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Impressive Dynjandifoss waterfall, in Arnafjordur fjord, in the West Fjords (Vestfirdir), Iceland, Polar Regions
Yaga River and karst limestone cliffs of Escuain gorge, Ordesa and Monte Perdido National Park, Huesca, Aragon, Spain, Europe
Folded layers of Jurassic sedimentary limestone and marl rocks in the cliffs at Vega beach, Ribadesella, Asturias, Spain, Europe
View over the Messel Pit, UNESCO World Heritage Site, Hesse, Germany, Europe
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
Moss covered lava beds surround Snaefellsjokull, an active strato volcano capped in snow and ice, on the Snaefellsnes Peninsula, North West area, Iceland, Polar Regions
Eroded coastal limestone outcrops at Nanarup near Albany, Western Australia, Australia, Pacific
Limestone pinnacles in Shilin, Stone Forest, in Lunan, Yunnan Province, China, Asia
Landscape of snow-covered snow gums, mountainsand clouds, seen from Mount Buller, High Country, Victoria, Australia, Pacific
Dormant volcano, Mount Ngauruhoe, Tongariro National Park, UNESCO World Heritage Site, Taupo, South Auckland, North Island, New Zealand, Pacific
Fox Glacier, Westland, west coast, South Island, New Zealand, Pacific
Indus Valley and Stok-Kangri massif, Leh, Ladakh, Indian Himalayas, India, Asia
Salt desert of Uyuni, Bolivia, South America
Red beach, Akrotiri, island of Santorini (Thira), Cyclades Islands, Aegean, Greek Islands, Greece, Europe
Multi-coloured cliffs on the coast, Alum Bay, Isle of Wight, England, United Kingdom, Europe
Valley of Goreme, central Cappadocia, Anatolia, Turkey, Asia Minor, Asia
Atacama Desert and Volcan Licancabur, San Pedro de Atacama region, Chile, South America
Old Man of Hoy, sandstone sea stack 137m high, with ferry in background, Hoy, Orkney Islands, Scotland, United Kingdom, Europe
Gullies eroded into the Pierre shales below Loop Road, Sage Creek wilderness, Badlands National Park, South Dakota, United States of America, North America
Village set on granite hill, Monsanto, Castelo Branco, Beira Baixa, eastern area, Portugal, Europe
Natural rock arch, desert scenery, Wadi Rum, Jordan, Middle East
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
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
The desolate landscape of Lac Abbe, dotted with limestone chimneys, Djibouti, Africa
Uluru (Ayers Rock), Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific
Dune de Pilat, Gironde, Aquitaine, France
Tunnel in limestone, Chinese Temple, Sam Poh Tong, Ipoh, Perak state, Malaysia, Southeast Asia, Asia
Outer crater and the small scoria cone, Formica leo, Piton de la Fournaise, Reunion, Africa
Glacier detail in Icy Arm, Baffin Island, Nunavut, Canada, North America
Snow-capped mountains and steep cliffs of Icy Arm, Baffin Island, Nunavut, Canada, North America
Dry river and beehive-like mounds in the Purnululu National Park, UNESCO World Heritage Site, Bungle Bungle mountain range, Western Australia, Australia, Pacific
Colourful patterns created by sea erosion on rocks revealed at low tide on Spittal Beach, Berwick-upon-Tweed, Northumberland on border between England and Scotland, United Kingdom, Europe
Blyde River Canyon, Mpumalanga, South Africa, Africa
Hverir geothermal fields at the foot of Namafjall mountain, Myvatn lake area, Iceland, Polar Regions
Summit crater, Volcan Cotopaxi, 5897m, the highest active volcano in the world, Ecuador, South America
Karst limestone sea cliffs at Pria, with Picos de Europa mountains in the background, near Llanes, Asturias, Spain, Europe
Karst limestone peaks within Ordesa and Monte Perdido National Park, Spanish Pyrenees, Huesca, Aragon, Spain, Europe
Crater Lakes at Keli Mutu, Moni, Flores, Indonesia, Southeast Asia, Asia
Forested hills and snow capped mountains at Tianshan near Sayram Lake in Xinjiang, China, Asia
Rock formations caused by erosion in a desert landscape in Monument Valley, Arizona, United States of America, North America
White Cliffs of Dover, Dover, Kent, England, United Kingdom, Europe
Calcium formations, Pamukkale, UNESCO World Heritage Site, Anatolia, Turkey, Asia Minor, Asia
Slot canyon in red sandstone, Antelope Canyon, near Page, Arizona, United States of America (U.S.A.), North America
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
Lava dome in crater seen from rim, Mount St. Helens after 1980 eruption, with Spirit Lake and Mount Rainier in the distance, Mount St. Helens National Volcanic Monument, Washington State, United States of America (U.S.A.), North America
Aerial view of peak of Mount Cook, Mount Cook National Park, Southern Alps, Canterbury, South Island, New Zealand, Pacific
Favignana, Egadi Islands, Sicily, Italy, Mediterranean, Europe
Akakus, Sahara desert, Fezzan, Libya, North Africa, Africa
Royal tomb, Petra, UNESCO World Heritage Site, Jordan, Middle East
Rock formations and coastline near Canoa Quebrada, Canoa Quedrada, Ceara', Brazil, South America
