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October 21, 2013 - Nighttime view of incandescent rockfall of glowing lava down flank of lava dome of Shiveluch Volcano, Kamchatka, Russia.
October 16, 2013 - Eruption of Kliuchevskoi (Klyuchevskoy) Volcano, Kamchatka, Russia. Ash cloud and lava flow are produced by the volcano which is partially shrouded in cloud. Kamen volcano is seen on right.
October 16, 2013 - Nighttime eruption of Kliuchevskoi (Klyuchevskoy) Volcano, Kamchatka, Russia. Ash cloud and lava flow are produced by the activity of the volcano which is partially shrouded in cloud. Kamen volcano is seen on right.
October 21, 2013 - Nighttime moonlit view of incandescent rockfall of glowing lava down flank of lava dome of Shiveluch Volcano, Kamchatka, Russia.
December 3, 2012 - Colourful crater lakes of Kelimutu volcano, Flores Island, Indonesia. Tiwu Nua Muri Kofah (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. 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.
January 24, 2012 - Scoria cone on Nyamuragira Volcano, Democratic Republic of Congo.
January 24, 2012 - Yellow sulphurous deposits resulting from degassing coating scoria cone formed during eruption on Nyamuragira Volcano, Democratic Republic of Congo.
February 10, 2008 - Dallol geothermal area, brine hot springs, 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.
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.
January 27, 2011 - Dallol geothermal area, potassium salt deposits formed by brine hot springs, Danakil Depression, Ethiopia.
January 27, 2011 - Dallol geothermal area, terraces, potassium salt deposits formed by brine hot springs, Danakil Depression, Ethiopia.
January 27, 2011 - Dallol geothermal area, terraces of 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.
January 27, 2011 - Dallol geothermal area, potassium salt deposits formed by brine hot springs, Danakil Depression, Ethiopia.
Iceberg swimming pool, Antarctica.
Levada (aqueduct) on the heights of Machico, Madeira island, Atlantic Ocean, Portugal
Hiker on ancient path used by villagers to cross the island North to South, on the heights of Santana, Madeira island, Atlantic Ocean, Portugal
Hiker on path along levada (aqueduct) of Green Cauldron (Caldeirao Verde), Madeira island, Atlantic Ocean, Portugal
Waterfall in Green Cauldron (Caldeirao Verde), Madeira island, Atlantic Ocean, Portugal
Hikers on a path along levada (aqueduct) of Green Cauldron (Caldeirao Verde), Madeira island, Atlantic Ocean, Portugal
25 Fountains cirque, Rabacal, Madeira island, Atlantic Ocean, Portugal
Tunnel, Funchal, Madeira island, Atlantic Ocean, Portugal
Nothern lights over Lake Myvatn geothermal area, Iceland.
Path along a levada, Prazeres, Madeira island, Atlantic Ocean, Portugal
Trail from Prazeres to Paul do Mar, Madeira island, Atlantic Ocean, Portugal
Hiking trail from Prazeres to Paul do Mar, Madeira island, Atlantic Ocean, Portugal
Path on side of cliff toward Paul do Mar, Madeira island, Atlantic Ocean, Portugal
Hikers along Abra Bay, Sao Lourenco peninsula, Madeira island, Atlantic Ocean, Portugal
Sidestepping path on the Sao Lourenco peninsula, Madeira island, Atlantic Ocean, Portugal
Abra Bay, Sao Lourenco peninsula, Madeira island, Atlantic Ocean, Portugal
Abra Bay, Sao Lourenco peninsula, Madeira island, Atlantic Ocean, Portugal
Abra Bay, Sao Lourenco peninsula, Madeira island, Atlantic Ocean, Portugal
Levada (aqueduct) on the heights of Machico, Madeira island, Atlantic Ocean, Portugal
House on the heights of Machico, Madeira island, Atlantic Ocean, Portugal
Eira do Serrado site above village Curral das Freiras (Nuns valley), Madeira island, Atlantic Ocean, Portugal
Snowdonia National Park (Eryri), Wales, United Kingdom
The east cliffs of Blue Mesa near sunset, Petrified Forest National Park, Arizona, United States of America, North America
Goblin Garden west of Hamilili Point in Petrified Forest National Park, Arizona, United States of America, North America
Sunset over hilly landscape in front of the Snowy Sierra Nevada, Albaicin, Granada, Andalucia, Spain
Sunset over arid hilly landscape in front of the snowy Sierra Nevada, Albaicin, Granada, Andalucia, Spain
Sunset above Granada looking north to Cartuja with the mountains of Parque Natural Sierra de Huetor, Granada, Andalucia, Spain
Mirador de los 4 Postes, Avila, UNESCO, Castilla y Leon, Spain
Southern elephant seal (Mirounga leonina) mating behavior on South Georgia Island, Southern Ocean
Greenland Lake reduced to a mud hole, Grand Canyon North Rim, UNESCO, Arizona, United States of America
Greenland Lake reduced to a mud hole, Grand Canyon North Rim, UNESCO, Arizona, United States of America
Angochagua, Imbabura Province, Ecuador
Landscape in Angochagua Parochia, Imbabura Province, Ecuador
A view of the snow-capped mountains surrounding Song Kol Lake at sunrise, Kyrgyzstan
An aerial view of the Song Kol lake area at sunrise, Kyrgyzstan
An aerial view of the Song Kol lake area at sunrise, Kyrgyzstan
An aerial view of Son Kol lake area, with meandering river, yurts and camp at sunrise, Kyrgyzstan
Highway US89A looking east to Vermilion Cliffs National Monument with Kaibab National Forest boundary sign, Arizona, United States of America
Shag Rocks, Scotia Sea, South Atlantic Ocean
Very remote Shag Rocks, near South Georgia Island in the Scotia Sea, South Atlantic Ocean
The west entrance of Supai Tunnel on North Kaibab Trail, Grand Canyon North Rim, UNESCO, Arizona, United States of America
The Red Wall of sandstone east of Supai Tunnel on North Kaibab Trail, Grand Canyon North Rim, UNESCO, Arizona, United States of America
Red Wall cliffs of Roaring Springs Canyon on North Kaibab Trail, Grand Canyon North Rim, UNESCO, Arizona, United States of America
Ephemeral Spring on Red Wall of Roaring Springs Canyon, North Kaibab Trail, Grand Canyon North Rim, UNESCO, Arizona, United States of America
View of Roaring Springs Canyon along the North Kaibab Trail at Grand Canyon North Rim, UNESCO, Arizona, United States of America
View of the Roaring Springs Canyon cliffs from the Red Wall Bridge, Grand Canyon North Rim, UNESCO, Arizona, United States of America
The Coconino Overlook along the North Kaibab Trail at Grand Canyon North Rim, UNESCO, Arizona, United States of America
The 11th switchback along the North Kaibab Trail at Grand Canyon North Rim, UNESCO, Arizona, United States of America
The 17th switchback along the North Kaibab Trail at Grand Canyon North Rim, UNESCO, Arizona, United States of America
The 20th switchback along the North Kaibab Trail at Grand Canyon North Rim, UNESCO, Arizona, United States of America
The interior of the Supai Tunnel along the North Kaibab Trail, Grand Canyon North Rim, UNESCO, Arizona, United States of America
Tree in autumn, Loch Naver, Sutherland, Highland, Scotland, United Kingdom
Looking towards Ben Mor Coigach from Assynt, Sutherland, Highlands, Scotland, United Kingdom
Stac Pollaidh, Assynt, Sutherland, Highlands, Scotland, United Kingdom
Dog, Zumbahua, Cotopaxi Province, Ecuador
View of colourful buildings and red rooftops at dusk in the Alfama District, Lisbon, Portugal, Europe
Panoramic views of Santa Cruz de Tenerife is a port city on the island of Tenerife, in Spain���s Canary Islands
Misty landscape of Mount Jianglang, Jiangshan City, Zhejiang Province, China
Gap between two peaks of Mount Jianglang, Jiangshan City, Zhejiang Province, China
Mount Jianglang, Jiangshan City, Zhejiang Province, China
Mount Jianglang, Jiangshan City, Zhejiang Province, China
View of vintage Glória Funicular, hilltop tram ride, Lisbon, Portugal, Europe
Women carrying basket on their head walking on a laterite track, Benin, Gulf of Guinea, West Africa
Bird petroglyph, Petrified Forest National Park, Arizona, United States of America, North America
View of Luxor Temple during golden hour, Luxor, Egypt, Africa
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.
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.
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.
The granite riverbed of the Agua Fria River Canyon in the Agua Fria National Monument of Arizona.
Entrance to the Badger Springs Trailhead in the Agua Fria National Monument of Arizona.
Badger Springs Creek Canyon in the Agua Fria National Monument of Arizona.