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Kilauea volcano crater showing solidified ropy lava called pahoehoe, The Big Island, Hawaii, Hawaiian Islands, United States of America, North America
Active geysers on geyserite domes, El Tatio geyser basin on altiplano, Atacama Desert, Chile, South America
Queen's Head, coastal rock formations, Yehliu, Taipei County, Taiwan, Asia
The smoking Volcan Villarrica, 2847m, Lake District, Chile, South America
Landscape with fairy chimneys, Pasabag, near Zelve, Cappadocia, Anatolia, Turkey, Eurasia
Koryaksky volcano, 3456m high, conical andesite volcano, Kamchatka, UNESCO World Heritage Site, Eastern Siberia, Russia, Eurasia
Tourists on terraces, Pamukkale, UNESCO World Heritage Site, Anatolia, Turkey, Asia Minor, Eurasia
View from the caldera of the volcano of Pico de Fogo, Fogo (Fire), Cape Verde Islands, Africa
Hot steam, Craters of the Moon Thermal Area, Taupo, North Island, New Zealand, Pacific
The world's largest natural pitch lake, 90 meters deep, Trinidad, West Indies, Caribbean, Central America
Erg Awbari, Sahara desert, Fezzan, Libya, North Africa, Africa
White Sands National Monument, world's largest gypsum dunefield, New Mexico, United States of America, North America
Horseshoe Bend, Colorado River, near Page, Arizona, United States of America, North America
Cliff detail, Hells Gate, Kenya, East Africa, Africa
New eruptive cone on the flank of Volcan Lonquimay, Araucania region, Chile, South America
Frank Slide (massive rockslide of limestone from Turtle Mountain that buried town in 1903), Crowsnest Pass, southern Alberta, Rockies, Canada, North America
Fjallsarlon glacial lake and Fjallsjokull (Oraefajokull) glacier near Jokulsarlon glacial lagoon, south-east Iceland (Austurland), 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
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
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
Thingvellir, site of original 10th century Althingi (Parliament) and geographical rift between Europe and North America, Iceland, Polar Regions
Staffa, Inner Hebrides, Argyll and Bute, Scotland, United Kingdom, Europe
Cascade Terrace at Orakei Korako Thermals in the North Island of New Zealand, Pacific
Landscape of the Swat River valley in Pakistan, Asia
Fossil ferns found in Radstock Colliery, Mariopteris carboniferous coal measures, Somerset, England, United Kingdom, Europe
Longpanga Lake with lateral moraine on the right in the Gokyo Valley in Khumbu Himal in Nepal, Asia
Christian chapel, Notre Dame de Port Blanc, on rocks on coast, Cote de Granit Rose (Cotes d'Armor) (Pink Granite Coast), Brittany, France, Europe
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
Peaks and high valleys on the side of the Cares Gorge, Picos de Europa, Cantabria, Spain, Europe
Badlands from Zabriskie Point, looking west, Death Valley National Monument, California, United States of America (U.S.A.), North America
Moraine Lake with mountains that overlook Valley of the Ten Peaks, Banff National Park, Canada, North America
Cave temples, 1500 years old, carved in basalt cliff above Waghore River, Ajanta, UNESCO World Heritage Site, Maharashtra, India, Asia
Bromo-Tengger-Semeru National Park at dawn, island of Java, Indonesia, Southeast Asia, Asia
Death Vlei, Namib Naukluft Park, Namibia, Africa
Detail of red cliff, Dzhety-Oguz, near Kara-Kol, Kyrgyzstan, Central Asia, Asia
Volcano cone viewed from la Dehesa, with sea beyond, El Hierro, Canary Islands, Spain, Atlantic, Europe
Koryaksky volcano. UNESCO World Heritage Site, behind Stalinist suburban flats, Petropavlovsk, Kamchatka, Eastern Siberia, Russia, Eurasia
Monument Valley Navajo Tribal Park, Utah Arizona border, United States of America, North America
Monument Valley Navajo Tribal Park, Utah Arizona border area, United States of America, North America
Norber erratics near Austwick, erratic boulders left on limestone pavement by erosion, Yorkshire Dales National Park, Yorkshire, England, United Kingdom, Europe
Norber erratics near Austwick, erratic boulders left on limestone pavement by erosion, Yorkshire Dales National Park, Yorkshire, England, United Kingdom, Europe
Harrisons Cave, Barbados, West Indies, Caribbean, Central America
Sulphur springs, Soufriere, St. Lucia, Windward Islands, West Indies, Caribbean, Central America
Limestone Mogotes, Vinales Valley, UNESCO World Heritage Site, Pinar del Rio, Cuba, West Indies, Caribbean, Central America
Uluru (Ayers Rock), Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific
The Olgas, Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific
Katherine Groge, Northern Territory, Australia, Pacific
Gornergrat mountain range and Gorner glacier (Gornergletscher), above Zermatt in the Swiss Alps, Valais, Switzerland, Europe
