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Part of the North Unit of Badlands National Park, carved out of the prairies by rapid water erosion of sediments, South Dakota, United States of America, North America

Laguna Verde with mineral flat margin and Volcan Licancabur, 5960m, Southwest Highlands, Bolivia, South America

Tufa towers at Lac Abhe (Abbe), formed by hot springs beneath old lake at higher level, Afar Triangle, Djibouti, Africa

Smoke billowing out from volcano vent, Sulphur Lake, Kawah Ijen, Ijen Plateau, island of Java, Indonesia, Southeast Asia, Asia

Tourists trekking, Sulphur Lake, Kawah Ijen, Ijen Plateau, island of Java, Indonesia, Southeast Asia, Asia

Rock formation called 'the finger of Allah', Akakus, Sahara desert, Fezzan, Libya, North Africa, Africa

Wave-cut platform, and chalk cliffs, Flamborough South Landing, Yorkshire, England, United Kingdom, Europe

Natural spring, Pamukkale, UNESCO World Heritage Site, Egee region, Anatolia, Turkey, Asia Minor, Asia

Aerial view of La Graciosa Island volcanoes from El Mirador del Rio, Lanzarote, Canary Islands, Spain, Atlantic, Europe

Aerial view of the sandy dunes and lagoons, part of Parque Nacional dos Lencois Maranhenses, Brazil, South America

Aerial view of the sandy dunes and lagoons, part of Parque Nacional dos Lencois Maranhenses, Brazil, South America

One of three crater lakes at the summit of Kelimutu volcano near Moni, soil chemical creates the unusual colours, island of Flores, Indonesia, Southeast Asia, Asia

View east along crater rim from Orongo ceremonial village of the Rano Kau crater, Easter Island, Chile, Pacific, South America

Entrance to Fingal's Cave, columnar basalt rock, Island of Staffa, Argyllshire, Inner Hebrides, Scotland, United Kingdom, Europe

The Pu'u O'o cinder cone, the active vent on the southern flank of the Kilauea volcano, UNESCO World Heritage Site, Big Island, Hawaiian Islands, United States of America, North America

The Pu'u O'o cinder cone, the active vent on the southern flank of the Kilauea volcano, UNESCO World Heritage Site, Big Island, Hawaiian Islands, United States of America, North America

One of the crater lakes at Band-E-Amir (Dam of the King), Afghanistan's first National Park set up in 1973 to protect the five lakes, believed by locals to have been created by the Prophet Mohammed's son-in-law Ali, making them a place of pilgrimage, Afghanistan, Asia

Band-i-Zulfiqar, the main lake at Band-E-Amir (Dam of the King), Afghanistan's first National Park set up in 1973 to protect the five lakes, believed by locals to have been created by the Prophet Mohammed's son-in-law Ali, making them a place of pilgrimage, Afghanistan, Asia

Band-i-Zulfiqar, the main lake at Band-E-Amir (Dam of the King), Afghanistan's first National Park set up in 1973 to protect the five lakes, believed by locals to have been created by the Prophet Mohammed's son-in-law Ali, making them a place of pilgrimage, Afghanistan, Asia

Band-i-Zulfiqar, the main lake at Band-E-Amir (Dam of the King), Afghanistan's first National Park set up in 1973 to protect the five lakes, believed by locals to have been created by the Prophet Mohammed's son-in-law Ali, making them a place of pilgrimage, Afghanistan, Asia

Band-i-Zulfiqar, the main lake at Band-E-Amir (Dam of the King), Afghanistan's first National Park set up in 1973 to protect the five lakes, believed by locals to have been created by the Prophet Mohammed's son-in-law Ali, making them a place of pilgrimage, Afghanistan, Asia

Folded limestone and shale, Jurassic period, Stair Hole, Lulworth, Dorset, England, United Kingdom, Europe

Ogygiopsis klotzi, fossil, trilobite 50mm long with small fault through it, Cambrian, Burgess Shale, Yoho, Canada, North America

Sedimentary rocks, clay, colour banded by iron oxides, horizontal Triassic Chinle Clay, Blue Mesa, Painted Desert, Arizona, United States of America, North America

Migrating barchan sand dunes across road marked by buried telegraph poles, Kharga basin, Western Desert, Egypt, North Africa, Africa

The world's finest travertine dams, Huanglong (Yellow Dragon), UNESCO World Heritage Site, northern Sichuan, Sichuan, China, Asia

Aerial view of the Iguassu Falls, Iguassu National Park, UNESCO World Heritage Site, Parana, Brazil, South America

