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Gokyo Lakes, Gokyo, Sagarmatha National Park, UNESCO World Heritage Site), Solukhumbu District, Sagarmatha, Eastern Region, Nepal, Asia

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

Close-up of dinosaur footprint, Dinosaur Trackway, Clayton Lake State Park, Clayton, New Mexico, United States of America, North America

Svartifoss waterfall with basalt columns in Skaftafell National Park, South area, Iceland, Polar Regions

Rock formations caused by erosion and known as North Window Arch, Arches National Park, Utah, United States of America, North America

Beauchamp Falls, Blue Mountains National Park, UNESCO World Heritage Site, near Blackheath, New South Wales (N.S.W.), Australia, Pacific

Rim of Gunung Bromo, Bromo-Tengger-Semeru National Park, island of Java, Indonesia, Southeast Asia, Asia

Turret Arch through North Window at sunrise, Arches National Park, Moab, Utah, United States of America, North America

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

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

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

Dinosaur Trackway, Clayton Lake State Park, Clayton, New Mexico, United States of America, North America

Geysers in Yellowstone National Park, UNESCO World Heritage Site, Montana, United States of America, North America

Rio Grande River, Santa Elena Canyon, Big Bend National Park, Texas, United States of America, North America

Echidna Chasm Walk, Purnululu National Park, UNESCO World Heritage Site, Bungle Bungle mountain range, Western Australia, Australia, Pacific

Glacier near Plaza de Mulas basecamp, Aconcagua Provincial Park, Andes mountains, Argentina, South America

West Temple, 7810 feet on left, and Sundial Tower, 7590 feet center rear, Zion National Park, Utah, United States of America, North America

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

Outcrop of Manhattan gneiss which forms bedrock for skyscrapers, Central Park, New York City, New York, United States of America (U.S.A.), North America

Travertine calcite deposits, Minerva Terrace, Mammoth Hot Springs and Terraces, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America (U.S.A.), North America

Tourists on viewing platform, Punakaiki, Pancake Rocks and blowholes, Paparoa National Park, Westland, South Island, New Zealand, Pacific

Dinosaur Trackway, Clayton Lake State Park, Clayton, New Mexico, United States of America, North America

Rock formation caused by erosion and known as Delicate Arch in the Arches National Park in Utah, United States of America, North America

Kilauea thermal area, Hawaii Volcanoes National Park, UNESCO World Heritage Site, Island of Hawaii (Big Island), Hawaii, United States of America, North America

Morning Glory spring, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Turret Arch through North Window at dawn, Arches National Park, Utah, United States of America, North America

Glacier near Plaza de Mulas basecamp, Aconcagua Provincial Park, Andes mountains, Argentina, South America

Close-up of the limestone terraces formed by volcanic water depositing six inches of calcium carbonate a year, Mammoth Hot Springs and Terraces, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Double Arch in the Windows section of Arches National Park, Utah, United States of America, North America

The Olgas, Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific

Skaftafellsjokull, impressive glacial tongue of the Vatnajokull ice cap in Skaftafell National Park, south-east Iceland (Austurland), Iceland, Polar Regions

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

Travertine calcite deposits on the Canary Spring terraces, Mammoth Hot Springs and Terraces, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Norber erratics near Austwick, erratic boulders left on limestone pavement by erosion, Yorkshire Dales National Park, Yorkshire, England, United Kingdom, Europe

Red sandstone rocks, with Muddy Mountains in the background, in the Valley of Fire State Park, Nevada, United States of America, North America

View from the Rim, Grand Canyon of the Yellowstone River, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America (U.S.A.), North America

Rock patterns, Stanage Edge, Peak District National Park, Derbyshire, England, United Kingdom, Europe

Blue Mesa, Petrified Forest National Park, Arizona, United States of America (U.S.A.), North America

Late afternoon, Yovimpa Point, Bryce Canyon National Park, Utah, United States of America, North America

Geyser, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

View from Sunrise Point at sunrise, Bryce Canyon National Park, Utah, United States of America, North America

Multi coloured sandstone rock formations in the Valley of Fire State Park, Nevada, United States of America, North America

Midway Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America (U.S.A.), North America

Water tumbling upon black basalt columns at famous Svartifoss waterfall in Skaftafell National Park, south-east Iceland (Austurland), Iceland, Polar Regions

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

Coloured bands and ridges on the Blue Mesa in the Petrified Forest National Park in Arizona, United States of America, North America

Monument Valley Navajo Tribal Park, Utah Arizona border area, United States of America, North America

Pine tree and bushes growing on slickrock, Zion National Park, Utah, United States of America, North America

Path between crater cones inside Haleakala volcano crater, Haleakala National Park, island of Maui, Hawaii, United States of America, Pacific

Geysers in Yellowstone National Park, UNESCO World Heritage Site, Montana, United States of America, North America

View over the pinnacles in the beautiful rock formations of Bryce Canyon National Park, Utah, United States of America, North America

View over the pinnacles in the beautiful rock formations of Bryce Canyon National Park, Utah, United States of America, North America

Dormant 10,457ft Lassen Peak, the world's largest plug-dome volcano, in Lassen Volcanic National Park, an area of volcanic activity and features, Lassen Volcanic Park, Northern California, California, United States of America (USA), North America

The eroded sandstone landscape of Monument Valley Tribal Park, a Navajo Nation reservation on the border with Utah, its scenery immortalised in many Western films, Monument Valley, Arizona, United States of America (USA), North America

Looking from Dead Horse Point near Canyonlands National Park over the Colorado River canyon to the evaporation ponds at Potash. Mined salts are concentrated here for the extraction of potash for fertilizer, Dead Horse Point State Park, Utah, USA

'Bacon strip' curtain formations at King Solomon's Cave in the Mole Creek Karst National Park, the north, Tasmania, Australia, Pacific

Sea stacks and dramatic limestone cliffs at The Twelve Apostles, Port Campbell National Park, Great Ocean Road, Victoria, Australia, Pacific

Sea stacks and dramatic limestone cliffs at The Twelve Apostles, Port Campbell National Park, Great Ocean Road, Victoria, Australia, Pacific

Ladder leading down into a channel between the limestone karsts of the Grand Tsingy in Tsingy de Bemaraha National Park, UNESCO World Heritage Site, western Madagascar, Madagascar, Africa

View across the Grand Tsingy landscape of limestone karst in the Tsingy de Bemaraha National Park, UNESCO World Heritage Site, western Madagascar, Madagascar, Africa

View across the Grand Tsingy landscape of limestone karst in the Tsingy de Bemaraha National Park, UNESCO World Heritage Site, western Madagascar, Madagascar, Africa

A pool above the Nevada Fall in the Little Yosemite Valley, Yosemite National Park, California, USA.