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Uluru (Ayers Rock), Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific

The Olgas (Kata Tjuta) at sunrise, Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific

Jameos del Agua lava tunnel formed in a museum of Cesar Manrique, Lanzarote, Canary Islands, Spain, Atlantic, Europe

Jameos del Agua lava tunnel formed in a museum of Cesar Manrique, Lanzarote, Canary Islands, Spain, Atlantic, Europe

The Perito Moreno Glacier, rare in that it is advancing rather than retreating, Los Glaciares National Park, UNESCO World Heritage Site, Patagonia, Argentina, South America

Isolated chalk towers, remnants of karst, Farafra Oasis, White Desert, Western Desert, Egypt, North Africa, Africa

Wild vicunas on borax mineral flats, Laguna Verde, with mineral flat margin, Southwest Highlands, Bolivia, South America

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

Manjanggul longest lava tube system in the world on the island of Jejudo, UNESCO World Heritage Site, South Korea, Asia

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

Little tourist boat ships beside a large monolith in the Avacha Bay near Petropavlovsk-Kamchatsky, Kamchatka, Russia, Eurasia

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

Blahylur crater lake in the Landmannalaugar area,Tjorvafell, 843 m in the distance, Fjallabak region, 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

The Morning Glory Pool, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Desert landscape with rock formations in Monument Valley, Arizona, United States of America, North America

View from limestone pavement across the Jamison Valley in the Blue Mountains National Park where the blue haze is caused by eucalyptus oil, near Katoomba, UNESCO World Heritage Site, New South Wales (N.S.W.), Australia, Pacific

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

Tourists walking on lava flow on Isla Santiago, Sullivan Bay, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Eruption of highly active Volcan Pacaya, a popular tourist sight south of Guatemala City, Guatemala, Central America

Desert landscape with rock formations in Monument Valley, Arizona, United States of America, North America

Remarkable Rocks, Flinders Chase National Park, Kangaroo Island, South Australia, Australia, Pacific

Laguna Verde with mineral flat margin and Volcan Licancabur, 5960m, Southwest Highlands, Bolivia, South America

Coastal sea cliffs and stacks, near Cape Wrath and Sandwood Bay, Highland region, Scotland, United Kingdom, Europe

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

Uluru (Ayers Rock), Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific

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.

The Worm's Head with causeway exposed at low tide, Rhossili, The Gower peninsula, Wales, United Kingdom, Europe

Views from the Nadab lookout, at the sacred Aboriginal site of Ubirr, Kakadu National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific

The Perito Moreno Glacier, rare in that it is advancing rather than retreating, Los Glaciares National Park, UNESCO World Heritage Site, Patagonia, Argentina, South America

Sand depressions in the flood plain of the Haast River valley at the start of the main divide, Haast, Westland, South Island, New Zealand, Pacific

Cheddar Gorge tourist attraction, limestone rock formations, Somerset, England, United Kingdom, Europe

Vulcan's Throne, the west rim, above the Colorado River, Grand Canyon, UNESCO World Heritage Site, Arizona, United States of America (USA), North America

Sof Omar cave, downstream maze, daylight in through multiple entrances, Southern Highlands, Ethiopia, Africa

Tufa towers at Lac Abhe (Abbe), formed by hot springs beneath old lake at higher level, Afar Triangle, Djibouti, Africa

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

Christie's Hole, eroded volcanic rock coast of Papa Stour (Great Island of the Priests), Shetland Islands, Scotland, United Kingdom, Europe

Malham Cove, Malham, Yorkshire Dales National Park, North Yorkshire, England, United Kingdom, Europe

Curved stalactites and wall flowstone of pure salt, in cave in Namakdan salt dome, Qeshm Island, southern Iran, Middle East

Steam rising in the Whakarewarewa Thermal Reserve in Rotorua, South Auckland, North Island, New Zealand, Pacific

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

Patterns created by sea erosion on rocks at Rumbling Kern, near Howick, Alnwick, Northumberland, England, United Kingdom, Europe

Irregular blocky lava (a'a) and cinder cones of the volcanic landscape of Timanfaya National Park, Lanzarote, Canary Islands, Spain, Atlantic Ocean, Europe

Castro de Gaviotas (Gull's fort) karst limestone rock archway, and La Canalina bay, near Llanes, Asturias, Spain, Europe

Eroded rocks under an overcast stormy sky, the Painted Desert, Arizona, United States of America (USA), 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

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

Volcanic rock formations on south eastern coast, Kleftiko, Milos, Cyclades islands, Greece, Mediterranean, Europe

Farmhouse beneath limestone scarp, Glwyseg mountain, Llangollen, Clwyd, Wales, United Kingdom, Europe

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

Basaltic cliffs dominating Raasay Sound, east coast of Skye, Trotternish, Isle of Skye, Inner Hebrides, Scotland, United Kingdom, Europe

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

Uluru (Ayers Rock), Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific