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Erosion prevention, contoured bands of trees unfelled, also acting as fire break, Leadville, Colorado, United States of America, North America
Lake of the Clouds, Carlsbad Caverns National Park, UNESCO World Heritage Site, New Mexico, United States of America, North America
Cooled lava from recent eruption, Kilauea Volcano, Hawaii Volcanoes National Park, UNESCO World Heritage Site, Island of Hawaii (Big Island), Hawaii, United States of America, North America
St. Ninian Isle sand tombolo, connecting St. Ninian to Mainland, South Mainland, Shetland Islands, Scotland, United Kingdom, Europe
Eshaness basalt cliffs, Calder's Geo, ancient volcanic crater, coast deeply eroded with caves, blowholes and stacks, Northmavine, Shetland Islands, Scotland, United Kingdom, Europe
Limestone rocks near the sea at sunset, The Burren, County Clare, Munster, Republic of Ireland (Eire), Europe
Stoura Pund cliffs and stacks of red sandstone, Eshaness, Northmavine, Shetland Islands, Scotland, United Kingdom, Europe
Limestone plateau, karstic landscape, Burren region, County Clare, Munster, Republic of Ireland, Europe
Limestone plateau at sunset, karstic landscape, Burren region, County Clare, Munster, Republic of Ireland, Europe
Erg Awbari, Sahara desert, Fezzan, Libya, North Africa, Africa
Uluru (Ayers Rock), Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific
Curved stalactites and wall flowstone of pure salt, in cave in Namakdan salt dome, Qeshm Island, southern Iran, Middle East
Snow-capped mountains and steep cliffs of Icy Arm, Baffin Island, Nunavut, Canada, North America
Granite rocks at Ile de Coco, Seychelles, Indian Ocean, Africa
Natural Bridges National Monument, Sipapu Bridge, Utah, United States of America, North America
Summit crater, Volcan Cotopaxi, 5897m, the highest active volcano in the world, Ecuador, South America
Tourists walking on lava flow on Isla Santiago, Sullivan Bay, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America
Folded layers of Jurassic sedimentary limestone and marl rocks in the cliffs at Vega beach, Ribadesella, Asturias, Spain, Europe
Fingal's Cave, Isle of Staffa, Inner Hebrides, Scotland, United Kingdom, Europe
View over the Messel Pit, UNESCO World Heritage Site, Hesse, Germany, Europe
Visitors from ice-breaker tour ship, July 14 Glacier, Krossfjorden, Spitsbergen, Svalbard, Norway, Scandinavia, Europe
Crater Lakes at Keli Mutu, Moni, Flores, Indonesia, Southeast Asia, Asia
The Perito Moreno Glacier, rare in that it is advancing rather than retreating, Los Glaciares National Park, UNESCO World Heritage Site, Patagonia, Argentina, South America
Forested hills and snow capped mountains at Tianshan near Sayram Lake in Xinjiang, China, Asia
Snow on pinnacles and rock formations in the Bryce Canyon National Park in Utah, United States of America, North America
White Cliffs of Dover, Dover, Kent, England, United Kingdom, Europe
Late winter hiker on Tongariro Crossing, Mount Ngauruhoe and South Crater, Tongariro National Park, UNESCO World Heritage Site, Taupo, South Auckland, North Island, New Zealand, Pacific
Sand dunes, Erg Murzuq, Sahara desert, Fezzan, Libya, North Africa, Africa
Valley of Goreme, central Cappadocia, Anatolia, Turkey, Asia Minor, Asia
Roque Nublo (mountain peak), near Ayacata, Gran Canaria, Canary Islands, Spain, Atlantic, Europe
Atacama Desert and Volcan Licancabur, San Pedro de Atacama region, Chile, South America
Volcanic stratified rocks, Parque Nacional del Teide, Tenerife, Canary Islands, Spain, Europe
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
The Twelve Apostles, on the Great Ocean Road, Victoria, Australia, Pacific
Tunnel in limestone, Chinese Temple, Sam Poh Tong, Ipoh, Perak state, Malaysia, Southeast Asia, Asia
Jostedalsbreen Glacier, Fjaerland, Norway, Scandinavia, Europe
Outer crater and the small scoria cone, Formica leo, Piton de la Fournaise, Reunion, Africa
Remarkable Rocks, Flinders Chase National Park, Kangaroo Island, South Australia, Australia, Pacific
View of sedimentary layers from Cape Hay, Bylot Island, Nunavut, Canada, North America
Salt and algal deposits at Lake Clifton, one of a string of coastal lakes south of Mandurah, Yalgorup National Park, Mandurah, Western Australia, Australia, Pacific
Impressive Dynjandifoss waterfall, in Arnafjordur fjord, in the West Fjords (Vestfirdir), Iceland, Polar Regions
Huge stone towers in the Ucka Canyon, Istria, Croatia, Europe
Blyde River Canyon, Mpumalanga, South Africa, Africa
Severe erosion of loose Quaternary glacial sands on this coast that has retreated more than 500m since the1830s, Covehithe, Suffolk, England, United Kingdom, Europe
Yaga River and karst limestone cliffs of Escuain gorge, Ordesa and Monte Perdido National Park, Huesca, Aragon, Spain, Europe
Cracked earth and rocks in the Outback of South Australia, Australia, Pacific
Close-up of the limestone terraces formed by volcanic water depositing six inches of calcium carbonate a year, Mammoth Hot Springs and Terraces, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
The Grand Canyon seen from the North Rim, UNESCO World Heritage Site, Arizona, United States of America, North America
