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The beach and multi-coloured cliffs at Alum Bay, accessible by chairlift, Isle of Wight, Hampshire, England, United Kingdom, Europe

Flood waters in Algerian Sahara, at edge of Grand Erg Occidental, south of El-Golea, Algeria, North Africa, Africa

Rift where earth is splitting at plate boundary, Grotagja, Lake Myvatn region, north east area, Iceland, Polar Regions

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

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

The beehive-like mounds, Purnululu National Park, UNESCO World Heritage Site, Bungle Bungle Mountain Range, 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

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

Sandy dunes at Sotovento beach, Jandia Peninsula, Fuerteventura, Canary Islands, Spain, Atlantic, Europe

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

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

Jokulgilskvisl valley and slopes of Kylingaskard and Nordurbarmur mountains, Landmannalaugar area, Fjallabak region, 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

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

Early morning mist on red sand dunes which are up to 300m high, Sossusvlei valley, Namib-Naukluft Park, Namibia, Africa

Early morning mist on red sand dunes which are up to 300m high, Sossusvlei valley, Namib-Naukluft Park, Namibia, Africa

Bourke's Luck Potholes, created by river erosion, Blyde River Canyon, Mpumalanga, South Africa, Africa

Winter Sunset at Durdle Door, Jurassic Coast, UNESCO World Heritage Site, Dorset, England, United Kingdom, Europe

A hiker on Poon Hill looks towards Dhaulagiri Himal, Annapurna Conservation Area, Dhawalagiri (Dhaulagiri), Western Region, Nepal, Asia

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

Red Arrows, Royal Air Force aerobatic display team, Peak District National Park, Derbyshire, England, United Kingdom, Europe

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

Canadian Pacific train at Morant's Curve in winter along the Bow River, Banff National Park, UNESCO World Heritage Site, Alberta, Canada, North America

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

Storm clouds move in over the reedbeds towards Cley Windmill at Cley Next the Sea, Norfolk, England, United Kingdom, Europe

The peaks of Mt. Kenya, seen from the Teleki Valley, with ranger station in foreground, Kenya, East Africa, Africa

Black Rock Cottage and Buachaille Etive Mor, Glen Coe, Argyll and Bute, Scotland, United Kingdom, Europe

View of Wulaia Bay, Isla Navarino, Murray Channel, with the Stella Australis cruise ship, Patagonia, Chile, South America

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

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

Tourist on top of Bukit Tabur Mountain overlooking Klang Gates Dam, Kuala Lumpur, Malaysia, Southeast Asia, Asia

The National Geographic Endeavour II at anchor on Bartolome Island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

Fisherman and the Green Doughnut sculpture at dawn on Brighton Seafront, Brighton, East Sussex, England, United Kingdom, Europe

Isolated cottage in the Glencoe Valley during winter snow storm, Glencoe, Highland Region, Scotland, United Kingdom, Europe

View of road through the Glencoe Valley at dusk, Glencoe, Highland Region, Scotland, United Kingdom, Europe

Woman takes pictures with smartphone during sunset party, Shirley Heights, Antigua, Antigua and Barbuda, West Indies, Caribbean, Central America

Ljubljana Castle entrance with moat and drawbridge standing on Castle Hill, Ljubljana, Slovenia, Europe

Ljubljana Castle with Slovenian flag behind the Slovenian Philharmonic building, Congress Square, Ljubljana, Slovenia Europe

Ljubljana Triple Bridge to the old town and Ljubljana Castle on Castle Hill, city centre, Ljubljana, Slovenia, Europe

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

A pine tree's roots exposed as top soil is washed away by storms, Bryce Canyon, Utah, United States of America, North America

The Old Faithful Geyser at Calistoga, erupts 60 ft high every 30 minutes, with a pressure of 1000 lbs per square foot, Napa Valley, California, United States of America, North America

The American Falls with the Horseshoe Falls behind, Niagara Falls, New York State, United States of America, North America

Steam plumes from hot lava flowing onto beach and into the ocean, Kilauea Volcano, Hawaii Volcanoes National Park, UNESCO World Heritage Site, Island of Hawaii (Big Island), Hawaii, United States of America, North America