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Cliff detail, Hells Gate, Kenya, East Africa, Africa
Outer crater and the small scoria cone, Formica leo, Piton de la Fournaise, Reunion, Africa
Chesil Bank, Dorset, England, United Kingdom, Europe
Snow-capped mountains and steep cliffs of Icy Arm, Baffin Island, Nunavut, Canada, North America
Impressive Dynjandifoss waterfall, in Arnafjordur fjord, in the West Fjords (Vestfirdir), Iceland, Polar Regions
Karst limestone peaks within Ordesa and Monte Perdido National Park, Spanish Pyrenees, Huesca, Aragon, Spain, Europe
The Siq, Petra, UNESCO World Heritage Site, Jordan, Middle East
Uluru (Ayers Rock), Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific
Folded limestone, Stair Hole, Lulworth Cove, Dorset, England, United Kingdom, Europe
Forested hills and snow capped mountains at Tianshan near Sayram Lake in Xinjiang, China, Asia
Steam rising from hot springs at Krisuvik on the south west peninsula of Iceland, Polar Regions
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
Natural bridge, Aruba, Antilles, Central America
Hot springs and mud pools, Salar de Uyuni, Bolivia, South America
Akakus, Sahara desert, Fezzan, Libya, North Africa, Africa
Red beach, Akrotiri, island of Santorini (Thira), Cyclades Islands, Aegean, Greek Islands, Greece, Europe
Kilauea volcano crater showing solidified ropy lava called pahoehoe, The Big Island, Hawaii, Hawaiian Islands, United States of America, North America
Valley of Goreme, central Cappadocia, Anatolia, Turkey, Asia Minor, Asia
Valley of Goreme, central Cappadocia, Anatolia, Turkey, Asia Minor, Asia
Rock formations and coastline near Canoa Quebrada, Canoa Quedrada, Ceara', Brazil, South America
Coastal rock formations, Yehliu, Taipei County, Taiwan, Asia
Gullies eroded into the Pierre shales below Loop Road, Sage Creek wilderness, Badlands National Park, South Dakota, United States of America, North America
Tourists on terraces, Pamukkale, UNESCO World Heritage Site, Anatolia, Turkey, Asia Minor, Eurasia
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
Yesnaby Castle sea stack, rock eroded by the sea, Mainland, Orkney Islands, Scotland, United Kingdom, Europe
Rocky coast near Yesnaby, Mainland, Orkney Islands, Scotland, United Kingdom, Europe
Black boulder rocks in Talisker Bay, Isle of Skye, Inner Hebrides, Scotland, United Kingdom, Europe
Rock arches and cliffs at Ponte da Piedade near Lagos, Algarve, Portugal, Europe
Uluru (Ayers Rock), Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific
Horseshoe Bend, Colorado River, near Page, Arizona, United States of America, North America
Rock formations, Kaleto fortress, Belogradchik, Bulgaria, Europe
Frank Slide (massive rockslide of limestone from Turtle Mountain that buried town in 1903), Crowsnest Pass, southern Alberta, Rockies, Canada, North America
Arenal volcano, La Fortuna, Costa Rica, Central America
Anisclo Canyon and eroded karst limestone Mondoto peak, Ordesa and Monte Perdido National Park, Huesca, Aragon, Spain, Europe
Blue Grotto near Zurrieq, Malta, Mediterranean, Europe
View over the Messel Pit, UNESCO World Heritage Site, Hesse, Germany, Europe
Snow on pinnacles and rock formations in the Bryce Canyon National Park in Utah, United States of America, North America
Pancake Rocks, Punakaiki, Paparoa National Park, Westland, South Island, New Zealand, Pacific
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
Calcium formations, Pamukkale, UNESCO World Heritage Site, Anatolia, Turkey, Asia Minor, Asia
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
Active geysers on geyserite domes, El Tatio geyser basin on altiplano, Atacama Desert, Chile, South 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
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
Hierve el Agua (the water boils), hot springs, water rich in minerals bubbles up from the mountains and pours over edge, Oaxaca, Mexico, North America
Norber erratics near Austwick, erratic boulders left on limestone pavement by erosion, Yorkshire Dales National Park, Yorkshire, England, United Kingdom, Europe
Pohutu Geyser at Te Puia Wakarewarewa Geothermal Village, Rotorua, Taupo Volcanic Zone, North Island, New Zealand, Pacific
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
Artist's Palette, Artist's Drive, Death Valley National Park, California, United States of America, North America
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
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
