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Warm light envelops the majestic rock formation in Bryce Canyon National Park on a summer day, Utah, United States of America

Boulder pile in a valley leading to Dead Wash, Petrified Forest National Park, Arizona, United States of America

Remarkable sandstone rock carved by erosion in the Ashar Valley, AlUla, Medina Province, Saudi Arabia

A small hill of gray bentonite clay that appears to be melting into the purple bentonite of Hamilili Valley on the south end of Petrified Forest National Park, Arizona, United States of America, North America

Panorama of Kok-Moinok Canyon, a clay-sand structure formed on the slopes of arid mountains cut by water streams, Kyrgyzstan, Central Asia, Asia

Kok-Moinok Canyon, a clay-sand structure formed on the slopes of arid mountains cut by water streams, Kyrgyzstan, Central Asia, Asia

Kok-Moinok Canyon, a clay-sand structure formed on the slopes of arid mountains cut by water streams, Kyrgyzstan, Central Asia, Asia

Aerial view of Kok-Moinok Canyon, a clay-sand structure formed on the slopes of arid mountains cut by water streams, Kyrgyzstan, Central Asia, Asia

Rock formations of Red Valley (Rose Valley), Cavusin, Cappadocia, Anatolia, Turkey, Asia Minor, Asia

Tall hoodoo towers in the valley below Blue Mesa in Petrified Forest National Park, Arizona, United States of America, North America

Scenic view of hoodoos and rock formations, Sunrise Point, Bryce Canyon National Park, Utah, United States of America, North America

Grand Canyon at sunset, Yavapai Point, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Details of the sand dunes at Mesquite Flat, Death Valley, California, United States of America, North America

Boulder pile in a valley leading to Dead Wash in Petrified Forest National Park, Arizona, United States of America

Remarkable sandstone rock carved by erosion in the Ashar Valley, AlUla, Medina Province, Saudi Arabia

Remarkable sandstone rock carved by erosion in the Ashar Valley, AlUla, Medina Province, Saudi Arabia

View of Buttes from Artists Point, Monument Valley Navajo Tribal Park, Utah, United States of America

Islands of Rock in Hamilili Valley on the south end of Petrified Forest National Park, Arizona, United States of America, North America

A lone hoodoo rock on the edge of a ridge overlooking the Jim Camp Wash on the south end of Petrified Forest National Park, Arizona, United States of America, North America

A ridge of gray bentonite viewed from a nearby flat top mesa on the south end of Petrified Forest National Park, Arizona, United States of America, North America

A narrow slot canyon of bentonite on the south end of Petrified Forest National Park, Arizona, United States of America, North America

The North Valley below the Blue Mesa in Petrified Forest National Park, Arizona, United States of America, North America

Zabriskie Point, Death Valley National Monument, California, United States of America (USA), North America

Hiking trail along rugged arid mountain valley of the Sierra Nevada, with Alcazaba in the distance, Andalusia, Spain, Europe

Plateau and canyon country rising 2000 feet above the Grand Valley of the Colorado River, part of the Great Colorado Plateau, Colorado National Monument, Colorado, United States of America, North America

Detail of sandstone with circular rings, Valley of Fire State Park, Nevada, United States of America, North America

Red and white sandstone stripes at sunrise, Valley of Fire State Park, Nevada, United States of America, North America

Plateau and canyon country rising 2000 feet above the Grand Valley of the Colorado River, part of the Great Colorado Plateau, Colorado National Monument, Colorado, United States of America, North America

Phallic pillars known as fairy chimneys in the valley known as Love Valley near Goreme in Cappadocia, Anatolia, Turkey, Asia Minor, Eurasia

Totem Pole and Yei Bi Chei rock formations and sand dunes, Monument Valley, Arizona, United States of America, North America

Hoodoo spires rising above the valley below the south side of Blue Mesa in Petrified Forest National Park, Arizona, United States of America, North America

Manly Beacon and the Siltstone eroded foothills formations at Zabriske Poin at sunrise, Furnace creek, Death Valley National Park, California, United States of America, North America

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

Temple of Heracles, Valley of the Temples (Valle dei Templi), UNESCO World Heritage Site, Agrigento, Sicily, Italy, Europe

Eroded rock pinnacles, Valle de la Luna (Valley of the Moon), Atacama Desert, Norte Grande, Chile, South America

The Grand Canyon in winter, UNESCO World Heritage Site, Arizona, United States of America (U.S.A.), North America

Manly Beacon and the Siltstone eroded foothills formations at Zabriske Point at sunrise, Furnace creek, Death Valley National Park, California, United States of America, North America

A pointed peak of bentonite in Hamilili Valley on the south end of Petrified Forest National Park, Arizona, United States of America, North America

Rock formations known as The Mittens on the Navajo Tribal Reservation in Monument Valley, on the Utah Arizona border, USA

Sandstone arch under clouds, Valley of Fire State Park, Nevada, United States of America, North America

Rock formations resulting from differential erosion, Goreme Valley, Cappadocia, Anatolia, Turkey, Asia Minor, Asia

Patterns in yellow, orange, and purple sandstone, Valley of Fire State Park, Nevada, United States of America, North America

Temple of Heracles, Valley of the Temples (Valle dei Templi), UNESCO World Heritage Site, Agrigento, Sicily, Italy, Europe

Sandstone formations, White Pockets, Paria Plateau, Northern Arizona, United States of America, North America

The Three Judges at sunrise, Goblin Valley State Park, Utah, United States of America, North America

View southeast from top of Sella Group to Passo Pordoi road in valley, Dolomites, Trentino-Alto Adige, Italy, Europe

Left and Right Mittens, Monument Valley Navajo Tribal Park, Arizona, United States of America, North America

Soca River with clear emerald water flowing between eroded rocks in Trenta Valley in summer, Triglav National Park, Julian Alps, Slovenia, Europe

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

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

Early morning light on corrugated badlands landscape at Zabriskie Point, Death Valley National Park, California, United States of America, North America

Rock strata in cliffs in Paria River Valley, Grand Staircase-Escalante National Monument, near Page, Arizona, United States of America, North America

Ignimbrite exposed in river canyons cut since 1912 eruption, in the Valley of Ten Thousand Smokes, in Katmai Volcano National Park, Alaska, United States of America, North America

Tourists at Valle de la Luna (Valley of the Moon), La Paz, La Paz Department, Bolivia, South America

Artist's Palette, Artist's Drive, Death Valley National Park, California, United States of America, North America

Rock formations caused by erosion in a desert landscape in Monument Valley, Arizona, United States of America, North America

Tourists cross flood scoured rocks, past typical formations, Purnululu National Park, UNESCO World Heritage Site, Bungle Bungle, Kimberley, Western Australia, Australia, Pacific

Phallic pillars known as fairy chimneys in the valley known as Love Valley near Goreme in Cappadocia, Anatolia, Turkey, Asia Minor, Eurasia