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Limestone plateau, karstic landscape, Burren region, County Clare, Munster, Republic of Ireland, Europe
Lewisian gneiss, one of the oldest rocks on earth formed 2 billion years ago, Isle of Lewis, Outer Hebrides, Scotland, United Kingdom, Europe
Slopes of the Quiraing, a geological wonder, its distinctive features resulting from landslips of basalt lavas upon softer sedimentary rocks beneath, northeast coast of Trotternish Peninsula, Isle of Skye, Inner Hebrides, Scotland, United Kingdom, Europe
The Quiraing escarpment (The Table) ( The Prison), overlooking the Sound of Raasay, Trotternish, Isle of Skye, Inner Hebrides, Scotland, United Kingdom, Europe
Slopes of the Quiraing, a geological wonder, its distinctive features resulting from landslips of basalt lavas upon softer sedimentary rocks beneath, northeast coast of Trotternish Peninsula, Isle of Skye, Inner Hebrides, Scotland, United Kingdom, Europe
Limestone plateau at sunset, karstic landscape, Burren region, County Clare, Munster, Republic of Ireland, Europe
Landscape typical of the region, with cypress trees and spectacular landslides called locally balze, Volterra, Tuscany, Italy, Europe
Erg Awbari, Sahara desert, Fezzan, Libya, North Africa, Africa
Scree slope and limestone vale, near Conistone, Yorkshire Dales National Park, North Yorkshire, England, United Kingdom, Europe
Limestone pavement at Lea Green, Grassington, Yorkshire Dales National Park, North Yorkshire, England, United Kingdom, Europe
Lac Assal, the lowest point on the African continent and the most saline body of water on earth, Djibouti, Africa
Lac Assal, the lowest point on the African continent and the most saline body of water on earth, Djibouti, Africa
Lac Assal, the lowest point on the African continent and the most saline body of water on earth, Djibouti, Africa
Lac Assal, the lowest point on the African continent and the most saline body of water on earth, Djibouti, Africa
The flat expanse of the Grand Barra Depression, Djibouti, Africa
The desolate landscape of Lac Abbe, dotted with limestone chimneys, Djibouti, Africa
The desolate landscape of Lac Abbe, dotted with limestone chimneys, Djibouti, Africa
The desolate landscape of Lac Abbe, dotted with limestone chimneys, Djibouti, Africa
Perce Rock, Gaspe peninsula, province of Quebec, Canada, North America
Uluru (Ayers Rock), Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, with the Olgas in the distance, Northern Territory, Australia, Pacific
Earthquake fault line in roadcut, Interstate 40, Kingman, Arizona, United States of America, North America
A man gazing up at Wave Rock, at Hyden, Western Australia, Australia, Pacific
Archaeological site of Qumran where Dead Sea scrolls discovered in caves in cliffs, Judean Desert, Israel, Middle East
Ayers Rock, Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific
Trees in fall colours below snow covered Maroon Bell Mountains, at Aspen, Colorado, United States of America, North America
The Pu'u O'o cinder cone, the active vent on the southern flank of the Kilauea volcano, Big Island, Hawaii, Hawaiian Islands, United States of America, North America
Stone Forest, near Kunming, Yunnan, China, Asia
Rock strata in cliffs in Paria River Valley, Grand Staircase-Escalante National Monument, near Page, Arizona, United States of America, North America
Detail, The Coloured Canyon, near Nuweiba, Sinai, Egypt, North Africa, Africa
White Sands National Monument, world's largest gypsum dunefield, New Mexico, United States of America, North America
Oldonyo Lengai volcano, 2878m, Ngorongoro Conservation Area, UNESCO World Heritage Site, Tanzania, East Africa, Africa
Remarkable Rocks, Flinders Chase National Park, Kangaroo Island, South Australia, Australia, Pacific
Remarkable Rocks, Flinders Chase National Park, Kangaroo Island, South Australia, Australia, Pacific
Plane flying over sand river or lugga which may only flow with water a few days each year, Matthews Range, Kenya, East Africa, Africa
Sand patterns in water, dark volcanic sand lying just below white sand, Manuel Antonio National Park, Quepos, Costa Rica, Central America
