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Hole in the Wall, Coffee Bay, Transkei, Wild Coast, South Africa, Africa
Rock tombs in sandstone inselberg, Mada'in Salih, Saudi Arabia, Middle East
Landscape of the Yellow River, farm land and hills in Qinghai, China, Asia
Yangzi Tiger Leaping Gorge in Yunnan, China, Asia
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
Spitzkoppe, 1728m, between Windhoek and Shakapmund, Damaraland, Namibia, Africa
Aerial view of Victoria Falls, Zimbabwe, Africa
Rock formations of The Burren, County Clare, Munster, Republic of Ireland, Europe
Ochre quarries at Roussillon, Provence, France, Europe
The Morning Glory Pool, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, 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
Cheddar Gorge tourist attraction, limestone rock formations, Somerset, England, United Kingdom, Europe
Interior of the Gruta do Janelao, a limestone cave passage 100m high, lit through roof window, at Peruacu in Minas Gerais state, Brazil, South America
The Morning Glory Pool, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Late winter hikers on Tongariro crossing, Mount Ngauruhoe and South Crater, Taupo, Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific
Isolated chalk towers, remnants of karst, Farafra Oasis, White Desert, Western Desert, Egypt, North Africa, Africa
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
Tools for polishing gemstones in Borneo, Southeast Asia, Asia
Wind eroded pinnacle rock showing strata, Tamegaout, Algeria, North Africa, Africa
The Old Faithful Geyser at Calistoga, erupts 60 ft high every 30 minutes, with a pressure of 1000 lbs per square foot, Napa Valley, California, United States of America, North America
Briksdal's Glacier flowing into Nordfjord, Norway, Scandinavia, Europe
Eruptions at the Monti Calcarazzi fissure and the Piano del Lago cone on Mount Etna, that threatened tourist facilities and village in 2001, Sicily, Italy, Europe
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
Detail from the dramatic landscape of the Painted Hills, where rapid erosion has shaped colourful mineral-rich clays, John Day Fossil Beds National Monument, Oregon, United States of America, North America
Kaietur Falls, Guyana, South 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
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
Bubbling mud pot in the Whakarewarewa thermal area at Rotorua, South Auckland, North Island, New Zealand, Pacific
Llamas grazing before Volcanoes Parinacota and Pomerape, Lauca National Park, Chile, South America
Dona Ana beach, Lagos, Western Algarve, Algarve, Portugal, Europe
Desert landscape with rock formations in Monument Valley, Arizona, United States of America, North America
Desert landscape with rock formations in Monument Valley, Arizona, United States of America, North America
Karakoram mountain range and the massif of the Hindu Kush, in northern area, Pakistan, Asia
Garibaldi Glacier, Darwin National Park, Tierra del Fuego, Patagonia, Chile, South America
Salt Lake, Chott el Jerid, Tunisia, North Africa, Africa
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
The Chocolate Hills of Bohol, famous geological curiosity, of which there are over 1000, Bohol, Philippines, Southeast Asia, Asia
Castle Geyser, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America (U.S.A.), North America
Thermal activity, Karapiti area, Taupo, South Auckland, North Island, New Zealand, Pacific
View from limestone pavement across the Jamison Valley in the Blue Mountains National Park where the blue haze is caused by eucalyptus oil, near Katoomba, UNESCO World Heritage Site, New South Wales (N.S.W.), Australia, Pacific
Glacial sediment causes blue colour in Lake Tekapo, mountains of the Southern Alps behind, Canterbury, South Island, New Zealand, Pacific
Vulcan's Throne, the west rim, above the Colorado River, Grand Canyon, UNESCO World Heritage Site, Arizona, United States of America (USA), North America
Perfect example of strato-volcano, island cone left by subsidence, Crater Lake, Oregon, United States of America (U.S.A.), North America
