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

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

Visitors from ice-breaker tour ship, July 14 Glacier, Krossfjorden, Spitsbergen, Svalbard, Norway, Scandinavia, Europe

View over Yedigoller Plateau from Mount Embler, Taurus Mountains, Anatolia, Turkey, Asia Minor, Eurasia

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

Reflections in still water, Jim Jim Falls and Creek, Kakadu National Park, UNESCO World HeritageSite, Northern Territory, Australia, Pacific

Isla de los Pescadores in centre, salt flats, Salar de Uyuni, Southwest Highlands, Bolivia, South America

Tiesnavy Pass with scenic rocky ridges, entrance to Vratna Dolina (Valley), the heart of hiking and skiing in Mala Fatra mountains, Mala Fatra Mountains, Slovakia, Europe

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

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

Strokkur at full height, the powerful geyser that erupts every 10 minutes, beside the now-inactive Geysir, southeast Iceland, Iceland, Polar Regions

Aerial view of Royal Jersey Golf Course, Mont Orgueil Castle (Gorey Castle), Gorey, Jersey, Channel Islands, United Kingdom, Europe

Sightseeing cruise ship at Milford Sound, Fiordland National Park, UNESCO World Heritage Site, South Island, New Zealand, Pacific

Flood plain with sand depressions, Haast River Valley, from road to Haast Pass, the start of the main divide, Haast, Westland, South Island, New Zealand, Pacific

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

Trees mark a dry riverbed or Lugga which may only flow with water for a few days each year, Matthews Range, Kenya, East Africa, Africa

People canoeing near Tham Law (tube cove), Ao Phang-Nga Marine Park, Phang Nga province, Thailand, Southeast Asia, Asia

Rio Carrao and Auyun Tepuy, Canaima National Park, UNESCO World Heritage Site, Venezuela, South America

View across Derwent Water to Keswick and Skiddaw from Watendlath road in autumn, Borrowdale, Lake District National Park, Cumbria, England, United Kingdom, Europe

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

Mount Teide (Pico del Teide) from the east, Parque Nacional de Las Canadas del Teide (Teide National Park), Tenerife, Canary Islands, Spain, Europe

The Domes, Bungle Bungle, Purnululu National Park, UNESCO World Heritage Site, Kimberley, Western Australia, Australia, Pacific

Hikers on arch rock formation in Bryce Canyon Amphitheater, Bryce Canyon National Park, Utah, United States of America, North America

Hikers on arch rock formation in Bryce Canyon Amphitheater, Bryce Canyon National Park, Utah, United States of America, North America

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

British Antarctic Survey's research vessel James Clark Ross leaving King Edward Point and Allardyce Range behind, South Georgia, Polar Regions

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

Close-up of waterfall, water cascading over rocks in the Highlands of Scotland, United Kingdom, Europe

Interior of the Gruta do Janelao, a limestone cave passage 100m high, lit through roof window, at Peruacu in Minas Gerais state, Brazil, South America

Thornton Force, Ingleton waterfalls walk, Yorkshire Dales National Park, North Yorkshire, Yorkshire, England, United Kingdom, Europe

Bridal Veil falls from Govett's Leap lookout, Grose Valley, Blue Mountains National Park, UNESCO World Heritage Site, New South Wales (N.S.W.), Australia, Pacific

Cacti on Isla de los Pescadores, and salt flats, Salar de Uyuni, Southwest Highlands, Bolivia, South America

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

Lava flow, Kilauea, Hawaii Volcanoes National Park, UNESCO World Heritage Site, Island of Hawaii (Big Island), Hawaii, United States of America, North America

The two great 13000ft volcanic peaks of Mauna Loa on right, and Mauna Kea on the Big Island seen from the top of the Haleakala volcano, Maui, Hawaii, Hawaiian Islands, United States of America, Pacific, North America

Active mud flow from line of mud volcanoes, in the Firuze crater, Gobustan, Baku, Azerbaijan, Central Asia, Asia

Valagja Gorge, a bright-coloured volcanic fissure north-east of Mount Hekla volcano, south Iceland (Sudurland), Iceland, Polar Regions

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

Ignimbrite exposed in river canyons cut since 1912 eruption, in the Valley of Ten Thousand Smokes, in Katmai Volcano National Park, Alaska, United States of America, North America

Lower Aysgarth Falls and autumn colours near Hawes, Wensleydale, Yorkshire Dales National Park, Noth Yorkshire, Yorkshire, England, United Kingdom, Europe

Cape Trinity at entrance to Eternity Bay, Saguenay River, off St. Lawrence, Quebec, Canada, North America

Rocky amphitheatre with pool, at head of Cathedral Gorge, Purnululu National Park, UNESCO World Heritage site, Bungle Bungle, Kimberley, Western Australia, Australia, Pacific

Peyto Lake, Mount Patterson and Mistaya valley, Banff National Park, UNESCO World Heritage Site, Alberta, Canada, North America