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Sitting Hen Butte and Rooster Butte at sunset, Valley of the Gods, Utah, United States of America, North America

Landscape at Teide National Park, UNESCO World Heritage Site, Tenerife, Canary Islands, Spain, Atlantic, Europe

Limestone stalactites and stalagmites in Ballic Cave, near Tokat, Central Anatolia, Turkey, Asia Minor, Eurasia

Septarian nodules washed out from cliff of Palaeocene clays, Moeraki Boulders, Dunedin, South Island, New Zealand, Pacific

Desert View Watchtower, Grand Canyon National Park, UNESCO World Heritage Site, Northern Arizona, United States of America, North America

Toadstool hoodoo, Grand Staircase-Escalante National Monument, Utah, United States of America, North America

Shida Kartli, monastery at Bronze Age settlement of Uplistsikhe, ancient cave city, near Gori, Georgia, Caucasus, Central Asia, Asia

Barnacle encrusted rocks with Black Nab, Saltwick Nab and the wreck of Admiral von Tromp, Saltwick Bay, North Yorkshire, Yorkshire, England, United Kingdom, Europe

View from Mount Chacaltaya, altiplano in distance, Calahuyo near La Paz, Bolivia, Andes, South America

The Mini Wave formation, Coyote Buttes Wilderness, Vermillion Cliffs National Monument, Arizona, United States of America, North America

Snow covered rocky moorland at sunrise in winter, Great Staple Tor, Dartmoor National Park, Devon, England, United Kingdom, Europe

El Capitan rising above Yosemite Valley from Tunnel View, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

Sunrise from atop a sandstone hill, Grand Staircase-Escalante National Monument, Utah, United States of America, North America

Emerald Spring in Norris Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Disused salt pans at Pedra De Lume, Pedra di Lumi, the centre of salt production and trade, Sal Island, Cape Verde, Atlantic, Africa

Strokkur Geysir erupting at sunrise during winter, geothermal area beside the Hvita River, Geysir, Iceland, Polar Regions

Ingleborough seen from the limestone pavement on Twistleton Scar, Yorkshire Dales National Park, North Yorkshire, England, United Kingdom, Europe

Rock formations caused by erosion, with Turret Arch seen through North Window, in the Arches National Park, Utah, USA

Sandstone hills in The Domes area of Purnululu National Park (Bungle Bungle), UNESCO World Heritage Site, Western Australia, Australia, Pacific

Little boats lying in the grass in front of Mount Lidgbird and Mount Gower in the background, Lord Howe Island, UNESCO World Heritage Site, Australia, Tasman Sea, Pacific

Bare moon-like arid landscape in mountains between Pajara and La Pared, Fuerteventura, Canary Islands, Spain, Atlantic, Europe

Cactus and sandstone formations at dawn, Valley Of Fire State Park, Nevada, United States of America, North America

Valley of the Moon (Valle de la Luna), Ischigualasto Provincial Park, San Juan Province, North Argentina, South America

Crater at the top of Sibayak Volcano, an active volcano at Berastagi (Brastagi), North Sumatra, Indonesia, Southeast Asia, Asia

Symphony of Stones basalt columns, UNESCO World Heritage Site, Garni, Kotayk Province, Armenia, Caucasus, Central Asia, Asia

Bladder wrack (Fucus vesiculosus) and sandstone patterns, Northumberland, England, United Kingdom, Europe

Window Rock Navajo Tribal Park & Veteran's Memorial, Window Rock, Arizona, United States of America, North America

Eyjafjallajokull eruption showing billowing ash plume and rocks exploding into the sky of southern Iceland, Iceland, Polar Regions

Distant view towards mountains with the ash plume of the Eyjafjallajokull eruption in the distance, near Hella, southern area, Iceland, Polar Regions

Window Rock Navajo Tribal Park & Veteran's Memorial, Window Rock, Arizona, United States of America, North America

Canyon de Chelly National Monument, View from the Whitehouse Overlook, Arizona, United States of America

Canyon de Chelly National Monument, View from the Whitehouse Overlook, Arizona, United States of America

Divers preparing for dive in the grotto collapsed cave on Saipan, Northern Marianas, Central Pacific, Pacific

Pinwheel Geyser, Porcelain Basin, Norris Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Mesa Arch, Island in the Sky, Canyonlands National Park, Utah, United States of America, North America

Mount Fitz Roy (Cerro Chalten), a typical Patagonia landscape, Los Glaciares National Park, UNESCO World Heritage Site, El Chalten, Argentina, South America

Granite boulders in the Devil's Marbles Conservation Reserve, Northern Territory, Australia, Pacific

Shida Kartli, monastery at Bronze Age settlement of Uplistsikhe, ancient cave city, near Gori, Georgia, Caucasus, Central Asia, Asia

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

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

Sunset on a showery evening at Saltwick Bay, North Yorkshire, Yorkshire, England, United Kingdom, Europe

Caldeira and Bromo at 2329 m, and Semeru at 3676m, volcanoes on Java, Indonesia, Southeast Asia, Asia

Snow covered moorland at Great Staple Tor in winter, Dartmoor National Park, Devon, England, United Kingdom, Europe

Waves of Brain Rock, White Pocket, Vermilion Cliffs National Monument, Arizona, United States of America, North America

Yellowstone River near Calcite Springs, Yellowstone National Park, UNESCO Wortld Heritage Site, Wyoming, United States of America, North America

Lago Quilotoa, caldera lake in extinct volcano in central highlands of Andes, Ecuador, South America

Lights and shadows in Upper Antelope Canyon, Navajo Tribal Park, Arizona, United States of America, North America

A man stands in sagebrush, looking at a large rock formation during sunrise in the desert, Oregon, United States of America, North America

Sandstone formations at dawn, Valley of Fire State Park, Nevada, United States of America, North America