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Skylight, view through cooled lava to molten lava below, Kilauea Volcano, Hawaii Volcanoes National Park, Island of Hawaii (Big Island', Hawaii, United States of America, North America
Remarkable Rocks, Flinders Chase National Park, Kangaroo Island, South Australia, Australia, Pacific
Salt and algal deposits at Lake Clifton, one of a string of coastal lakes south of Mandurah, Yalgorup National Park, Mandurah, Western Australia, Australia, Pacific
Yaga River and karst limestone cliffs of Escuain gorge, Ordesa and Monte Perdido National Park, Huesca, Aragon, Spain, Europe
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
Dormant volcano, Mount Ngauruhoe, Tongariro National Park, UNESCO World Heritage Site, Taupo, South Auckland, North Island, New Zealand, Pacific
Norber erratics near Austwick, erratic boulders left on limestone pavement by erosion, Yorkshire Dales National Park, Yorkshire, England, United Kingdom, Europe
The Olgas, Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific
The Domes, Bungle Bungle, Purnululu National Park, UNESCO World Heritage Site, Kimberley, Western Australia, Australia, Pacific
Dry river and beehive-like mounds in the Purnululu National Park, UNESCO World Heritage Site, Bungle Bungle mountain range, Western Australia, Australia, Pacific
Poas Volcano, Poas Volcano National Park, Costa Rica, Central America
Uluru (Ayers Rock), Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific
Fossil logs 200 million years old scattered over desert floor in National Park, Petrified Forest National Park, Arizona, United States of America (U.S.A.), North America
The Screes, Lake Wastwater, Wasdale, Lake District National Park, Cumbria, England, United Kingdom, Europe
Uluru (Ayers Rock), Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific
Poas Volcano, Poas Volcano National Park, Costa Rica, Central America
Karst limestone peaks within Ordesa and Monte Perdido National Park, Spanish Pyrenees, Huesca, Aragon, Spain, Europe
Uluru (Ayers Rock), Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific
Castle and Sawmill Geysers in eruption in Old Faithful Geyser Basin in winter, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America (U.S.A.), North America
Garibaldi Glacier, Darwin National Park, Tierra del Fuego, Patagonia, Chile, South America
Red sand dunes, up to 300m, Sossusvlei, Namib-Naukluft Desert Park, Namibia, Africa
The Olgas, Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific
Salt pan polygons at Badwater Basin, 282ft below sea level and the lowest place in North America, 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
Tourists viewing the Morning Glory Pool, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Hoodoos, Bryce amphitheater, Bryce Canyon National Park, Utah, United States of America (U.S.A.), North America
Norber erratics near Austwick, erratic boulders left on limestone pavement by erosion, Yorkshire Dales National Park, Yorkshire, England, United Kingdom, Europe
Hikers walking through a lava field on the Tongariro Crossing, Tongariro National Park, the oldest national park in the country, UNESCO World Heritage Site, Taupo Volcanic Zone, North Island, New Zealand, Pacific
Hikers at Red Crater on the Tongariro Crossing, Tongariro National Park, the oldest national park in the country, UNESCO World Heritage Site, Taupo Volcanic Zone, North Island, New Zealand, Pacific
Oxara River tumbles down the Almannagja cliff face at Oxarafoss, Thingvellir National Park, UNESCO World Heritage Site, south-west Iceland (Sudurland), Iceland, Polar Regions
Close-up of dinosaur footprint, Dinosaur Trackway, Clayton Lake State Park, Clayton, New Mexico, 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
Rocky amphitheatre with pool, at head of Cathedral Gorge, Purnululu National Park, UNESCO World Heritage site, Bungle Bungle, Kimberley, Western Australia, Australia, Pacific
Blisters measuring about 10 cm across in boiling mud pool, Mud volcano, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America (U.S.A.), North America
Bromo-Tengger-Semeru National Park at dawn, island of Java, Indonesia, Southeast Asia, Asia
Geysers in Yellowstone National Park, UNESCO World Heritage Site, Montana, 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
Uluru (Ayers Rock), Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific
The Olgas, Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific
Anisclo Canyon and eroded karst limestone Mondoto peak, Ordesa and Monte Perdido National Park, Huesca, Aragon, Spain, Europe
Balanced Rock, a pinnacle of red sandstone caused by erosion, in the Arches National Park in Utah, United States of America, North America
Rock formations caused by erosion and known as North Window Arch, Arches National Park, Utah, United States of America, North America
Dinosaur Tracks, Clayton Lake State Park, New Mexico, United States of America, North America