Pars-kamor lighthouse, Ploumanach, Breton Corniche, Cote de Granit Rose, Cotes d'Armor, Brittany, France, Europe
Hot water pools in this area of geothermal activity, Geysir, Iceland, Polar Regions
Tourists on terraces, Pamukkale, UNESCO World Heritage Site, Anatolia, Turkey, Asia Minor, Eurasia
Rocky coast near Yesnaby, Mainland, Orkney Islands, Scotland, United Kingdom, Europe
Erg Awbari, Sahara desert, Fezzan, Libya, North Africa, Africa
Lava flow from the Monti Calcarazzi fissure on the southern flank of Mount Etna in 2001, threatening the town of Nicolosi below, Sicily, Italy, Europe
Zhijin Cave, the largest in China at 10 km long and 150 high, Guizhou Province, China, Asia
View of sedimentary layers from Cape Hay, Bylot Island, Nunavut, Canada, North America
Laugahraun lava field seen from the slopes of Blahnukur, Landmannalaugar area, Fjallabak region, Iceland, Europe
Blue Grotto near Zurrieq, Malta, Mediterranean, Europe
Fossil ferns found in Radstock Colliery, Mariopteris carboniferous coal measures, Somerset, England, United Kingdom, Europe
Steam rising from hot springs at Krisuvik on the south west peninsula of Iceland, Polar Regions
The Screes, Lake Wastwater, Wasdale, Lake District National Park, Cumbria, England, United Kingdom, Europe
Natural bridge, Aruba, Antilles, Central America
Erosion with volcanic tuff pillars, Pasabagi, near Goreme, Cappadocia, Anatolia, Turkey, Asia Minor, Asia
Volcanic stratified rocks, Parque Nacional del Teide, Tenerife, Canary Islands, Spain, Europe
Eternal fire of the Chimera, Olympus, Turkey, Eurasia
Pohutu Geyser at Te Puia Wakarewarewa Geothermal Village, Rotorua, Taupo Volcanic Zone, North Island, New Zealand, Pacific
Rocky Coast and Yesnaby castle, a sea stack, near Yesnaby, Mainland, Orkney Islands, Scotland, United Kingdom, Europe
Crater lake at Manengouba, Western Cameroun, Cameroon, Africa
Atta Cave near Attendorn, Sauerland, North Rhine-Westphalia, Germany, Europe
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
Poas Volcano, Poas Volcano National Park, Costa Rica, Central America
Salt pan polygons at Badwater Basin, 282ft below sea level and the lowest place in North America, Death Valley National Park, California, United States of America, North America
Waterfall in summer sunshine at Foss a Sidu, South coast, Iceland, Polar Regions
Snow on pinnacles and rock formations in the Bryce Canyon National Park in Utah, United States of America, North America
Algae in the hot springs at Orakei Korako, South Auckland, North Island, New Zealand, Pacific
Balanced Rock, a pinnacle of red sandstone caused by erosion, in the Arches National Park in Utah, United States of America, North America
The hot blue waters and mineral deposits of the Blue Lagoon ipopular with bathers and good for skin complaints, Svartsengi, Iceland, Polar Regions
Faces in the rocks, Le Pere Trebeurden, at Trebeurden on the Cote de Granit Rose on the Cotes d'Amor, Brittany, France, Europe
Tourists cross flood scoured rocks, past typical formations, Purnululu National Park, UNESCO World Heritage Site, Bungle Bungle, Kimberley, Western Australia, Australia, Pacific
Castle and Sawmill Geysers in eruption in Old Faithful Geyser Basin in winter, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America (U.S.A.), North America
Blisters measuring about 10 cm across in boiling mud pool, Mud volcano, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America (U.S.A.), North America
Hot springs and mud pools, Salar de Uyuni, Bolivia, South America
Unusual weathered rock formation, the Olgas, Northern Territory, Australia, Pacific
View from the Copper Canyon train, Mexico, North America
Hot water in pools on calcite terraces deposited by Mammoth Hot Springs, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America (U.S.A.), North America
Early morning light on the Pinnacles, Handfast Point, Studland, Dorset, England, United Kingdom, Europe
Colourful volcanic landscape, Tupiza, Southern Altiplano, Bolivia, South America
Landscape with fairy chimneys, Pasabag, near Zelve, Cappadocia, Anatolia, Turkey, Eurasia
Na Pali, north coast of the island of Kauai, Hawaii, United States of America, Pacific, North America
St. Ninian's Isle tombolo, connecting St Ninian to Mainland, South Mainland, Shetland Islands, Scotland, United Kingdom, Europe
Limestone rocks near the sea at sunset, The Burren, County Clare, Munster, Republic of Ireland (Eire), Europe
Hot steam, Craters of the Moon Thermal Area, Taupo, North Island, New Zealand, Pacific
Harrisons Cave, Barbados, West Indies, Caribbean, Central America
Hikers walking through a lava field on the Tongariro Crossing, Tongariro National Park, the oldest national park in the country, UNESCO World Heritage Site, Taupo Volcanic Zone, North Island, New Zealand, Pacific
Basaltic cliffs dominating Raasay Sound, east coast of Skye, Trotternish, Isle of Skye, Inner Hebrides, Scotland, United Kingdom, Europe
The Olgas, Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific