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Eruption of Gunung Merapi, a highly active volcano near Yogyakarta, Java, Indonesia, Southeast Asia, Asia

Erosion helps form stunning formations in the rocks of the Coloured Canyon, Sinai South, Egypt, North Africa, Africa

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

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

Aerial view of La Graciosa Island volcanoes from El Mirador del Rio, Lanzarote, Canary Islands, Spain, Atlantic, Europe

The Pu'u O'o cinder cone, the active vent on the southern flank of the Kilauea volcano, Big Island, Hawaii, Hawaiian Islands, 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

Band-i-Zulfiqar, the main lake at Band-E-Amir (Dam of the King), Afghanistan's first National Park set up in 1973 to protect the five lakes, believed by locals to have been created by the Prophet Mohammed's son-in-law Ali, making them a place of pilgrimage, Afghanistan, Asia

Folded limestone and shale, Jurassic period, Stair Hole, Lulworth, Dorset, England, United Kingdom, Europe

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 pavement at Lea Green, Grassington, Yorkshire Dales National Park, North Yorkshire, England, United Kingdom, Europe

Columnar basalt lava with Fingal's Cave cut into it by sea, Staffa, off west coast of Mull, Inner Hebrides, Scotland, United Kingdom, Europe

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

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 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

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

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

The Chocolate Hills of Bohol, famous geological curiosity, of which there are over 1000, Bohol, Philippines, Southeast Asia, Asia

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

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

Lewisian gneiss, one of the oldest rocks on earth formed 2 billion years ago, Isle of Lewis, Outer Hebrides, Scotland, United Kingdom, Europe

Terraced travertine thermal pools, Pamukkale, UNESCO World Heritage Site, Anatolia, Turkey, Asia Minor, Eurasia

Iao Needle, also known as the Phallic stone of Kanaloa, Maui, Hawaii, United States of America, 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

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

Manjanggul longest lava tube system in the world on the island of Jejudo, UNESCO World Heritage Site, South Korea, Asia

Plane flying over sand river or lugga which may only flow with water a few days each year, Matthews Range, Kenya, East Africa, Africa

Little tourist boat ships beside a large monolith in the Avacha Bay near Petropavlovsk-Kamchatsky, Kamchatka, Russia, Eurasia

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

Fjallsarlon glacial lake and Fjallsjokull (Oraefajokull) glacier near Jokulsarlon glacial lagoon, south-east Iceland (Austurland), Iceland, Polar Regions

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

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

View from limestone pavement across the Jamison Valley in the Blue Mountains National Park where the blue haze is caused by eucalyptus oil, near Katoomba, UNESCO World Heritage Site, New South Wales (N.S.W.), Australia, Pacific

Vulcan's Throne, the west rim, above the Colorado River, Grand Canyon, UNESCO World Heritage Site, Arizona, United States of America (USA), North America

Wild vicunas on borax mineral flats, Laguna Verde, with mineral flat margin, Southwest Highlands, Bolivia, South America

Cooled lava from recent eruption, Kilauea Volcano, Hawaii Volcanoes National Park, UNESCO World Heritage Site, Island of Hawaii (Big Island), Hawaii, United States of America, North America

Basaltic cliffs dominating Raasay Sound, east coast of Skye, Trotternish, Isle of Skye, Inner Hebrides, Scotland, United Kingdom, Europe

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

Eroded rocks under an overcast stormy sky, the Painted Desert, Arizona, United States of America (USA), North America

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

Close-up of coloured sandstone from which the Nabateans carved their city, Petra, Jordan, Middle East

The crater on Vulcano, Aeolian Islands, UNESCO World Heritage Site, island of Sicily, Italy, Mediterranean, Europe

Coastal sea cliffs and stacks, near Cape Wrath and Sandwood Bay, Highland region, Scotland, United Kingdom, Europe

Manjanggul longest lava tube system in the world on the island of Jejudo, UNESCO World Heritage Site, South Korea, Asia

Hikers near Emerald Lakes on the Tongariro Crossing, Tongariro National Park, UNESCO World Heritage Site, the oldest national park in New Zealand, Taupo Volcanic Zone, North Island, New Zealand, Pacific

Scree slope and limestone vale, near Conistone, Yorkshire Dales National Park, North Yorkshire, England, United Kingdom, Europe

White Sands National Monument, world's largest gypsum dunefield, New Mexico, United States of America, North America

Fossilised bones including hind leg of Sauropod and Apatosaurus, Dinosaur National Monument, Colorado and Utah, United States of America, North America

A general view of the Athabasca Glacier, a six kilometre tongue of ice flowing from the Columbia Icefield. It is the best-known glacier in the Canadian Rockies and is situated in Jasper National Park, Alberta, Canada.

Cueva de Los Verdes, cave tourist attraction in lava pipe tunnel, Lanzarote, Canary Islands, Spain, Atlantic, Europe

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

The Worm's Head with causeway exposed at low tide, Rhossili, The Gower peninsula, Wales, United Kingdom, Europe

Desert landscape with rock formations in Monument Valley, Arizona, United States of America, North America

Old Faithful Geyser, erupts 60ft every 30 minutes, with pressure of 1000lbs per square foot, Napa Valley, California, United States of America (USA), North America

Beach, white chalk cliffs, stacks and arches, Whitianga, Coromandel Peninsula, South Auckland, North Island, New Zealand, Pacific

Part of Nourlangie Rock, sacred aboriginal shelter and rock art site, Kakadu National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific

Christie's Hole, eroded volcanic rock coast of Papa Stour (Great Island of the Priests), Shetland Islands, Scotland, United Kingdom, Europe

Malham Cove, Malham, Yorkshire Dales National Park, North Yorkshire, England, United Kingdom, Europe

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