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The crater on Vulcano, Aeolian Islands, UNESCO World Heritage Site, island of Sicily, Italy, Mediterranean, Europe
Limestone Stone Forest, near Kunming, Yunnan province, China, Asia
Da Nort Bank, natural arches and cliffs, Foula, Shetland Islands, Scotland, United Kingdom, Europe
Perce Rock, Gaspe peninsula, province of Quebec, Canada, North America
The Pinnacles, Nambung National Park, Cervantes, Western Australia, Australia, Pacific
White Sands National Monument, world's largest gypsum dunefield, New Mexico, United States of America, North America
Fossilised bones including hind leg of Sauropod and Apatosaurus, Dinosaur National Monument, Colorado and Utah, United States of America, North America
Little tourist boat ships beside a large monolith in the Avacha Bay near Petropavlovsk-Kamchatsky, Kamchatka, Russia, Eurasia
Eruption of highly active Volcan Pacaya, a popular tourist sight south of Guatemala City, Guatemala, Central America
Fissure vent with spatter cones, Laki Volcano, Iceland, Polar Regions
Coastline near Canoa Quebrada, Canoa Quedrada, Ceara'. Brazil, South America
Coastal rock formations, Yehliu, Taipei County, Taiwan, Asia
Beachy Head, East Sussex, England, United Kingdom, Europe
Third crater from the summit of Irazu, highest in Costa Rica at 3432m, last erupted 1994, Parque Nacional Volcan Irazu, Cartago, Costa Rica, Central America
Manjanggul longest lava tube system in the world on the island of Jejudo, UNESCO World Heritage Site, South Korea, Asia
Hikers near Emerald Lakes on the Tongariro Crossing, Tongariro National Park, UNESCO World Heritage Site, the oldest national park in New Zealand, Taupo Volcanic Zone, North Island, New Zealand, Pacific
Scree slope and limestone vale, near Conistone, Yorkshire Dales National Park, North Yorkshire, England, United Kingdom, Europe
Plane flying over sand river or lugga which may only flow with water a few days each year, Matthews Range, Kenya, East Africa, Africa
Rockfalls from red and white chalk cliff, Hunstanton, Norfolk, England, United Kingdom, Europe
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
In the red tsingy area, close to Diego Suarez bay, Northern Madagascar, Africa
Vulcan's Throne, the west rim, above the Colorado River, Grand Canyon, UNESCO World Heritage Site, Arizona, United States of America (USA), North America
Remarkable Rocks, Flinders Chase National Park, Kangaroo Island, South Australia, Australia, Pacific
Sof Omar cave, downstream maze, daylight in through multiple entrances, Southern Highlands, Ethiopia, Africa
Valley of Goreme, central Cappadocia, Anatolia, Turkey, Asia Minor, Asia
Coastal sea cliffs and stacks, near Cape Wrath and Sandwood Bay, Highland region, Scotland, United Kingdom, Europe
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
Malham Cove, Malham, Yorkshire Dales National Park, North Yorkshire, England, United Kingdom, Europe
Steam rising in the Whakarewarewa Thermal Reserve in Rotorua, South Auckland, North Island, New Zealand, Pacific
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
Landscape of the interior from the F-208 route (Fjallabak route north, Nyrdri-Fjallabak) between Holaskjol and Landmannalaugar, south Iceland (Sudurland), Iceland, Polar Regions
Chott el-Djerid, Tozeur, Tunisia, North Africa, Africa
The Worm's Head with causeway exposed at low tide, Rhossili, The Gower peninsula, Wales, United Kingdom, Europe
The Lady Knox Geyser in the Waiotapu Thermal Area at Rotorua, North Island, New Zealand, Pacific
Late winter hikers on Tongariro crossing, Mount Ngauruhoe and South Crater, Taupo, Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific
Desert landscape with rock formations in Monument Valley, Arizona, United States of America, North America
Zanskar River, Ladakh, Indian Himalayas, India, Asia
Eroded rocks under an overcast stormy sky, the Painted Desert, Arizona, United States of America (USA), North America
Beach, white chalk cliffs, stacks and arches, Whitianga, Coromandel Peninsula, South Auckland, North Island, New Zealand, Pacific
Champagne Pools steaming, Waiotapu thermal reserves, Rotorua, South Auckland, North Island, New Zealand, Pacific
Lonar meteorite crater, world's only impact crater in basalt, Deccan plateau, Maharashtra, India, Asia
Wild vicunas on borax mineral flats, Laguna Verde, with mineral flat margin, Southwest Highlands, Bolivia, South America
Laguna Verde, Salar de Uyuni, Bolivia, South America
Travertine terraces, Pamukkale, UNESCO World Heritage Site, Anatolia, Turkey, Asia Minor, Asia
Remarkable Rocks, Kangaroo Island, South Australia, Australia, Pacific
Christie's Hole, eroded volcanic rock coast of Papa Stour (Great Island of the Priests), Shetland Islands, Scotland, United Kingdom, Europe
Mount Kenya Tarn with Gorges Valley in the background, Kenya, East Africa, Africa
Solidified lava flows, El Misti volcano, 5821m, Arequipa, Peru, South America
Irazu volcano, Irazu Volcano National Park, Cartago Province, Costa Rica, Central America
A general view of the Athabasca Glacier, a six kilometre tongue of ice flowing from the Columbia Icefield. It is the best-known glacier in the Canadian Rockies and is situated in Jasper National Park, Alberta, Canada.
