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Roadside building dwarfed by the Athabasca Glacier in the Jasper National Park, UNESCO World Heritage Site, Alberta, Canada, North America

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

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

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

Late winter hikers on Tongariro crossing, Mount Ngauruhoe and South Crater, Taupo, Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific

Pinnacles and rock formations known as The Silent City, seen from Inspiration Point, with snow on the ground, in the Bryce Canyon National Park, Utah, United States of America, North America

Pinnacles and rock formations caused by erosion and known as The Silent City, seen from Inspiration Point, in the Bryce Canyon National Park, Utah, United States of America, North America

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

Landscape of rice paddies, fish farms and limestone pinnacles in the Fenglin Karst south of Guilin, Yangshuo, Guangxi, China, Asia

Rock formations caused by erosion, and a solitary pine tree above the Queens Garden, in the Bryce Canyon National Park, in Utah, United States of America, North America

The Pont d'Arc, a natural rock arch over the Ardeche River, in the Ardeche Gorges, in the Ardeche region of the Rhone Alpes, France, 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

Eruptions at the Monti Calcarazzi fissure and the Piano del Lago cone on Mount Etna, that threatened tourist facilities and village in 2001, Sicily, Italy, Europe

Lava flow from the Monti Calcarazzi fissure on the flank of Mount Etna in 2001 which threatened Nicolosi below, Sicily, Italy, Europe

The Chocolate Hills, a famous geological curiosity, with over 1000 of them, on the island of Bohol, the Philippines, Southeast Asia, Asia

Detail from the dramatic landscape of the Painted Hills, where rapid erosion has shaped colourful mineral-rich clays, John Day Fossil Beds National Monument, Oregon, United States of America, North America

Tiny figures show scale of the Deer cave looking back to mouth of the Deer cave, Mulu National Park, Sarawak, island of Borneo, Malaysia, Southeast Asia, Asia

The perfect cone of Volcan Concepcion, 1610m, one of two volcanoes that make up the island of Omotepe, Nicaragua, Central America

Eruption of highly active Volcan Pacaya, a popular tourist sight south of Guatemala City, Guatemala, Central America

Eruption of highly active Volcan Pacaya, a popular tourist sight south of Guatemala City, Guatemala, Central America

Eruption of highly active Volcan Pacaya, a popular tourist sight south of Guatemala City, Guatemala, Central America

Spectacular limestone outcrops and forested valleys of Zhangjiajie Forest Park in Wulingyuan Scenic Area in Hunan Province, UNESCO World Heritage Site, China, Asia

Bubbling mud pot in the Whakarewarewa thermal area at Rotorua, South Auckland, North Island, New Zealand, Pacific

People walking near floating icebergs, Lago Gray (Lake Gray), Torres del Paine National Park, Patagonian Andes, Patagonia, Chile, South America

People walking near floating icebergs, Lago Gray (Lake Gray), Torres del Paine National Park, Patagonian Andes, Patagonia, Chile, South America

People kayaking near floating icebergs, Lago Gray (Lake Gray), Torres del Paine National Park, Patagonian Andes, Patagonia, Chile, South America

Person kayaking between floating icebergs, Lago Gray (Lake Gray), Torres del Paine National Park, Patagonian Andes, Patagonia, Chile, South America

Aerial view of Lake Gray (Lago Gray) glacier, Torres del Paine National Park, Patagonia, Chile, South 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

Pia Glacier, Beagle Channel, Darwin National Park, Tierra del Fuego, Patagonia, Chile, South America

Ong Jmal (the camel's neck), desert and site of Star Wars and The English Patient films, near Nefta, Tunisia, North Africa, Africa

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

Melt water and glacial rock terrain at glacier terminus, Waiho River, Franz Joseph Glacier, Westland National Park, South Island, New Zealand, Pacific

Looking towards the eastern escarpment of Wilpena Pound, a huge natural basin in the Flinders Ranges National Park, South Australia, Australia, Pacific

Perfect example of strato-volcano, island cone left by subsidence, Crater Lake, Oregon, United States of America (U.S.A.), North America

Route from Andalsnes to Geiranger, Trollstigen Road, Western Fiordlands, Norway, Scandinavia, Europe

Landscape of volcanic hills, looking towards Taiaroa Head, Albatross, near Dunedin, Otago Peninsula, Otago, South Island, New Zealand, Pacific

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

Looking out through entrance of cave, Deer Cave, Gunung Mulu National Park, UNESCO World Heritage Site, Sarawak, island of Borneo, Malaysia, Southeast Asia, Asia

Champagne Pools steaming, Waiotapu thermal reserve, Rotorua, South Auckland, North Island, New Zealand, Pacific

Part of the 300m Wentworth Falls on the great cliff face in the Blue Mountains, UNESCO World Heritage Site, east of Katoomba, New South Wales (N.S.W.), Australia, Pacific

Upper Yosemite Falls cascades down the sheer granite walls of Yosemite Valley, the world's longest unbroken fall, with the famous 8842 ft Half Dome in the distance, Yosemite National Park, UNESCO World Heritage Site, California, United States of America (U.S.A.), North America

Eucalyptus oil haze causes the blueness above the dense gum tree forest in the Jamison Valley in the Blue Mountains National Park, UNESCO World Heritage Site, south of Katoomba, New South Wales (N.S.W.), Australia, Pacific

Masai cattle after rain, Ngorongoro crater, Ngorongoro Conservation Area, UNESCO World Heritage Site, Tanzania, East Africa, Africa

Frank Slide, where giant rockfall occurred in 1903, limestone debris fell 400m, Alberta, Canada, North America

Sinkhole Plain, polygonal doline karst, near Mammoth Cave, Kentucky, United States of America, North America

Lonar meteorite crater, world's only impact crater in basalt, Deccan plateau, Maharashtra, India, Asia

Part of the North Unit of Badlands National Park, carved out of the prairies by rapid water erosion of sediments, South Dakota, United States of America, North America

Colourful volcanic rocks of the Andes mountains, along Bolivia-Chile border range, Southwest Highlands, Bolivia, South America

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

Zanskar River valley between Himalaya and Zanskar mountains seen from Leh-Manali highway, Ladakh, India, Asia

Montane grasslands with cattle grazing in front of Bale Mountains, Southern Highlands, Ethiopia, Africa

Tufa towers at Lac Abhe (Abbe), formed by hot springs beneath old lake at higher level, Afar Triangle, Djibouti, Africa