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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

Dead tree in the desert landscape with rock formations and cliffs in the background in Monument Valley, Arizona, United States of America, North America

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

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

Footpath along rock face, Xihai (West Sea) Valley, Mount Huangshan (Yellow Mountain), UNESCO World Heritage Site, Anhui Province, China, Asia

Footpath along rock face, Xihai (West Sea) Valley, Mount Huangshan (Yellow Mountain), UNESCO World Heritage Site, Anhui Province, China, Asia

Panoramic view from hot air balloon of Cappadocian landscape and hot air balloons, Cappadocia, Anatolia, Turkey, Asia Minor, Asia

Ha Long (Ha-Long) Bay, UNESCO World Heritage Site, Hong Gai, Vietnam, Indochina, Southeast Asia, Asia

Ha Long (Ha-Long) Bay, UNESCO World Heritage Site, Hong Gai, Vietnam, Indochina, Southeast Asia, Asia

Palm trees at approach to Echidna chasm, Purnululu National Park, UNESCO World Heritage Site, Bungle Bungle, Kimberley, Western Australia, Australia, Pacific

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

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

Joshua trees, Mojave yucca, just before dawn, Red Rock Canyon State Park, California, United States of America (USA), North America

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

Part of the vast crater of 10023 ft Haleakala, the world's largest dormant volcano, seen from Sliding Sands trail, Maui, Hawaii, Hawaiian Islands, United States of America (U.S.A.), North America

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

View from the Alum Cave Bluffs trail in Great Smoky Mountains National Park, UNESCO World Heritage Site, Tennessee, United States of America (U.S.A.), North America

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

The western end of Katherine Gorge in Nitmiluk National Park, where Katherine River cuts through a sandstone plateau, The Top End, Northern Territory, Australia, Pacific

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

Corniche of Cap Camarat, close to the isle of Saint Tropez, Var, Cote d'Azur, Provence, French Riviera, France, Mediterranean, Europe

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

Ruins of Inca city in morning light, Machu Picchu, UNESCO World Heritage Site, Urubamba Province, Peru, South America

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

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

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

Cala Mariolu, Cala Gonone, Golfe di Orosei (Orosei gulf), island of Sardinia, Italy, Mediterranean, Europe

Cala Mariolu, Cala Gonone, Golfe di Orosei (Orosei gulf), island of Sardinia, Italy, Mediterranean, Europe

Wave-cut arch in limestone headland, Durdle Door, Jurassic Heritage Coast, UNESCO World Heritage Site, Isle of Purbeck, Dorset, England, United Kingdom, Europe

Wave-cut platform, and chalk cliffs, Flamborough South Landing, Yorkshire, England, United Kingdom, Europe

Angel Falls from Rio Churun, Canaima National Park, UNESCO World Heritage Site, Venezuela, South America

Spectacular coastline with waterfall, Julia Pfeiffer Burns State Park, Big Sur, California, United States of America, North America

View of Praia do Conceicao beach and Morro do Pico in the background, Parque Nacional de Fernando de Norohna, Fernando de Noronha, Pernambuco, Brazil, South America

Red rock formations and jangada boat on the seafront of Canoa Quebrada, Canoa Quedrada, Ceara', Brazil, South America

Dunstanburgh Castle, a National Trust property, from Embleton Bay, Northumberland, England, United Kingdom, Europe

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

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

Thrift growing on Kingscross Point, Arran, with Holy Island beyond, Strathclyde, Scotland, United Kingdom, Europe

Sedimentary rocks, blue lias, shale-limestone sequences, Lyme Regis, Jurassic coast, UNESCO World Heritage Site, Dorset, England, United Kingdom, Europe

Sedimentary rocks, clay, colour banded by iron oxides, horizontal Triassic Chinle Clay, Blue Mesa, Painted Desert, Arizona, United States of America, North America

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

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

Third crater from the summit of Irazu, highest in Costa Rica at 3432m, last erupted 1994, Parque Nacional Volcan Irazu, Cartago, Costa Rica, Central America