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Castle Geyser, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America (U.S.A.), North America
Fairy chimney rock formations, Cappadocia, Anatolia, Turkey, Asia Minor, Asia
Isla de los Pescadores in centre, salt flats, Salar de Uyuni, Southwest Highlands, Bolivia, South America
Afzgar Arch, Akakus, Sahara desert, Fezzan, Libya, North Africa, Africa
Close-up of coloured sandstone from which the Nabateans carved their city, Petra, Jordan, Middle East
Travertine terraces, Pamukkale, UNESCO World Heritage Site, Anatolia, Turkey, Asia Minor, Asia
Roque Nublo (mountain peak), near Ayacata, Gran Canaria, Canary Islands, Spain, Atlantic, Europe
The Giants Causeway, UNESCO World Heritage Site, Co. Antrim, Ulster, Northern Ireland, United Kingdom, Europe
Manjanggul longest lava tube system in the world on the island of Jejudo, UNESCO World Heritage Site, South Korea, Asia
Eshaness basalt cliffs, Calder's Geo, ancient volcanic crater, coast deeply eroded with caves, blowholes and stacks, Northmavine, Shetland Islands, Scotland, United Kingdom, Europe
Red sand dunes, up to 300m, Sossusvlei, Namib-Naukluft Desert Park, Namibia, Africa
Uluru (Ayers Rock), Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific
Coastline from Eleug Stacks, Pembrokeshire, Wales, United Kingdom, Europe
Bhimbetka Caves with Neolithic paintings in rock shelters in sandstone, Obaidullaganj hills, Bhopal, Madhya Pradesh, India, Asia
Ait Ben-Haddou, Morocco, North Africa, Africa
Valagja Gorge, a bright-coloured volcanic fissure north-east of Mount Hekla volcano, south Iceland (Sudurland), Iceland, Polar Regions
Hot air ballooning over rock formations, Cappadocia, Anatolia, Turkey, Asia Minor, Asia
Giants Causeway, UNESCO World Heritage Site, County Antrim, Ulster, Northern Ireland, United Kingdom, Europe
Leirhnjukur thermal area and eruption site, near Krafla geothermal power station, Lake Myvatn, North area, Iceland, Polar Regions
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
Batu Caves, near Kuala Lumpur, Malaysia, Southeast Asia, Asia
Devils Punchbowl Falls, 131m high, on walking track in mountain beech forest, Arthur's Pass National Park, Southern Alps, Westland, South Island, New Zealand, Pacific
Peyto Lake, Mount Patterson and Mistaya valley, Banff National Park, UNESCO World Heritage Site, Alberta, Canada, North America
Rock formations and coastline near Canoa Quebrada, Canoa Quedrada, Ceara', Brazil, South America
Phallic pillars or fairy chimneys, near Goreme, Cappadocia, Anatolia, Turkey, Asia Minor, Eurasia
Natural rock arch, desert scenery, Wadi Rum, Jordan, Middle East
Lava flow, Kilauea, Hawaii Volcanoes National Park, UNESCO World Heritage Site, Island of Hawaii (Big Island), Hawaii, United States of America, North America
Aerial view of the interior of the island of Kauai, including Waimea Canyon, Hawaii, United States of America, North America
Manjanggul longest lava tube system in the world on the island of Jejudo, UNESCO World Heritage Site, South Korea, Asia
Limestone rocks near the sea at sunset, The Burren, County Clare, Munster, Republic of Ireland (Eire), Europe
The Olgas, Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific
Mountain landscape of the Hindu Kush, Wakhan corridor, Afghanistan, Asia
Sand dunes of Maspalomas and seaside, Gran Canaria, Canary Islands, Spain, Atlantic, Europe
Strokkur at full height, the powerful geyser that erupts every 10 minutes, beside the now-inactive Geysir, southeast Iceland, Iceland, Polar Regions
Landscape of the Swat River valley in Pakistan, Asia
Walkers on a narrow mountain road above the Cares Gorge, 1000m deep, 12km limestone gorge, in the Picos de Europa mountains in Cantabria, Spain, Europe
Rocky amphitheatre with pool, at head of Cathedral Gorge, Purnululu National Park, UNESCO World Heritage site, Bungle Bungle, Kimberley, Western Australia, Australia, Pacific
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
The world's longest dinosaur tracks, Cretaceous Titanosaurus, near Sucre, Bolivia, South America
Slea Head, Dingle Peninsula, County Kerry, Munster, Republic of Ireland (Eire), Europe
People canoeing near Tham Law (tube cove), Ao Phang-Nga Marine Park, Phang Nga province, Thailand, Southeast Asia, Asia
Coastal rock formations, Yehliu, Taipei County, Taiwan, Asia
Plumes of steam where the lava reaches the sea, Kilauea Volcano, Hawaii Volcanoes National Park, UNESCO World Heritage Site, Island of Hawaii (Big Island), Hawaii, United States of America, Pacific, North America