Glacier detail in Icy Arm, Baffin Island, Nunavut, Canada, North America
Mammoth skeleton from the Pleistocene Ice Age at the Nevada State Museum, Carson City, Nevada, United States of America, North America
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
Thor's Hammer near Sunset Point, Bryce Canyon National Park, Utah, United States of America, North America
Landscape of the interior from the F-208 route (Fjallabak route north, Nyrdri-Fjallabak) between Holaskjol and Landmannalaugar, south Iceland (Sudurland), Iceland, Polar Regions
Uluru (Ayers Rock), Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific
Fingal's Cave, Isle of Staffa, Inner Hebrides, Scotland, United Kingdom, Europe
Close-up of dinosaur footprint, Dinosaur Trackway, Clayton Lake State Park, Clayton, New Mexico, United States of America, North America
Close-up of rock, ochre earth and prickly pear cactus, Santorini (Thira), Cyclades Islands, Greek Islands, Greece, Europe
Painted landscape in the Gurbantinggut Desert in Xinjiang, China, Asia
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
Rocks at Bohuslan, Maskar, Koster Islands, Sweden, Scandinavia, Europe
Steam rising from hot springs at Krisuvik on the south west peninsula of Iceland, Polar Regions
Mount Cook, at 3755m, the highest mountain in N.Z., Canterbury, South Island, New Zealand, Pacific
Rock formations caused by erosion and known as North Window Arch, Arches National Park, Utah, United States of America, North America
Reynards Cave Arch, Dovedale, Derbyshire, England, United Kingdom, Europe
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
Rock formations of the Three Sisters from Echo Point, Blue Mountains, UNESCO World Heritage Site, New South Wales (NSW), Australia, Pacific
Aletschglacier, with Jungfrau and Monch mountains in background, Bernese Alps from south, Switzerland, Europe
Beauchamp Falls, Blue Mountains National Park, UNESCO World Heritage Site, near Blackheath, New South Wales (N.S.W.), Australia, Pacific
Houses in rock formations, Cappadocia, Anatolia, Turkey, Asia Minor, Asia
Bagia, island of Sardinia, Italy, Mediterranean, Europe
Spitzkoppe, a rock formation, between Windoek and Shakapmund, Namibia, Africa
Hot springs and mud pools, Salar de Uyuni, Bolivia, South America
Unusual weathered rock formation, the Olgas, Northern Territory, Australia, Pacific
White chalk cliffs, Etretat, Cote d'Albatre (Alabaster Coast), Haute Normandie (Normandy), France, Europe
Small boat on the River Verdon in the Grand Canyon of the Verdon, Alpes-de-Haute-Provence, Provence, France, Europe
Les Mees, The Penitents, Provence, France, Europe
Gorges of Verdon, Alpes-de-Haute-Provence, Provence, France, Europe
Turret Arch through North Window at sunrise, Arches National Park, Moab, Utah, United States of America, North America
Dinosaur Tracks, Clayton Lake State Park, New Mexico, 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
Limestone rocks near the sea at sunset, The Burren, County Clare, Munster, Republic of Ireland (Eire), Europe
Artist's Palette, Artist's Drive, Death Valley National Park, California, United States of America, North America
Basaltic cliffs dominating Raasay Sound, east coast of Skye, Trotternish, Isle of Skye, Inner Hebrides, Scotland, United Kingdom, Europe
Red Canyon in Dixie National Forest, Utah, United States of America, North America
Limestone rock formations, Stone Forest, near Kunming, Yunnan, China, Asia
The Devil's Pebbles, piles of granite boulders near the Stuart Highway, north of Tennant Creek, Northern Territory, Australia, Pacific
Glacier on southeast coast, South Georgia, Polar Regions
Harrison's Cave, Barbados, West Indies, Caribbean, Central America
Lava flows during eruption of Mount Etna, Sicily, Italy, Europe
Eiger Glacier (Eigergletscher), between Monch (Monk) and Eiger mountains in the Swiss Alps, Bernese Oberland, Switzerland, Europe
Terraced thermal pools, Pamukkale, UNESCO World Heritage Site, Anatolia, Turkey, Asia Minor, Eurasia
Faraglioni, Scopello, Castellamare del Golfo, Sicily, Italy, Europe
Dyrholaey natural arch, the southernmost point in Iceland, near Vik, in the south of Iceland (Sudurland), Iceland, Polar Regions
Jokulsarlon glacial lagoon beneath Breidarmerkurjokull (Vatnajokull) glacier which feeds it, south-east Iceland (Austurland), Iceland, Polar Regions
Hverfjall volcano, Reykjahlid, Iceland, Polar Regions
Hverir geothermal fields at the foot of Namafjall mountain, Myvatn lake area, Iceland, Polar Regions
Delicate Arch, Arches National Park, Moab, Utah, United States of America, North America
The Fisher Towers in Castle Valley, near Moab, Utah, United States of America, North America