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After harvesting quinoa, farmers have to thresh the seedheads and winnow the seeds to remove the husk, South-Western Bolivia, South America

Tourists walking through lava field around the very active Erta Ale shield volcano, Danakil depression, Ethiopia, Africa

Haleakala Crater, in Haleakala National Park, Maui's dormant volcano, Hawaii, United States of America, Pacific, North America

Aerial view from hot air balloon over magnificent desert landscape of sand dunes, mountains and Fairy Circles, Namib Rand game reserve Namib Naukluft Park, Namibia, Africa

Yellow blossom of Mimosa tree (Acacia dealbata), Cabo de Gata natural park, Almeria, Andalusia, Spain, Europe

Frost covered granite rocks on the moorland at Hayne Down in Dartmoor National Park, Devon, England, United Kingdom, Europe

Dead trees and orange sand dunes, Dead Vlei, Sossusvlei dune field, Namib-Naukluft Park, Namib Desert, Namibia, Africa

Sedimentary layers of bluish bentonite clay, Blue Mesa Trail, Blue Mesa, Petrified Forest National Park, Arizona, United States of America, North America

Yellow broomrape (Cistanche phelypaea), flowering in Paraje Natural de Karst en Yesos, Almeria, Andalusia, Spain, Europe

Aerial view from hot air balloon over magnificent desert landscape covered in Fairy Circles, Namib Rand game reserve Namib Naukluft Park, Namibia, Africa

Coyote Buttes North, fragil sandstone formed by wind and water, Paria Wilderness Area, Arizona, United States of America, North America

Aerial view of mountains, glaciers and ice fields on the west coast of Spitsbergen on a commercial flight from Longyearbyen to Oslo, Svalbard, Norway, Scandinavia, Europe

Panoramic view of mountains and dune glowing in last light before sunset, Namib Rand, Namib Naukluft Park, Namibia, Africa

El Tatio geyser basin on altiplano, boiling pool with algal colour zoning, Atacama Desert, Chile, South America

Aerial view from hot air balloon at dawn over magnificent desert landscape of sand dunes, mountains and Fairy Circles, Namib Rand game reserve Namib Naukluft Park, Namibia, Africa

Aerial view from hot air balloon at dawn over magnificent desert landscape of sand dunes, mountains and Fairy Circles, Namib Rand game reserve Namib Naukluft Park, Namibia, Africa

Backpacker walking across dried up lake towards Llaima volcano, Conguillio National Park, Chile, South America

Old truck on a huge pole in the Mungo National Park, part of the Willandra Lakes Region, UNESCO World Heritage Site, Victoria, Australia, Pacific

Aerial view from hot air balloon over magnificent desert landscape of sand dunes, mountains and Fairy Circles, Namib Rand game reserve Namib Naukluft Park, Namibia, Africa

Badlands with clouds, Theodore Roosevelt National Park, North Dakota, United States of America, North America

Penstemon flowers, Mount St. Helens, Mount St. Helens National Volcanic Monument, Washington state, United States of America, North America

Panoramic view over orange sand dunes towards the mountains, Namib Rand private game reserve, Namibia, Africa

Three Sisters, Goblin Valley State Park, near Hanksville, Utah, United States of America, North America

Fumaroles on collapsed side of Papandayan Volcano, an active four crater caldera, Garut, West Java, Java, Indonesia, Southeast Asia, Asia

View of a section of the Great Wall, UNESCO World Heritage Site, between Jinshanling and Simatai near Beijing, China, Asia

Panoramic view of the Ancient orange sand dunes of the Namib Desert at Sossusvlei, near Sesriem, Namib Naukluft Park, Namibia, Africa

Sedimentary layers of bluish bentonite clay, The Tepees, Petrified Forest National Park, Arizona, United States of America, North America

Land rover game vehicle parked by sand road at sunrise, Namib Rand game reserve, Namib Naukluft Park, Namibia, Africa

Bactrian camel train along base of huge sand dunes, blue skies on a summer evening, Khongoryn Els, Gobi Desert, Mongolia, Central Asia, Asia

Meyil Obruk, 640m wide sinkhole lake, Esentepe, Obruk Plateau, Karapinar, Konya Basin, Anatolia, Turkey, Asia Minor, Eurasia

Pueblo Bonito from 1000-1100 AD, Anasazi site, Chaco Canyon National Monument, New Mexico, United States of America (U.S.A.), North America

Dam and reservoir partially silted up by sediment, Presa de la Penitas, Fuerteventura, Canary Islands, Spain, Atlantic, Europe

Sunrise, Flaming Cliffs, area of dinosaur bone and egg fossils, Gurvan Saikhan National Park, Bayanzag, Gobi Desert, Mongolia, Central Asia, Asia

Looking towards the dunes of Sossusvlei, with two tiny figures on the lower ridge of the dune, Namib Naukluft, Namibia, Africa

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

Sedimentary layers of bluish bentonite clay with petrified wood, Blue Mesa Trail, Blue Mesa, Petrified Forest National Park, Arizona, United States of America, North America

Laura Grier at sunrise at The Badlands, Black Hills, South Dakota, United States of America, North America

Dead camel thorn tree against the orange sand of Elim Dune, Namib Desert near Sesriem, Namib Naukluft Park, Namibia, Africa

Aerial view from hot air balloon over magnificent desert landscape of sand dunes, mountains and Fairy Circles, Namib Rand game reserve Namib Naukluft Park, Namibia, Africa

Sandstone mountains lit by the last rays of light from the setting sun, near Sesriem, Namib Desert, Namib Naukluft Park, Namibia, Africa

Desert road stretching into the distance with rocky mountains under a clear blue sky in Tenerife, Canary Islands, Spain, Atlantic, Europe

Bare tree among boulders at sunrise, Joshua Tree National Park, California, United States of America, North America

Details of the salt deposits in the Salar de Uyuni salt flat and the Andes mountains in the distance in south-western Bolivia, Bolivia, South America

Sunrise in the badlands, Theodore Roosevelt National Park, North Dakota, United States of America, North America

Panoramic view of volcanic landscape near the village of Cavusin, near Goreme, Cappadocia, Anataolia, Turkey, Asia Minor, Asia

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

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

Hikers out on the Atacama Salt Flats, with snow-capped volcanic peaks in the background, near San Pedro de Atacama, Chile, South America

Panoramic view of sunset over mountains in the Namib Rand private reserve, Namib Desert, Namibia, Africa

Indus River at Skardu looking downstream, Mount Marshakala, 5150m, Mashabrum Range, Karakorams, Baltistan, Pakistan, Asia

West Rim at sunrise, Grand Canyon, UNESCO World Heritage Site, Arizona, United States of America (U.S.A.), North America

View over village houses and plastic farming in the valley from Nijar, Almeria, Andalusia, Spain, Europe

Walls of China, a series of Lunettes in the Mungo National Park, part of the Willandra Lakes Region, UNESCO World Heritage Site, Victoria, Australia, Pacific

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