Rock formations caused by erosion in a desert landscape in Monument Valley, Arizona, United States of America, North America
Calcium formations, Pamukkale, UNESCO World Heritage Site, Anatolia, Turkey, Asia Minor, Asia
Dormant volcano, Mount Ngauruhoe, Tongariro National Park, UNESCO World Heritage Site, Taupo, South Auckland, North Island, New Zealand, Pacific
Natural bridge, Aruba, Antilles, Central America
Under the glacier, Perito Moreno, Argentina, South America
View from the Copper Canyon train, Mexico, North America
Early morning light on the Pinnacles, Handfast Point, Studland, Dorset, England, United Kingdom, Europe
Alum Bay, Isle of Wight, England, United Kingdom, Europe
Grand Canyon at sunset, UNESCO World Heritage Site, Arizona, United States of America, North America
Steam plume off boiling acid lake, Naka-dake active crater, Aso volcano, Kyushu, Japan, Asia
Sacred Valley of the Inca, Urubamba, Peru, South America
Norber erratics near Austwick, erratic boulders left on limestone pavement by erosion, Yorkshire Dales National Park, Yorkshire, England, United Kingdom, Europe
Sea and salt formations with hotels and desert cliffs beyond, Ein Bokek Hotel Resort, Dead Sea, Israel, Middle East
Pohutu Geyser at Te Puia Wakarewarewa Geothermal Village, Rotorua, Taupo Volcanic Zone, North Island, New Zealand, Pacific
The desolate landscape of Lac Abbe, dotted with limestone chimneys, Djibouti, Africa
Rock arches and cliffs at Ponte da Piedade near Lagos, Algarve, Portugal, Europe
The Olgas, Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific
White Sands National Monument, world's largest gypsum dunefield, New Mexico, United States of America, North America
The Domes, Bungle Bungle, Purnululu National Park, UNESCO World Heritage Site, Kimberley, Western Australia, Australia, Pacific
Atta Cave near Attendorn, Sauerland, North Rhine-Westphalia, Germany, Europe
Phallic pillars known as fairy chimneys in the valley known as Love Valley near Goreme in Cappadocia, Anatolia, Turkey, Asia Minor, Eurasia
Zhijin Cave, the largest in China at 10 km long and 150 high, Guizhou Province, China, Asia
Active mud flow from line of mud volcanoes, in the Firuze crater, Gobustan, Baku, Azerbaijan, Central Asia, Asia
Gleaming white travertine terraces, nicknamed Cotton castles, Pamukkale, UNESCO World Heritage Site, Anatolia, Turkey, Asia Minor, Eurasia
Dry river and beehive-like mounds in the Purnululu National Park, UNESCO World Heritage Site, Bungle Bungle mountain range, Western Australia, Australia, Pacific
Poas Volcano, Poas Volcano National Park, Costa Rica, Central America
Red Tsingys, strange looking sandstone formations, near Diego Suarez (Antsiranana), Madagascar, Africa
Natural Bridges National Monument, Sipapu Bridge, Utah, United States of America, North America
Views over Caradoc, Lawley and the Wrekin from the Long Mynd, Church Stretton Hills, Shropshire, England, United Kingdom, Europe
Uluru (Ayers Rock), Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific
Hot air ballooning over rock formations, Cappadocia, Anatolia, Turkey, Asia Minor, Asia
Thingvellir, site of original 10th century Althingi (Parliament) and geographical rift between Europe and North America, Iceland, Polar Regions
Lava beds surround Snaefellsjokull, an active strato volcano capped in snow and ice, on the Snaefellsnes Peninsula, North West area, Iceland, Polar Regions
Sand depressions in the flood plain of the Haast River valley at the start of the main divide, Haast, Westland, South Island, New Zealand, Pacific
The hot blue waters and mineral deposits of the Blue Lagoon ipopular with bathers and good for skin complaints, Svartsengi, Iceland, Polar Regions
Fossil logs 200 million years old scattered over desert floor in National Park, Petrified Forest National Park, Arizona, United States of America (U.S.A.), North America
The Screes, Lake Wastwater, Wasdale, Lake District National Park, Cumbria, England, United Kingdom, Europe
Steam fumaroles in geothermal field, Sol de Manana, near Laguna Colorado, Southwest Highlands, Bolivia, South America
Recent pahoehoe basalt lavas, Erte Ale volcano, Danakil Depression, Ethiopia, Africa
Royal tomb, Petra, UNESCO World Heritage Site, Jordan, Middle East
Rock formations and coastline near Canoa Quebrada, Canoa Quedrada, Ceara', Brazil, South America
Coastal rock formations, Yehliu, Taipei County, Taiwan, Asia
Hot water pools in this area of geothermal activity, Geysir, Iceland, Polar Regions
Colourful volcanic landscape, Tupiza, Southern Altiplano, Bolivia, South America
Landscape with fairy chimneys, Pasabag, near Zelve, Cappadocia, Anatolia, Turkey, Eurasia
Natural rock arch, desert scenery, Wadi Rum, Jordan, Middle East
St. Ninian's Isle tombolo, connecting St Ninian to Mainland, South Mainland, Shetland Islands, Scotland, United Kingdom, Europe
Black boulder rocks in Talisker Bay, Isle of Skye, Inner Hebrides, Scotland, United Kingdom, Europe
Landscape typical of the region, with spectacular landslides called locally balze, Volterra, Tuscany, Italy, Europe
Algar do Carvao Caves, Terceira Island, Azores, Portugal, Europe
Uluru (Ayers Rock), Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific
White Sands National Monument, world's largest gypsum dunefield, New Mexico, United States of America, North America