Rio Grande River, Santa Elena Canyon, Big Bend National Park, Texas, United States of America, North America
Monument Valley Navajo Tribal Park, Utah Arizona border, United States of America, North America
Monument Valley Navajo Tribal Park, Utah Arizona border area, United States of America, North America
Thor's Hammer near Sunset Point, Bryce Canyon National Park, Utah, United States of America, North America
Delicate Arch, Arches National Park, Moab, Utah, United States of America, North America
Dinosaur Trackway, Clayton Lake State Park, Clayton, New Mexico, United States of America, North America
Aerial view of peak of Mount Cook, Mount Cook National Park, Southern Alps, Canterbury, South Island, New Zealand, Pacific
Rim of Gunung Bromo, Bromo-Tengger-Semeru National Park, island of Java, Indonesia, Southeast Asia, Asia
Palo Duro State Park, near Amarillo, 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
Salt pan polygons at Badwater Basin, 282ft below sea level and the lowest place in North America, 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
Pancake Rocks, Punakaiki, Paparoa National Park, Westland, South Island, New Zealand, Pacific
Uluru (Ayers Rock), Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific
Sand dunes in the Great Sand Dunes National Park and Preserve with Sangre Cristo Mountains in the background, Colorado, United States of America, North America
Skaftafellsjokull, impressive glacial tongue of the Vatnajokull ice cap in Skaftafell National Park, south-east Iceland (Austurland), Iceland, Polar Regions
Glacier near Plaza de Mulas basecamp, Aconcagua Provincial Park, Andes mountains, Argentina, South America
Glacier near Plaza de Mulas basecamp, Aconcagua Provincial Park, Andes mountains, Argentina, South America
Flinders Ranges National Park, South Australia, Australia, Pacific
Sandstone layers under clouds, Valley of Fire State Park, Nevada, United States of America, North 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
Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America
Echinus Geyser, erupts every hour in Norris Basin, 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
Beauchamp Falls, Blue Mountains National Park, UNESCO World Heritage Site, near Blackheath, New South Wales (N.S.W.), Australia, Pacific
Moraine Lake with mountains that overlook Valley of the Ten Peaks, Banff National Park, Canada, North America
Hot water in pools on calcite terraces deposited by Mammoth Hot Springs, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America (U.S.A.), North America
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
Gokyo Lakes, Gokyo, Sagarmatha National Park, UNESCO World Heritage Site), Solukhumbu District, Sagarmatha, Eastern Region, Nepal, Asia
Kilauea thermal area, Hawaii Volcanoes National Park, UNESCO World Heritage Site, Island of Hawaii (Big Island), Hawaii, United States of America, North America
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
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
Garibaldi Glacier, Darwin National Park, Tierra del Fuego, Patagonia, Chile, South America
Whakarewarewa Thermal Park, Rotorua, North Island, New Zealand, Pacific
Death Vlei, Namib Naukluft Park, Namibia, Africa
Double Arch in the Windows section of Arches National Park, Utah, United States of America, North America
Thor's Hammer, Bryce Canyon National Park, Utah, United States of America, North America
Unique rock formation in the Organ Pipes National Park, Victoria, Australia, Pacific
Aerial view, Canyonlands National Park, Utah, United States of America, North 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
Dinosaur Trackway, Clayton Lake State Park, Clayton, New Mexico, United States of America, North America
Djupalonssandur beach, Snaefellsness National Park, Iceland, Polar Regions
Svartifoss waterfall with basalt columns in Skaftafell National Park, South area, Iceland, Polar Regions
Mount Teide (Pico de Teide), Teide National Park, Tenerife, Canary Islands, Spain, Atlantic, Europe
Norber erratics near Austwick, erratic boulders left on limestone pavement by erosion, Yorkshire Dales National Park, Yorkshire, England, United Kingdom, Europe
Pine tree on a slickrock face, Zion National Park, Utah, United States of America, North America
Aerial photo, Skeleton Coast Park, Namibia, Africa
The Olgas, Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific
Uluru (Ayers Rock), Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific
Morning Glory spring, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Hancock Gorge, Karijini National Park, Pilbara, Western Australia, Australia, Pacific
Sunrise, West Temple, Zion National Park, Utah, United States of America, North America
Turret Arch through North Window at dawn, Arches National Park, Utah, United States of America, North America
Islands in the Sky, Canyonlands National Park, Utah, United States of America, North America