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The deep gorge of the Colorado River on the west rim of the Grand Canyon, UNESCO World Heritage Site, Arizona, United States of America, North America

Giants Causeway, UNESCO World Heritage Site, County Antrim, Ulster, Northern Ireland, United Kingdom, Europe

Roadside building dwarfed by the Athabasca Glacier in the Jasper National Park, UNESCO World Heritage Site, Alberta, Canada, North America

Ayers Rock, Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific

Pinnacles and rock formations known as The Silent City, seen from Inspiration Point, with snow on the ground, in the Bryce Canyon National Park, Utah, United States of America, North America

Pinnacles and rock formations caused by erosion and known as The Silent City, seen from Inspiration Point, in the Bryce Canyon National Park, Utah, United States of America, North America

Landscape of rice paddies, fish farms and limestone pinnacles in the Fenglin Karst south of Guilin, Yangshuo, Guangxi, China, Asia

Rock formations caused by erosion, and a solitary pine tree above the Queens Garden, in the Bryce Canyon National Park, in Utah, United States of America, North America

Lava flow from the Monti Calcarazzi fissure on the flank of Mount Etna in 2001 which threatened Nicolosi below, Sicily, Italy, Europe

The Chocolate Hills, a famous geological curiosity, with over 1000 of them, on the island of Bohol, the Philippines, Southeast Asia, Asia

Yellow school bus, for students on geology field trip, Waterton Glacier International Peace Park, Rocky Mountains, Montana, United States of America, North America

Tiny figures show scale of the Deer cave looking back to mouth of the Deer cave, Mulu National Park, Sarawak, island of Borneo, Malaysia, Southeast Asia, Asia

The perfect cone of Volcan Concepcion, 1610m, one of two volcanoes that make up the island of Omotepe, Nicaragua, Central America

Eruption of highly active Volcan Pacaya, a popular tourist sight south of Guatemala City, Guatemala, Central America

Eruption of highly active Volcan Pacaya, a popular tourist sight south of Guatemala City, Guatemala, Central America

Eruption of highly active Volcan Pacaya, a popular tourist sight south of Guatemala City, Guatemala, Central America

Spectacular limestone outcrops and forested valleys of Zhangjiajie Forest Park in Wulingyuan Scenic Area in Hunan Province, UNESCO World Heritage Site, China, Asia

The Grand Canyon at sunset from the South Rim, UNESCO World Heritage Site, Arizona, United States of America, North America

The Chocolate Hills of Bohol, famous geological curiosity, of which there are over 1000, Bohol, Philippines, Southeast Asia, Asia

Glacial sediment causes blue colour in Lake Tekapo, mountains of the Southern Alps behind, Canterbury, South Island, New Zealand, Pacific

Route from Andalsnes to Geiranger, Trollstigen Road, Western Fiordlands, Norway, Scandinavia, Europe

Looking out through entrance of cave, Deer Cave, Gunung Mulu National Park, UNESCO World Heritage Site, Sarawak, island of Borneo, Malaysia, Southeast Asia, Asia

Sinkhole Plain, polygonal doline karst, near Mammoth Cave, Kentucky, United States of America, North America

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

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 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

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