The beach and multi-coloured cliffs at Alum Bay, accessible by chairlift, Isle of Wight, Hampshire, England, United Kingdom, Europe
Example of folding in rocks, Millook Beach, Cornwall, England, United Kingdom, Europe
Gully erosion, Kauai, Hawaii, United States of America, Pacific, North America
Fossilised bones including hind leg of Sauropod and Apatosaurus, Dinosaur National Monument, Colorado and Utah, United States of America, North America
Rift where earth is splitting at plate boundary, Grotagja, Lake Myvatn region, north east area, Iceland, Polar Regions
Solidified lava flows, El Misti volcano, 5821m, Arequipa, Peru, South America
Gordale Scar, Yorkshire Dales National Park, North Yorkshire, England, United Kingdom, Europe
Limestone pavement, Malham, Yorkshire Dales National Park, North Yorkshire, Yorkshire, England, United Kingdom, Europe
Carlsbad Caverns, Carlsbad Caverns National Park, UNESCO World Heritage Site, New Mexico, United States of America, North America
Eruption of Gunung Merapi, a highly active volcano near Yogyakarta, Java, Indonesia, Southeast Asia, Asia
The Remarkable Rocks, weathered layer remnants on a granite dome, Flinders Chase National Park, Kangaroo Island, South Australia, Australia, Pacific
Columnar structures, created during cooling of basalt lava, with an intrusion or dyke of darker rock in the foreground, near Bombo Beach, Kiama, south coast, New South Wales, Australia, Pacific
Columnar basalt lava with Fingal's Cave cut into it by sea, Staffa, off west coast of Mull, Inner Hebrides, Scotland, United Kingdom, Europe
Terraced travertine thermal pools, Pamukkale, UNESCO World Heritage Site, Anatolia, Turkey, Asia Minor, Eurasia
Terraced travertine thermal pools, Pamukkale, UNESCO World Heritage Site, Anatolia, Turkey, Asia Minor, Eurasia
Iao Needle, also known as the Phallic stone of Kanaloa, Maui, Hawaii, United States of America, Pacific
Thrombolites, a variey of microbialite or living rock that produce oxygen and deposit calcium carbonate, similar to some of the earliest fossil forms of life found on Earth, Lake Clifton, Yalgorup National Park, Mandurah, Western Australia, Australia, Pacific
The Wakhan Valley, The Pamirs, Tajikistan, Central Asia, Asia
A variety of speleothems including stalactites, stalagmites, columns, straws and drapery at Ngilgi Cave, a limestone Karst cave system near Yallingup in the South West, Augusta-Margaret River Shire, Western Australia, Australia, Pacific
Thrombolites, a variey of microbialite or living rock that produce oxygen and deposit calcium carbonate, similar to some of the earliest fossil forms of life found on Earth, Lake Clifton, Yalgorup National Park, Mandurah, Western Australia, Australia, Pacific
High Force Waterfall, 70 feet (21 m) high, Upper Teesdale, County Durham, England, United Kingdom, Europe
Tourist walks round Masaya crater, Santiago crater, Park National Volcan Masaya, Masaya, Nicaragua, Central America
Sand dunes of Maspalomas, Gran Canaria, Canary Islands, Spain, Atlantic, Europe
A girl sits in a hot river, Hveragerdi, Iceland, Polar Regions
Arenal volcano, La Fortuna, Costa Rica, Central America
Arenal volcano, La Fortuna, Costa Rica, Central America
Rock pillars formed by erosion of thick hard layer of calcrete over soft limestone, The Pinnacles Desert, Nambung National Park, near Cervantes, Dandaragan Shire, Western Australia, Australia, Pacific
Stromatolites, one of the most ancient life forms on earth, mats of micro-organisms that become rock-like structures through accretion of calcium carbonate, in highly saline lagoons like here in Lake Thetis, Cervantes, Dandaragan Shire, Western Australia, Australia, Pacific
Rock pillars formed by erosion of thick hard layer of calcrete over soft limestone, The Pinnacles Desert, Nambung National Park, near Cervantes, Dandaragan Shire, Western Australia, Australia, Pacific
The Burren and Galway Bay from Corkscrew Hill, Cappanawalla left Finvarra Point right, County Clare, West of Ireland
The Burren famous glaciated karst pavement landscape of limestone and dry stone walls, County Clare, West of Ireland
