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Sipapu Natural Bridge, Natural Bridges National Monument, Utah, United States of America, North America
The Pinnacles limestone formations at sunset contained within Nambung National Park, Western Australia, Australia, Pacific
Perito Moreno Glacier, Los Glaciares National Park, UNESCO World Heritage Site, Patagonia, Argentina, South America
South Window Arch seen through Turret Arch, Arches National Park, Utah, United States of America, North America
Valle de la Luna (Valley of the Moon), Atacama Desert, Chile, South America
Kayaking and rafting down the Colorado River, Castle Valley, near Moab, Utah, United States of America, North America
Woman standing on a giant arch near Moab, Utah, United States of America, North America
Long tail boats on Poda Island in Ao Nang, Krabi, Thailand, Southeast Asia, Asia
Arches National Park, Moab, Utah, United States of America, North America
Bryce Canyon National Park, Utah, United States of America, North America
Bryce Canyon National Park, Utah, United States of America, North America
Bryce Canyon National Park, Utah, United States of America, North America
Bryce Canyon National Park, Utah, United States of America, North America
The Chimney, Capitol Reef National Park, Utah, United States of America, North America
Camping below Vilyuchinsk volcano, Kamchatka, Russia, Eurasia
Left and Right Mittens, Monument Valley Navajo Tribal Park, Arizona, United States of America, North America
Walkway through cold lava in the Craters of the Moon National Park, Idaho, United States of America, North America
El Tatio Geysers, Atacama Desert, Chile, South America
Stone wall of the Window section, Arches National Park, Utah, United States of America, North America
View over the sandstone cliffs of the Grand Staircase Escalante National Monument, Utah, United States of America, North America
Sunset over Grand Canyon South Rim, UNESCO World Heritage Site, Arizona, United States of America, North America
Hoodoos and cliffs with snow lit by late afternoon sun, from Rim Trail near Sunset Point, Bryce Canyon National Park, Utah, United States of America, North America
Redrock Sandstone formations at sunrise in the Valley of Fire State Park, Nevada, United States of America, North America
Zion National Park, Utah, United States of America, North America
Bryce Canyon National Park, Utah, United States of America, North America
Little creek and the Tolbachik volcano, Kamchatka, Russia, Eurasia
The Pinnacles limestone formations at sunset in Nambung National Park, Western Australia, Australia, Pacific
Zion National Park, Utah, United States of America, North America
Punaluu Black Sand Beach on Big Island, Hawaii, United States of America, Pacific
Eroded curves in sandstone, Upper Antelope Canyon, near Page, Arizona, United States of America, North America
Delicate Arch, Arches National Park, Moab, Utah, United States of America, North America
Bryce Canyon National Park, Utah, United States of America, North America
Hummer driving on the Slickrock trail, Moab, Utah, United States of America, North America
Park Avenue, Arches National Park, Moab, Utah, United States of America, North America
Remarkable Rocks, Flinders Chase National Park, Kangaroo Island, South Australia, Australia, Pacific
Hikers on trail, High Tatras Mountains (Vyoske Tatry), Tatra National Park, Slovakia, Europe
Patterns in sand dunes in Erg Chebbi sand sea, Sahara Desert, near Merzouga, Morocco, North Africa, Africa
Sand dunes in Erg Chebbi sand sea, Sahara Desert, near Merzouga, Morocco, North Africa, Africa
Sand dunes in Erg Chebbi sand sea, Sahara Desert, near Merzouga, Morocco, North Africa, Africa
Sand dunes in Erg Chebbi sand sea, Sahara Desert, near Merzouga, Morocco, North Africa, Africa
Close-up of sand dunes in Erg Chebbi sand sea, Sahara Desert, near Merzouga, Morocco, North Africa, Africa
Old millstones left at quarried edge of gritstone (millstone grit), Stanage Edge, Peak District National Park, Derbyshire, England, United Kingdom, Europe
Cracked earth and cattle skull in the Outback of South Australia, Australia, Pacific
Carlsbad Caverns, Carlsbad Caverns National Park, UNESCO World Heritage Site, New Mexico, United States of America, North America
The desert at Wadi Rum, Jordan, Middle East
Church Doors rock formation in Skrinkle Haven cove with surf washing over the rocks, Lydstep, Pembrokeshire, Wales, United Kingdom, Europe
Line of trees near Stok, Ladakh, India, Asia
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 Seven Colours mountain at Purmamaca near Tilcara in Argentina, South America
Salt pans in marshes, Ile de Re (Island of Re), Poitou Charentes, France, Europe
Spitzkoppe, 1728m, between Windhoek and Shakapmund, Damaraland, Namibia, Africa
Sand dune and tree near Sesriem, Namib Naukluft park, Namibia, Africa
Rocks along the coastline in the Acadia National Park, Maine, New England, United States of America, North America
Rock arches known as the Faraglioni Stacks off the coast of the island of Capri, Campania, Italy, Europe
Hole in the Wall, Coffee Bay, Transkei, Wild Coast, South Africa, Africa
Rock tombs in sandstone inselberg, Mada'in Salih, Saudi Arabia, Middle East
Landscape of the Yellow River, farm land and hills in Qinghai, China, Asia
Yangzi Tiger Leaping Gorge in Yunnan, China, Asia
The deep gorge of the Colorado River on the west rim of the Grand Canyon, UNESCO World Heritage Site, Arizona, United States of America, North America
Spitzkoppe, 1728m, between Windhoek and Shakapmund, Damaraland, Namibia, Africa
Aerial view of Victoria Falls, Zimbabwe, Africa
Rock formations of The Burren, County Clare, Munster, Republic of Ireland, Europe
Ochre quarries at Roussillon, Provence, France, Europe
The Morning Glory Pool, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Giants Causeway, UNESCO World Heritage Site, County Antrim, Ulster, Northern Ireland, United Kingdom, Europe
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
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
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
Tools for polishing gemstones in Borneo, Southeast Asia, Asia
Wind eroded pinnacle rock showing strata, Tamegaout, Algeria, North Africa, Africa
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
Briksdal's Glacier flowing into Nordfjord, Norway, Scandinavia, Europe
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
Yellow school bus, for students on geology field trip, Waterton Glacier International Peace Park, Rocky Mountains, Montana, United States of America, North America
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
Kaietur Falls, Guyana, South 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
Dona Ana beach, Lagos, Western Algarve, Algarve, Portugal, Europe
Karakoram mountain range and the massif of the Hindu Kush, in northern area, Pakistan, Asia
Garibaldi Glacier, Darwin National Park, Tierra del Fuego, Patagonia, Chile, South America
Salt Lake, Chott el Jerid, Tunisia, North Africa, Africa
The Grand Canyon at sunset from the South Rim, UNESCO World Heritage Site, Arizona, United States of America, North America
The Chocolate Hills of Bohol, famous geological curiosity, of which there are over 1000, Bohol, Philippines, Southeast Asia, Asia
The Chocolate Hills of Bohol, famous geological curiosity, of which there are over 1000, Bohol, Philippines, Southeast Asia, Asia
Thermal activity, Karapiti area, Taupo, South Auckland, North Island, New Zealand, Pacific
Glacial sediment causes blue colour in Lake Tekapo, mountains of the Southern Alps behind, Canterbury, South Island, New Zealand, Pacific
Perfect example of strato-volcano, island cone left by subsidence, Crater Lake, Oregon, United States of America (U.S.A.), North America