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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

People canoeing near Tham Law (tube cove), Ao Phang-Nga Marine Park, Phang Nga province, Thailand, Southeast Asia, Asia

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

Red rock formations and jangada boat on the seafront of Canoa Quebrada, Canoa Quedrada, Ceara', Brazil, South America

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

The crater on Vulcano, Aeolian Islands, UNESCO World Heritage Site, island of Sicily, Italy, Mediterranean, Europe

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

Coastal sea cliffs and stacks, near Cape Wrath and Sandwood Bay, Highland region, 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

Erosion prevention, contoured bands of trees unfelled, also acting as fire break, Leadville, Colorado, United States of America, North America

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

Third crater from the summit of Irazu, highest in Costa Rica at 3432m, last erupted 1994, Parque Nacional Volcan Irazu, Cartago, Costa Rica, Central America

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

Lava flow, Kilauea, Hawaii Volcanoes National Park, UNESCO World Heritage Site, Island of Hawaii (Big Island), Hawaii, United States of America, North America

Zodiac cruises through a natural arch of columnar basalt on the southern coast of Disko Island, Kuannersuit, Greenland, Polar Regions

Plumes of steam where the lava reaches the sea, Kilauea Volcano, Hawaii Volcanoes National Park, UNESCO World Heritage Site, Island of Hawaii (Big Island), Hawaii, United States of America, Pacific, North America

Skylight, view through cooled lava to molten lava below, Kilauea Volcano, Hawaii Volcanoes National Park, Island of Hawaii (Big Island', Hawaii, United States of America, North America

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

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

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

Hiking trail and rocky peaks on Cradle Mountain on the Overland Track, Cradle Mountain Lake St. Clair National Park, part of Tasmanian Wilderness, UNESCO World Heritage Site, Tasmania, Australia, Pacific

Hikers near Emerald Lakes on the Tongariro Crossing, Tongariro National Park, UNESCO World Heritage Site, the oldest national park in New Zealand, Taupo Volcanic Zone, North Island, New Zealand, Pacific

Hikers near Emerald Lakes on the Tongariro Crossing, Tongariro National Park, UNESCO World Heritage Site, the oldest national park in New Zealand, Taupo Volcanic Zone, North Island, New Zealand, Pacific

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

Limestone plateau, karstic landscape, Burren region, County Clare, Munster, Republic of Ireland, Europe

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

Basaltic cliffs dominating Raasay Sound, east coast of Skye, Trotternish, Isle of Skye, Inner Hebrides, Scotland, United Kingdom, Europe