Route from Andalsnes to Geiranger, Trollstigen Road, Western Fiordlands, Norway, Scandinavia, Europe
Old Faithful Geyser, erupts 60ft every 30 minutes, with pressure of 1000lbs per square foot, Napa Valley, California, United States of America (USA), North America
Looking out through entrance of cave, Deer Cave, Gunung Mulu National Park, UNESCO World Heritage Site, Sarawak, island of Borneo, Malaysia, Southeast Asia, Asia
Beach, white chalk cliffs, stacks and arches, Whitianga, Coromandel Peninsula, South Auckland, North Island, New Zealand, Pacific
Champagne Pools steaming, Waiotapu thermal reserves, Rotorua, South Auckland, North Island, New Zealand, Pacific
Champagne Pools steaming, Waiotapu thermal reserve, Rotorua, South Auckland, North Island, New Zealand, Pacific
Cathedral Cove, Coromandel Peninsula, South Auckland, North Island, New Zealand, Pacific
Remarkable Rocks, Flinders Chase National Park, Kangaroo Island, South Australia, Australia, Pacific
Part of Nourlangie Rock, sacred aboriginal shelter and rock art site, Kakadu National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific
Rock arches, Beirut, Lebanon, Mediterranean Sea, Middle East
Frank Slide, where giant rockfall occurred in 1903, limestone debris fell 400m, Alberta, Canada, North America
Sinkhole Plain, polygonal doline karst, near Mammoth Cave, Kentucky, United States of America, North America
Lonar meteorite crater, world's only impact crater in basalt, Deccan plateau, Maharashtra, India, Asia
Farmhouse beneath limestone scarp, Glwyseg mountain, Llangollen, Clwyd, Wales, United Kingdom, Europe
Rock formations, Cappadocia, Anatolia, Turkey, Asia Minor, Asia
Rock formations, Cappadocia, Anatolia, Turkey, Asia Minor, Asia
Stratified rock at Agio Pavlos in southern Crete, island of Crete, Greece, Mediterranean, Europe
Stratified rock at Agio Pavlos in southern Crete, island of Crete, Greece, Mediterranean, Europe
Rock outcrops at Hartland Quay, North Cornwall, England, United Kingdom, Europe
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
The world's longest dinosaur tracks, Cretaceous Titanosaurus, near Sucre, Bolivia, South America
The world's longest dinosaur tracks, Cretaceous Titanosaurus, near Sucre, Bolivia, South America
The world's longest dinosaur tracks, Cretaceous Titanosaurus, near Sucre, Bolivia, South America
Arbol de Piedra, wind eroded rock near Laguna Colorada, Southwest Highlands, Bolivia, South America
Wild vicunas on borax mineral flats, Laguna Verde, with mineral flat margin, Southwest Highlands, Bolivia, South America
Laguna Verde with mineral flat margin and Volcan Licancabur, 5960m, Southwest Highlands, Bolivia, South America
Laguna Verde with mineral flat margin and Volcan Licancabur, 5960m, Southwest Highlands, Bolivia, South America
Sof Omar cave, downstream maze, daylight in through multiple entrances, Southern Highlands, Ethiopia, Africa
Sof Omar cave, exit into the downstream gorge, Southern Highlands, Ethiopia, Africa
Sof Omar cave, main gallery of River Web, Southern Highlands, Ethiopia, Africa
Tufa towers at Lac Abhe (Abbe), formed by hot springs beneath old lake at higher level, Afar Triangle, Djibouti, Africa
Tufa towers at Lac Abhe (Abbe), formed by hot springs beneath old lake at higher level, Afar Triangle, Djibouti, Africa
Lavas from Ardoukoba volcano in Rift Valley 152m below sea 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
Pools at sunset, Pamukkale, UNESCO World Heritage Site, Anatolia, Turkey, Asia Minor
Laguna Verde, Salar de Uyuni, Bolivia, South America
El Tatio geyser, Atacama, Chile, South America
Afzgar Arch, Akakus, Sahara desert, Fezzan, Libya, North Africa, Africa
Afzgar Arch, Akakus, Sahara desert, Fezzan, Libya, North Africa, Africa
Rock formation called 'the finger of Allah', Akakus, Sahara desert, Fezzan, Libya, North Africa, Africa
Fissure vent with spatter cones, Laki Volcano, Iceland, Polar Regions
Fissure vent with spatter cones, Laki Volcano, Iceland, Polar Regions
Strong folding in garnet gneiss, Hammerfest, Norway, Scandinavia, Europe