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Limestone rocks near the sea at sunset, The Burren, County Clare, Munster, Republic of Ireland (Eire), Europe

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

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

Dry river and beehive-like mounds in the Purnululu National Park, UNESCO World Heritage Site, Bungle Bungle mountain range, Western Australia, Australia, Pacific

Cinder cones in the centre of the island near Tinajo, a relic of the island's active volcanic past, Lanzarote, Canary Islands, Spain, Atlantic Ocean, Europe

Oxara River tumbles down the Almannagja cliff face at Oxarafoss, Thingvellir National Park, UNESCO World Heritage Site, south-west Iceland (Sudurland), Iceland, Polar Regions

Natural rock archway carved by the sea through limestone rock at Cuevas del Mar (sea caves) beach, near Llanes, Asturias, Spain, Europe

Thingvellir, site of original 10th century Althingi (Parliament) and geographical rift between Europe and North America, Iceland, Polar Regions

Close-up of the limestone terraces formed by volcanic water depositing six inches of calcium carbonate a year, Mammoth Hot Springs and Terraces, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Slot canyon in red sandstone, Antelope Canyon, near Page, Arizona, United States of America (U.S.A.), North America

The Giants Causeway, UNESCO World Heritage Site, Co. Antrim, Ulster, Northern Ireland, United Kingdom, Europe

Aerial view of the interior of the island of Kauai, including Waimea Canyon, Hawaii, United States of America, North America

Landscape typical of the region, with spectacular landslides called locally balze, Volterra, Tuscany, Italy, Europe

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

Tunnel in limestone, Chinese Temple, Sam Poh Tong, Ipoh, Perak state, Malaysia, Southeast Asia, Asia

Hverir geothermal fields at the foot of Namafjall mountain, Myvatn lake area, Iceland, Polar Regions

Views over Caradoc, Lawley and the Wrekin from the Long Mynd, Church Stretton Hills, Shropshire, England, United Kingdom, Europe

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

Lava beds surround Snaefellsjokull, an active strato volcano capped in snow and ice, on the Snaefellsnes Peninsula, North West area, Iceland, Polar Regions

Moss covered lava beds surround Snaefellsjokull, an active strato volcano capped in snow and ice, on the Snaefellsnes Peninsula, North West area, Iceland, Polar Regions

Lava dome in crater seen from rim, Mount St. Helens after 1980 eruption, with Spirit Lake and Mount Rainier in the distance, Mount St. Helens National Volcanic Monument, Washington State, United States of America (U.S.A.), North America

Castle and Sawmill Geysers in eruption in Old Faithful Geyser Basin in winter, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America (U.S.A.), North America

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

Old Man of Hoy, sandstone sea stack 137m high, with ferry in background, Hoy, Orkney Islands, Scotland, United Kingdom, Europe

Pars-kamor lighthouse, Ploumanach, Breton Corniche, Cote de Granit Rose, Cotes d'Armor, Brittany, France, Europe

St. Ninian Isle sand tombolo, connecting St. Ninian to Mainland, South Mainland, Shetland Islands, Scotland, United Kingdom, Europe

Stoura Pund cliffs and stacks of red sandstone, Eshaness, Northmavine, Shetland Islands, Scotland, United Kingdom, Europe

Hikers at 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

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

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

Gornergrat mountain range and Gorner glacier (Gornergletscher), above Zermatt in the Swiss Alps, Valais, Switzerland, Europe

Colourful patterns created by sea erosion on rocks revealed at low tide on Spittal Beach, Berwick-upon-Tweed, Northumberland on border between England and Scotland, United Kingdom, Europe

Glacier near Plaza de Mulas basecamp, Aconcagua Provincial Park, Andes mountains, Argentina, South America

Folded layers of Jurassic sedimentary limestone and marl rocks in the cliffs at Vega beach, Ribadesella, Asturias, Spain, Europe

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

Cattle grazing in a field with the Osorno volcano behind in the Lake District in Chile, South America

Faces in the rocks, Le Pere Trebeurden, at Trebeurden on the Cote de Granit Rose on the Cotes d'Amor, Brittany, France, Europe

Tourist standing on rock cliff looking at Band-I-Zulfiqar the main lake, Band-E- Amir (Bandi-Amir) (Dam of the King) crater Lakes, Bamian province, Afghanistan, Asia

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

Limestone Mogotes, Vinales Valley, UNESCO World Heritage Site, Pinar del Rio, Cuba, West Indies, Caribbean, Central America

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

Cliffs of Wadi Saydran, below Jabal Shams, abandoned village of Sap Bani Khamis is on ledges above the large overhang, high point of Jabal Akhdar mountains, northern Oman, Middle East

Gleaming white travertine terraces, nicknamed Cotton castles, Pamukkale, UNESCO World Heritage Site, Anatolia, Turkey, Asia Minor, Eurasia

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

Tourists at Valle de la Luna (Valley of the Moon), La Paz, La Paz Department, Bolivia, South America

The Grand Canyon seen from the North Rim, UNESCO World Heritage Site, Arizona, United States of America, North America

Landscape of snow-covered snow gums, mountainsand clouds, seen from Mount Buller, High Country, Victoria, Australia, Pacific

Aerial view of peak of Mount Cook, Mount Cook National Park, Southern Alps, Canterbury, South Island, New Zealand, Pacific

Steam fumaroles in geothermal field, Sol de Manana, near Laguna Colorado, Southwest Highlands, Bolivia, South America

Grand Canyon, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Hoodoos, Bryce amphitheater, Bryce Canyon National Park, Utah, United States of America (U.S.A.), North America

Grand Canyon at sunset, UNESCO World Heritage Site, Arizona, United States of America, North America

Norber erratics near Austwick, erratic boulders left on limestone pavement by erosion, Yorkshire Dales National Park, Yorkshire, England, United Kingdom, Europe