Torrey Pines State Beach, San Diego, California, United States of America, North America
Mammoth skeleton from the Pleistocene Ice Age at the Nevada State Museum, Carson City, Nevada, United States of America, North America
Skocjan caves, UNESCO World Heritage Site, Slovenia, Europe
Sand dunes in the Great Sand Dunes National Park and Preserve with Sangre Cristo Mountains in the background, Colorado, United States of America, North America
Rio Grande Gorge Bridge near Taos, New Mexico, United States of America, North America
Dyrholaey natural arch, the southernmost point in Iceland, near Vik, in the south of Iceland (Sudurland), Iceland, Polar Regions
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
Glacier near Plaza de Mulas basecamp, Aconcagua Provincial Park, Andes mountains, Argentina, South America
Fingal's Cave, Isle of Staffa, Inner Hebrides, Scotland, United Kingdom, Europe
Hiker on walkways admires the creek in the narrow limestone gorge, Aare Gorge, Bernese Oberland, Canton of Uri, Switzerland, Europe
Dinosaur Trackway, Clayton Lake State Park, Clayton, New Mexico, United States of America, North America
Thingvellir, site of original 10th century Althingi (Parliament) and geographical rift between Europe and North America, Iceland, Polar Regions
Cliffs towering over West Bay Beach, Dorset, England, United Kingdom, Europe
Close-up of rock, ochre earth and prickly pear cactus, Santorini (Thira), Cyclades Islands, Greek Islands, Greece, Europe
The hot blue waters and mineral deposits of the Blue Lagoon ipopular with bathers and good for skin complaints, Svartsengi, Iceland, Polar Regions
Rock formations caused by erosion in a desert landscape in Monument Valley, Arizona, United States of America, North America
Tourists cross flood scoured rocks, past typical formations, Purnululu National Park, UNESCO World Heritage Site, Bungle Bungle, Kimberley, Western Australia, Australia, Pacific
Echinus Geyser, erupts every hour in Norris Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America (U.S.A.), North America
Peaks and high valleys on the side of the Cares Gorge, Picos de Europa, Cantabria, Spain, Europe
Aletschglacier, with Jungfrau and Monch mountains in background, Bernese Alps from south, Switzerland, Europe
Cave temples, 1500 years old, carved in basalt cliff above Waghore River, Ajanta, UNESCO World Heritage Site, Maharashtra, India, Asia
Capo Boi, southeast coast, island of Sardinia, Italy, Mediterranean, Europe
Favignana, Egadi Islands, Sicily, Italy, Mediterranean, Europe
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
The world's largest natural pitch lake, 90 meters deep, Trinidad, West Indies, Caribbean, Central America
Rocky Coast and Yesnaby castle, a sea stack, near Yesnaby, Mainland, Orkney Islands, Scotland, United Kingdom, Europe
Yesnaby Castle sea stack, rock eroded by the sea, Mainland, Orkney Islands, Scotland, United Kingdom, Europe
Basaltic cliffs dominating Raasay Sound, east coast of Skye, Trotternish, Isle of Skye, Inner Hebrides, Scotland, United Kingdom, Europe
Black boulder rocks in Talisker Bay, Isle of Skye, Inner Hebrides, Scotland, United Kingdom, Europe
Uluru (Ayers Rock), Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific
Examining dinosaur tracks, Broome, Kimberley, Western Australia, Australia, Pacific
Crater lake at Manengouba, Western Cameroun, Cameroon, Africa
Patterns created by sea erosion on rocks at Rumbling Kern, near Howick, Alnwick, Northumberland, England, United Kingdom, Europe
Fjallsarlon glacial lake and Fjallsjokull (Oraefajokull) glacier near Jokulsarlon glacial lagoon, south-east Iceland (Austurland), Iceland, Polar Regions
The Pont d'Arc, natural arch over the Ardeche River, Ardeche, Rhone-Alpes, France, Europe
Red Rock Canyon outside Las Vegas, Nevada, United States of America, North America
Fossil ferns found in Radstock Colliery, Mariopteris carboniferous coal measures, Somerset, England, United Kingdom, Europe
Yellow and orange volcanic rock, Nisyros (Nisiros) (Nissyros), Dodecanese islands, Greece, Mediterranean, Europe
The Screes, Lake Wastwater, Wasdale, Lake District National Park, Cumbria, England, United Kingdom, Europe
Bromo-Tengger-Semeru National Park at dawn, island of Java, Indonesia, Southeast Asia, Asia
Thassos (Thasos), Aegean Islands, Greek Islands, Greece, Europe
Detail of red cliff, Dzhety-Oguz, near Kara-Kol, Kyrgyzstan, Central Asia, Asia
Unusual weathered rock formation, the Olgas, Northern Territory, Australia, Pacific
View from the Copper Canyon train, Mexico, North America