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Diver looks on at sponges, pink soft corals and crinoids in a colorful Komodo seascape, Komodo National Park, Indonesia.

Diver looks on at sponges, soft corals and crinoids in a colorful Komodo seascape, Komodo National Park, Indonesia.

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 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.

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.

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 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, potassium salt deposits formed by brine hot springs, Danakil Depression, Ethiopia.

Diver enters the cavern system at Chac Mool cenote in the Riviera Maya area of Mexico's Yucatan Peninsula.

Scuba diver in the Garden of Eden cavern part of the cenote system on the Yucatan Peninsula of Mexico.

Pluri-centenarian laurel trees around Fanal, Paul da Serra plateau, Madeira island, Atlantic Ocean, Portugal

Bigeye Trevally (Caranx sexfasciatus), schooling in Cabo Pulmo National Marine Park, Baja California Sur, Mexico, North America

Thomas Telford's Menai Suspension Bridge crossing the Strait, Anglesey island, Wales, United Kingdom

Southern elephant seal (Mirounga leonina) pup, called weaners once their mothers stop nursing them, South Georgia Island, Southern Ocean

A sloping red sand dune above Hamilili Wash 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

A rocky shore at low tide and under grey skies; at Welcombe Mouth, Hartland, north Devon, England, United Kingdom, Europe

Aspen trees in autumn colors east of Greenland Lake, Grand Canyon North Rim, Arizona, United States of America

Looking back up the first leg of 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

Panoramic view of iron ore mine Cockerill d'Esch-sur-Alzette that played a major role in economic boom from the 1870s to the 1990s, Luxembourg

View of vintage tram and colourful buildings in the Alfama District on a sunny day, Lisbon, Portugal, Europe

Panoramic view of Lisbon Castle from Miradouro da Senhora do Monte scenic point at dusk in the Alfama District, Lisbon, Portugal, Europe

View of Lisbon and fountain in Miradouro de Sao Pedro de Alcantara at dusk, Lisbon, Portugal, Europe

A view from Victoria Peak, looking north over Central district, the harbour and Kowloon,Hong-Kong Island,People's Republic of China,Asia

Villagers moving by sailing pirogue on Ganvie lake village in Lake Nokoué, near Cotonou, Gulf of Guinea, West Africa

Woman walking carrying basket on her head, Mono River bank in Grand-Popo area, Benin,Gulf of Guinea,West Africa

Villagers moving by pirogue on Ganvie lake village in Lake Nokoué, near Cotonou, Gulf of Guinea, West Africa

Fortified house, known as Tata Somba ('Somba house') in a Tammari (also known as Batammariba, Tamberma, Somba, Otamari) village, Atakora department, Benin, Gulf of Guinea, West Africa

Taneka (or Tanewa, Tangba, Tongba) village, near Djougou, Donga department , Benin, Gulf of Guinea, West Africa

Taneka (or Tanewa, Tangba, Tongba) village, near Djougou, Donga department , Benin, Gulf of Guinea, West Africa

Tammari (also known as Batammariba, Tamberma, Somba, Otamari) man coming out of a granary on the roof his fortified house, known as Tata Somba ('Somba house'), Atakora department, Benin, Gulf of Guinea, West Africa