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
Landscape typical of the region, with spectacular landslides called locally balze, Volterra, Tuscany, Italy, Europe
Eruption of Castle Geyser with thermophilic bacterica mats in foreground, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
The Twelve Apostles, on the Great Ocean Road, Victoria, 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
Ancient prehistoric stone boulder and bare limestone pavement, The Burren, County Clare, West of Ireland
Cueva de Los Verdes, cave tourist attraction in lava pipe tunnel, Lanzarote, Canary Islands, Spain, Atlantic, Europe
Granite rocks at Ile de Coco, Seychelles, Indian Ocean, Africa
Natural rock archway carved by the sea through limestone rock at Cuevas del Mar (sea caves) beach, near Llanes, Asturias, Spain, Europe
Views over Caradoc, Lawley and the Wrekin from the Long Mynd, Church Stretton Hills, Shropshire, England, United Kingdom, Europe
Underground lake in the Salt Mine, Salina Turda museum in Transylvania, Romania, Europe
Thingvellir, site of original 10th century Althingi (Parliament) and geographical rift between Europe and North America, Iceland, Polar Regions
Cascade Terrace at Orakei Korako Thermals in the North Island of New Zealand, Pacific
Lasta Valley, Wollo region, Ethiopia, Africa
Cacti on Isla de los Pescadores, and salt flats, Salar de Uyuni, Southwest Highlands, Bolivia, South America
Coastline near Canoa Quebrada, Canoa Quedrada, Ceara', Brazil, South America
Coastal rock formations, Yehliu, Taipei County, Taiwan, Asia
Flamborough Head, East Yorkshire, Yorkshire, England, United Kingdom, Europe
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
Faraglioni Rocks, Capri, Campania, Italy, Mediterranean, Europe
Tourist standing on rock cliff looking at Band-I-Zulfiqar the main lake, Band-E- Amir (Bandi-Amir) (Dam of the King) crater Lakes, Bamian province, Afghanistan, 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
Arenal volcano, La Fortuna, Costa Rica, Central America
Arenal volcano, La Fortuna, Costa Rica, Central America
Visitors at an active andesite stratovolcano on White Island, North Island, New Zealand, 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
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
Cinder cones in the centre of the island near Tinajo, a relic of the island's active volcanic past, Lanzarote, Canary Islands, Spain, Atlantic Ocean, Europe
Natural Bridges National Monument, Sipapu Bridge, Utah, United States of America, North America
Severe erosion of loose Quaternary glacial sands on this coast that has retreated more than 500m since the1830s, Covehithe, Suffolk, England, United Kingdom, Europe
The Siq, Petra, UNESCO World Heritage Site, Jordan, Middle East
Fingal's Cave, Isle of Staffa, Inner Hebrides, Scotland, United Kingdom, Europe
Cattle grazing in a field with the Osorno volcano behind in the Lake District in Chile, South America
The Grand Canyon seen from the North Rim, UNESCO World Heritage Site, Arizona, United States of America, North America
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
Under the glacier, Perito Moreno, Argentina, South America
Sand dunes, Erg Murzuq, Sahara desert, Fezzan, Libya, North Africa, Africa
Valley of Goreme, central Cappadocia, Anatolia, Turkey, Asia Minor, Asia
Valley of Goreme, central Cappadocia, Anatolia, Turkey, Asia Minor, Asia
Coastal rock formations, Yehliu, Taipei County, Taiwan, Asia
Grand Canyon, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
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
Norber erratics near Austwick, erratic boulders left on limestone pavement by erosion, Yorkshire Dales National Park, Yorkshire, England, United Kingdom, Europe
St. Ninian Isle sand tombolo, connecting St. Ninian to Mainland, South Mainland, Shetland Islands, Scotland, United Kingdom, Europe
Hikers at Red Crater 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
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
One of many picturesque waterfalls in the valley of the Rio Pastaza that flows from the Andes to the upper Amazon Basin, near Banos, Ambato Province, Central Highlands, Ecuador, South America
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
Gornergrat mountain range and Gorner glacier (Gornergletscher), above Zermatt in the Swiss Alps, Valais, Switzerland, Europe