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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

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

Waterfall, Milford Sound, Fiordland National Park, UNESCO World Heritage Site, Southland, South Island, New Zealand, Pacific

Waterfall, Milford Sound, Fiordland National Park, UNESCO World Heritage Site, Southland, South Island, New Zealand, Pacific

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

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

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

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

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

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

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

Skaftafellsjokull, impressive glacial tongue of the Vatnajokull ice cap in Skaftafell National Park, south-east Iceland (Austurland), Iceland, Polar Regions

Laugahraun lava field seen from the slopes of Blahnukur, Landmannalaugar area, Fjallabak region, Iceland, Europe

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

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

Rio Aragon Subordan and upper Hecho valley overlooked by karst limestone peaks and woods, Huesca, Aragon, Spain, Europe

Yaga River and karst limestone cliffs of Escuain gorge, Ordesa and Monte Perdido National Park, 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

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

River Fowey at Golitha Falls National Nature Reserve, sessile oak woodland, Bodmin Moor, Cornwall, 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

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

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

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

A steam locomotive approaching Goathland from Grosmont in September 2016, North Yorkshire, Yorkshire, England, United Kingdom, Europe

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

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

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