 11, 2008 - Dallol geothermal area, egg-shaped fumarole deposits formed in salt deposits of brine hot springs, Danakil Depression, Ethiopia.
February 10, 2008 - Dallol geothermal area, brine hot springs, Danakil Depression, Ethiopia.
January 30, 2011 - Lava lake illuminating walls of pit crater at nightfall, Erta Ale volcano, Danakil Depression, Ethiopia.
January 27, 2011 - Dallol geothermal area, potassium salt deposits formed by brine hot springs, Danakil Depression, Ethiopia.
January 27, 2011 - Dallol geothermal area, potassium salt deposits formed by brine hot springs, Danakil Depression, Ethiopia.
View over Carolafelsen Rocks to Schrammstein Mountains at sunset, Saxony Switzerland National Park, Saxony, Germany, Europe
January 27, 2011 - Dallol geothermal area, terraces, potassium salt deposits formed by brine hot springs, Danakil Depression, Ethiopia.
January 27, 2011 - Dallol geothermal area, potassium salt deposits formed by brine hot springs, Danakil Depression, Ethiopia.
Northern lights over Hvitserkur, a spectacular rock formation in Iceland.
Licancabur stratovolcano reflected in Laguna Tebinquinche, Chile.
Lake Arhuaycocha, Peru.
A shallow cave carved out of a cliff wall below the Blue Mesa in Petrified Forest National Park, Arizona, United States of America, North America
Sunset at Drangarnir, the famous sea stack in Vagar island, Faroe Islands, Denmark, North Atlantic, Europe
Goblin Garden west of Hamilili Point in Petrified Forest National Park, Arizona, United States of America, North America
A rocky shore at low tide and under grey skies; at Welcombe Mouth, Hartland, north Devon, England, United Kingdom, Europe
Panorama of sunset over snow-capped mountain range in the Song Kol lake area of Kyrgyzstan
Views of the abandoned whaling station at Stromness Harbor on South Georgia Island, Southern Ocean
Red Wall cliffs of Roaring Springs Canyon on North Kaibab Trail, Grand Canyon North Rim, UNESCO, Arizona, United States of America
River and moorland, Sutherland, Highlands, Scotland, United Kingdom
Loch Naver, Sutherland, Highland, Scotland, United Kingdom
Looking towards Ben Mor Coigach from Assynt, Sutherland, Highlands, Scotland, United Kingdom
Reflections on Loch Duich, Invershiel, Highlands, Scotland, United Kingdom
Inishbofin island, Connemara, County Galway, Connacht, Republic of Ireland
Inishbofin island, Connemara, County Galway, Connacht, Republic of Ireland
Chalk cliffs, Jasmund National Park, Sassnitz, Rügen Island, Mecklenburg-Western Pomerania, Germany
The granite riverbed of the Agua Fria River Canyon in the Agua Fria National Monument of Arizona.
The granite riverbed of the Agua Fria River Canyon in the Agua Fria National Monument of Arizona.
The granite riverbed of the Agua Fria River Canyon in the Agua Fria National Monument of Arizona.
The granite riverbed of the Agua Fria River Canyon in the Agua Fria National Monument of Arizona.
An ephemeral pool of water in the granite riverbed of the Agua Fria River Canyon in the Agua Fria National Monument of Arizona.
The granite riverbed of the Agua Fria River Canyon in the Agua Fria National Monument of Arizona.
The granite riverbed of the Agua Fria River Canyon in the Agua Fria National Monument of Arizona.
View of Unfinished Obelisk in Aswan quarry on a sunny day, Aswan, Nubia, Egypt, North Africa, Africa
The cliffshide ruins of the engine house of Botallack tin mine, on the Atlantic coast near St Just, Cornwall, Great Britain.
Bennett's Cross, an ancient granite monument, in winter snow, near Warren House, Dartmoor National Park, Devon, Great Britain.
A low tide aerial drone view of the sandy shore and sand banks in the estuary of the River Avon, at Bantham, on the south coast of Devon, Great Britain.
dramatic coastline with rocks of Madeira, Portugal
dramatic coastline with rocks of Madeira, Portugal
dramatic coastline with rocks of Madeira, Portugal
Sandstone rock formation in the Dixie National Forest, Utah, USA. The National Forest was created in 1906.
Popocatepetl Volcano seen from Cholula, Puebla State, Mexico
View from summit of Pico do Areeiro, Madeira