The Giants Causeway, UNESCO World Heritage Site, Co. Antrim, Ulster, Northern Ireland, United Kingdom, Europe

The Giants Causeway, UNESCO World Heritage Site, Co. Antrim, Ulster, Northern Ireland, United Kingdom, Europe

Steam issuing from sulphurous fumarole at Gran Craters, Vulcano Island, with islands of Lipari and Salina beyond, Aeolian Islands (Eolian Islands) (Lipari Islands), UNESCO World Heritage Site, Sicily, Italy, Mediterranean, Europe

Band-I-Zulfiqar the main lake, Band-E- Amir (Bandi-Amir) (Dam of the King) crater lakes, Afghanistan's first National Park, Bamian province, Afghanistan, Asia

Tourists inspecting the large halite salt crystal formations, Devils Golf Course, Death Valley National Park, California, United States of America, North America

Lagoa Azul (Blue Lagoon) and sand dunes, Parque Nacional dos Lencois Maranhenses, Brazil, South America

View of Koh Ping-gan from Koh Ta Poo, known as James Bond island, Phang-Nga Bay, Thailand, Southeast Asia, Asia

Manjanggul longest lava tube system in the world on the island of Jejudo, UNESCO World Heritage Site, South Korea, Asia

Limestone pavements near Chapel-le-Dale, Yorkshire Dales, National Park, Yorkshire, England, United Kingdom, Europe

Limestone pavements near Chapel-le-Dale, Yorkshire Dales, National Park, Yorkshire, England, United Kingdom, Europe

Buttertubs potholes, karstic erosion at Buttertubs Pass, between Wensleydale and Swaledale, Yorkshire Dales National Park, Yorkshire, England, United Kingdom, Europe

Buttertubs potholes, karstic erosion at Buttertubs Pass, between Wensleydale and Swaledale, Yorkshire Dales National Park, Yorkshire, England, United Kingdom, Europe

Norber erratics near Austwick, erratic boulders left on limestone pavement by erosion, Yorkshire Dales National Park, Yorkshire, England, United Kingdom, Europe

Limestone pavements near Chapel-le-Dale, Yorkshire Dales National Park, Yorkshire, England, United Kingdom, Europe

Slieve League, the highest cliffs in Europe, Bunglass Point, County Donegal, Ulster, Republic of Ireland (Eire), Europe

Close-up of pitch at the world's largest natural pitch lake, 90 meters deep, Trinidad, West Indies, Caribbean, Central America

Water cascading off Rob Roy Glacier, Mount Aspiring National Park, Otago, South Island, New Zealand, Pacific

Mount Mayon, 2462 m, near-perfect volcano cone with plume of smoke reflected in rice field, Bicol Province, southeast Luzon, Philippines, Southeast Asia, Asia

Mount Mayon, 2462 m, near-perfect volcano cone with plume of smoke, Bicol Province, southeast Luzon, Philippines, Southeast Asia, Asia

Early morning light on corrugated badlands landscape at Zabriskie Point, Death Valley National Park, California, United States of America, North America

Lewisian gneiss, one of the oldest rocks on earth formed 2 billion years ago, Isle of Lewis, Outer Hebrides, Scotland, United Kingdom, Europe

Slopes of the Quiraing, a geological wonder, its distinctive features resulting from landslips of basalt lavas upon softer sedimentary rocks beneath, northeast coast of Trotternish Peninsula, Isle of Skye, Inner Hebrides, Scotland, United Kingdom, Europe

The Quiraing escarpment (The Table) ( The Prison), overlooking the Sound of Raasay, Trotternish, Isle of Skye, Inner Hebrides, Scotland, United Kingdom, Europe

Slopes of the Quiraing, a geological wonder, its distinctive features resulting from landslips of basalt lavas upon softer sedimentary rocks beneath, northeast coast of Trotternish Peninsula, Isle of Skye, Inner Hebrides, Scotland, United Kingdom, Europe

Landscape typical of the region, with cypress trees and spectacular landslides called locally balze, Volterra, Tuscany, Italy, Europe

Limestone pavement at Lea Green, Grassington, Yorkshire Dales National Park, North Yorkshire, England, United Kingdom, Europe

Lac Assal, the lowest point on the African continent and the most saline body of water on earth, Djibouti, Africa

Lac Assal, the lowest point on the African continent and the most saline body of water on earth, Djibouti, Africa

Lac Assal, the lowest point on the African continent and the most saline body of water on earth, Djibouti, Africa

Lac Assal, the lowest point on the African continent and the most saline body of water on earth, Djibouti, Africa

Uluru (Ayers Rock), Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, with the Olgas in the distance, Northern Territory, Australia, Pacific