The Burren and Galway Bay from Corkscrew Hill, Cappanawalla left Finvarra Point right, County Clare, West of Ireland
Historic site medieval village ruins and 15th Century Carron Church with graveyard, County Clare, West of Ireland
Limestone pavement glaciated karst landscape and native flora in The Burren, County Clare, West of Ireland
Limestone pavement glaciated karst landscape in The Burren, County Clare, West of Ireland
Poulnabrone Portal Dolmen megalythic burial tomb, 3800BC, in The Burren glaciated landscape, County Clare, Ireland
Limestone pavement glaciated karst landscape in The Burren, County Clare, West of Ireland
Wild native flower flora and limestone pavement glaciated karst landscape in The Burren, County Clare, West of Ireland
Limestone formations and waterfall at Buttertubs on the Pass from Wensleydale to Swaldale, Yorkshire Dales, Yorkshire, England, United Kingdom, Europe
Limestone formations at Buttertubs on the Pass from Wensleydale to Swaldale, Yorkshire Dales, Yorkshire, England, United Kingdom, Europe
Meteor crater, the largest known in the world, Arizona, United States of America, North America
Chesil Beach and The Fleet Lagoon, Weymouth, Dorset, England, United Kingdom, Europe
Jokulgilskvisl valley and slopes of Kylingaskard and Nordurbarmur mountains, Landmannalaugar area, Fjallabak region, Iceland, Polar Regions
Jokulkvisl River and valley at the foot of Kerlingarfjoll Mountains, a majestic massif of rhyolitic domes, Iceland, Polar Regions
Dyrholaey inselberg and cliffs, southernmost point of Iceland, from the low-lying coast near Vik, Iceland, Polar Regions
Mount Krakatindur, 858 m, standing solitary in the Nyjahraun lava field, east of Hekla volcano in the distance, Fjallabak route north (Nyrdri-Fjallaback) in the interior, Iceland, Polar Regions
Landscape of the interior from the F-208 route (Fjallabak route north, Nyrdri-Fjallabak) between Holaskjol and Landmannalaugar, south Iceland (Sudurland), Iceland, Polar Regions
Hikers exploring the active hot spring area at Kerlingarfjoll, Iceland, Polar Regions
Fjallsarlon glacial lake and Fjallsjokull (Oraefajokull) glacier near Jokulsarlon glacial lagoon, south-east Iceland (Austurland), Iceland, Polar Regions
Hikers taking a rest above the Skaftafellsjokull glacier, Skaftafellsa glacial river in the background, in Skaftafell National Park, south-east Iceland (Austurland), Iceland, Polar Regions
Bourke's Luck Potholes, created by river erosion, Blyde River Canyon, Mpumalanga, South Africa, Africa
A hiker on Poon Hill looks towards Dhaulagiri Himal, Annapurna Conservation Area, Dhawalagiri (Dhaulagiri), Western Region, Nepal, Asia
Crater lake of Volcan Santa Ana, 2365m, Parque Nacional Los Volcanes, El Salvador, Central America
Erosion helps form stunning formations in the rocks of the Coloured Canyon, Sinai South, Egypt, North Africa, Africa
Eroded calcarenite rock (cemented coral sands) with Mount Lidgbird and Mount Gower by the lagoon with the world's most southerly coral reef, on this 10km long volcanic island in the Tasman Sea, Lord Howe Island, UNESCO World Heritage Site, New South Wales, Australia, Pacific Ocean.
Huliba limestone caves, Arikok National Park, Aruba (Dutch Antilles), West Indies, Caribbean, Central America
Hato Caves, limestone caves open to visitors on the north coast of Curacao (Dutch Antilles), West Indies, Caribbean, Central America
Devil's Marbles, the result of spheroidal weathering of strong granite beneath an ancient soil, Tennant Creek, Northern Territory, Australia, Pacific
Rio Aragon Subordan and upper Hecho valley overlooked by karst limestone peaks and woods, Huesca, Aragon, Spain, Europe
Folded layers of Jurassic sedimentary limestone and marl rocks in the cliffs at Vega beach, Ribadesella, Asturias, Spain, Europe
View from cliff tops down into Durdle Door, Jurassic Coast, UNESCO World Heritage Site, Dorset, England, United Kingdom, Europe
Chott el-Djerid, Tozeur, Tunisia, North Africa, Africa
Chott el-Djerid, Tozeur, Tunisia, North Africa, Africa
Hound Tor, Dartmoor National Park, Devon, England, United Kingdom, Europe
Waterfall in summer sunshine at Foss a Sidu, South coast, Iceland, Polar Regions