Blahylur crater lake in the Landmannalaugar area,Tjorvafell, 843 m in the distance, Fjallabak region, Iceland, Polar Regions
Hikers exploring the very active hot spring area at Kerlingarfjoll, where Kerlingarfjoll Mountains in the interior are a massif of rhyolitic domes rising to 1477m, Iceland, Polar Regions
Hiker on walkway admires the creek in the narrow limestone gorge, Aare Gorge, Bernese Oberland, Canton of Berne, Switzerland, Europe
Diana Point, Al Jabal Al Akkar region, Hajar Mountains, Sultanate of Oman, Middle East
Castle Geyser, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America (U.S.A.), North America
Old Faithful Geyser, erupts 60ft every 30 minutes, with pressure of 1000lbs per square foot, Napa Valley, California, United States of America (USA), North America
Volcanic rock formations on south eastern coast, Kleftiko, Milos, Cyclades islands, Greece, Mediterranean, Europe
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
Valley of Goreme, central Cappadocia, Anatolia, Turkey, Asia Minor, Asia
Red rock formations and jangada boat on the seafront of Canoa Quebrada, Canoa Quedrada, Ceara', Brazil, South America
Mount Fuji (3776m), Owakidani geothermal park, Hakone, Honshu Island, Japan, Asia
Waterfall with wet rocks and pebbles taken from beach, Cornwall, England, United Kingdom, Europe
The Giants Causeway, UNESCO World Heritage Site, Co. Antrim, Ulster, Northern Ireland, United Kingdom, Europe
Different coloured rocks in the Red Valley, Orthaisar, Cappadocia, Anatolia, Turkey, Eurasia
Manjanggul longest lava tube system in the world on the island of Jejudo, UNESCO World Heritage Site, South Korea, Asia
Hikers near Emerald Lakes on the Tongariro Crossing, Tongariro National Park, UNESCO World Heritage Site, the oldest national park in New Zealand, Taupo Volcanic Zone, North Island, New Zealand, Pacific
Limestone plateau, karstic landscape, Burren region, County Clare, Munster, Republic of Ireland, Europe
Basaltic cliffs dominating Raasay Sound, east coast of Skye, Trotternish, Isle of Skye, Inner Hebrides, Scotland, United Kingdom, Europe
Limestone plateau at sunset, karstic landscape, Burren region, County Clare, Munster, Republic of Ireland, Europe
Uluru (Ayers Rock), Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific
Remarkable Rocks, Flinders Chase National Park, Kangaroo Island, South Australia, Australia, Pacific
Bhimbetka Caves with Neolithic paintings in rock shelters in sandstone, Obaidullaganj hills, Bhopal, Madhya Pradesh, India, Asia
Limestone outcrop showing classic cross bedding created by ancient dune sands, at Hamelin Bay on the coast north of Cape Leeuwin at the south western tip of Australia, Augusta-Margaret River Shire, Western Australia, Australia, Pacific
Irregular blocky lava (a'a) and cinder cones of the volcanic landscape of Timanfaya National Park, Lanzarote, Canary Islands, Spain, Atlantic Ocean, Europe
Lava flows in lake Frostadavatn, Landmannalaugar area, Fjallabak region, Iceland, Polar Regions
Lac Abbe (Lake Abhe Bad) with its chimneys, Republic of Djibouti, Africa
Uluru (Ayers Rock), Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific
Pastel shades of pebbly beach at Bossington in Somerset, England, United Kingdom, Europe
Visitors from ice-breaker tour ship, July 14 Glacier, Krossfjorden, Spitsbergen, Svalbard, Norway, Scandinavia, Europe
Te Horo rock, Cathedral Cove, Coromandel Peninsula, North Island, New Zealand, Pacific
Desert landscape with rock formations in Monument Valley, Arizona, United States of America, North America
Batu Caves, near Kuala Lumpur, Malaysia, Southeast Asia, Asia
Isla de los Pescadores in centre, salt flats, Salar de Uyuni, Southwest Highlands, Bolivia, South America
Travertine terraces, Pamukkale, UNESCO World Heritage Site, Anatolia, Turkey, Asia Minor, Asia
Coastal rock formations, Yehliu, Taipei County, Taiwan, Asia
Aerial view of the interior of the island of Kauai, including Waimea Canyon, Hawaii, United States of America, North America
Hiking trail and rocky peaks on Cradle Mountain on the Overland Track, Cradle Mountain Lake St. Clair National Park, part of Tasmanian Wilderness, UNESCO World Heritage Site, Tasmania, Australia, Pacific
Coastline from Eleug Stacks, Pembrokeshire, Wales, United Kingdom, Europe
Sand dunes of Maspalomas and seaside, Gran Canaria, Canary Islands, Spain, Atlantic, Europe
Patterns created by sea erosion on rocks at Rumbling Kern, near Howick, Alnwick, Northumberland, England, United Kingdom, Europe
Ait Ben-Haddou, Morocco, North Africa, Africa
Natural Bridges National Monument, Sipapu Bridge, Utah, United States of America, North America
Strokkur at full height, the powerful geyser that erupts every 10 minutes, beside the now-inactive Geysir, southeast Iceland, Iceland, Polar Regions
Columnar basalt, Vikingbukta (Viking Bay), Scoresbysund, Northeast Greenland, Polar Regions
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
Farmhouse beneath limestone scarp, Glwyseg mountain, Llangollen, Clwyd, Wales, United Kingdom, Europe
Fairy chimney rock formations, Cappadocia, Anatolia, Turkey, Asia Minor, Asia
The world's longest dinosaur tracks, Cretaceous Titanosaurus, near Sucre, Bolivia, South America
Tufa towers at Lac Abhe (Abbe), formed by hot springs beneath old lake at higher level, Afar Triangle, Djibouti, Africa