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High Force Waterfall, 70 feet (21 m) high, Upper Teesdale, County Durham, England, United Kingdom, Europe

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

Part of Stock Ghyll Force waterfall near Ambleside, Lake District National Park, Cumbria, England, United Kingdom, Europe

Dramatic autumn light on the Old Man of Storr, Isle of Skye, Inner Hebrides, Scotland, United Kingdom, Europe

Lake Atitlan from Lomas de Tzununa Hotel with San Pedro Volcano in the background, Guatemala, Central America

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

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

Rio Cares carving through karst limestone valley in the Picos de Europa mountains, near Panes, 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

The Redwall Cavern, a giant cave in the walls of the Grand Canyon, seen while rafting down the Colorado River, Grand Canyon, Arizona, United States of America, North America

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

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

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

Mount McKinley, at 20320 feet the highest peak in North America, Denali National Park, Alaska, United States of America (U.S.A.), North America

Cruise ship at Gudvangen, Naeroyfjorden, UNESCO World Heritage Site, Western Fiordlands, Norway, Scandinavia, Europe

White Cloud Scenic Area, Mount Huangshan (Yellow Mountain), UNESCO World Heritage Site, Anhui Province, China, Asia

Zodiac cruises through a natural arch of columnar basalt on the southern coast of Disko Island, Kuannersuit, Greenland, Polar Regions

Mount Ngauruhoe, 2287m, and 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

Jokulkvisl River and valley at the foot of Kerlingarfjoll Mountains, a majestic massif of rhyolitic domes, Iceland, Polar Regions

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

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

Glacier flowing from the Juneau Icefield to the proglacial lake, Alaska, United States of America, North America

View across the rim of the dormant San Fernando crater of the Volcan Masaya in the Volcan Masay National Park, Nicaragua, Central America