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Mono Lake tufa towers at sunset in autumn, California, United States of America, North America
The beehive-like mounds, Purnululu National Park, UNESCO World Heritage Site, Bungle Bungle Mountain Range, Western Australia, Australia, Pacific
Fosso Sinkhole, summit of Mount Roraima (Cerro Roraima), Tepuis, Venezuela, South America
Jenny Twigg and her daughter Tib, gritstone formations on heather covered moors, Upper Nidderdale, North Yorkshire, Yorkshire, England, United Kingdom, Europe
Gritstone rock formations amongst the heather clad moors of Upper Nidderdale, North Yorkshire, Yorkshire, England, United Kingdom, Europe
Jenny Twigg and her daughter Tib, gritstone formations on heather covered moors, Upper Nidderdale, North Yorkshire, Yorkshire, England, United Kingdom, Europe
A colourful sunset over Durdle Door on the Jurassic Coast, UNESCO World Heritage Site, Dorset, England, United Kingdom, Europe
A colourful sunset over Durdle Door on the Jurassic Coast, UNESCO World Heritage Site, Dorset, England, United Kingdom, Europe
The Old Man of Storr, overlooking Loch Leathan and Raasay Sound, Trotternish, Isle of Skye, Inner Hebrides, Scotland, United Kingdom, Europe
The Old Man of Storr, a rock formation on the edge of the Trotternish Ridge, Isle of Skye, Inner Hebrides, Scotland, United Kingdom, Europe
Fosso Sinkhole, summit of Mount Roraima (Cerro Roraima), Tepuis, Venezuela, South America
Mount Etna Volcano, shrine where the lava from an eruption stopped, UNESCO World Heritage Site, Sicily, Italy, Europe
Mount Lidgbird and Mount Gower at sunset, Lord Howe Island, UNESCO World Heritage Site, Australia, Tasman Sea, Pacific
View of pier with Mount Lidgbird and Mount Gower in the background, Lord Howe Island, UNESCO World Heritage Site, Australia, Tasman Sea, Pacific
An active andesite stratovolcano on White Island, off the east side of North Island, New Zealand, Pacific
Boiling mud at an active andesite stratovolcano on White Island, off the east side of North Island, New Zealand, Pacific
Cliffs at Herald Island, UNESCO World Heritage Site, Chuckchi Sea, Russian Far East, Russia, Europe
Tham Khao Luang Cave, Phetchaburi, Thailand, Southeast Asia, Asia
Hoodoos, limestone features, Badlands, Drumheller area, Alberta, Canada, North America
Spectacular geological formations at Westcombe Beach in the South Hams, Devon, England, United Kingdom, Europe
Mount Olympus and Blue Glacier, Olympic National Park, UNESCO World Heritage Site, Washington State, United States of America, North America
Young woman enjoying the coast, Second Beach, Olympic National Park, UNESCO World Heritage Site, Washington State, United States of America, North America
A geological formation located near Twyfelfontein, Namibia, Africa
A geological formation of dolomite located near Twyfelfontein, Namibia, Africa
Dawn rainbow above Holwell Tor in summer, Dartmoor, Devon, England, United Kingdom, Europe
Ponies graze in the summer sunshine beside Chinkwell Tor in Dartmoor National Park, Devon, England, United Kingdom, Europe
Summer at Saddle Tor in Dartmoor National Park, Devon, England, United Kingdom, Europe
Glastonbury Tor on a misty summer morning, Somerset, England, United Kingdom, Europe
Dartmoor Ponies shelter beside a granite outcrop in summer near Saddle Tor, Dartmoor National Park, Devon, England, United Kingdom, Europe
Glastonbury Tor rising surrounded by mist at dawn in summer, Somerset, England, United Kingdom, Europe
Glastonbury Tor on a misty morning in summer, Somerset, England, United Kingdom, Europe
Rainbow over Dartmoor at dawn in summer, Holwell Tor, Dartmoor, Devon, England, United Kingdom, Europe
Summer morning on a rocky outcrop near Saddle Tor in Dartmoor National Park, Devon, England, United Kingdom, Europe
Leshan Grand Buddha (Giant Buddha), UNESCO World Heritage Site, Leshan, Lingyun Shan Mountain, Sichuan, China, Asia
Leshan Grand Buddha (Giant Buddha), UNESCO World Heritage Site, Leshan, Lingyun Shan Mountain, Sichuan, China, Asia
Layered sandstone column under clouds, Coyote Buttes Wilderness, Vermillion Cliffs National Monument, Arizona, United States of America, North America
Rock formations against a clear blue sky with mountains in the background, showcasing natural erosion and geological features in the Teide National Park,UNESCO World Heritage Site, Tenerife, Canary Islands, Spain, Atlantic, Europe
Evaporation of sea water in salt pans, Museo de la Sal (Salt Museum), Las Salinas del Carmen, Fuerteventura, Canary Islands, Spain, Atlantic, Europe
Kaleto Rock Fortress, rock formations, Belogradchik, Bulgaria, Europe
Peace Monument, Caucasus Mountains, Border of Russia and Georgia, Central Asia, Asia
Haleakala Crater, in Haleakala National Park, Maui's dormant volcano, Hawaii, United States of America, Pacific, North America
Interior, Shwe Oo Min natural Buddhist cave pagoda, Pindaya, Shan State, Myanmar (Burma), Asia
Petrified Forest National Park, Blue Mesa, Blue Mesa Trail, sedimentary layers of bluish bentonite clay
Petrified logs from the late Triassic period, 225 million years ago, Long Logs Trail, Petrified Forest National Park, Arizona, United States of America, North America
Agate Bridge, a petrified log spanning ravine, Petrified Forest National Park, Arizona, United States of America, North America
Raufarholsheillir lava tube cave system, Iceland, Polar Regions
Japanese warning sign on the crater rim of Mount Naka active volcano, Mount Aso, Kyushu, Japan, Asia
Hverfjall volcano crater at sunset, Myvatn, Iceland, Polar Regions
Alcantara gorge, Castiglione di Sicilia, Sicily, Italy, Mediterranean, Europe
Crateri Silvestri view, Etna, UNESCO World Heritage Site, Etna, Sicily, Italy, Mediterranean, Europe
Volcanic landscape, Valle del Bove, Etna, UNESCO World Heritage Site, Etna, Sicily, Italy, Mediterranean, Europe
Volcanic landscape, Valle del Bove, Etna, UNESCO World Heritage Site, Etna, Sicily, Italy, Mediterranean, Europe
Crateri Silvestri, high angle view, Etna, UNESCO World Heritage Site, Etna, Sicily, Italy, Mediterranean, Europe
Crateri Silvestri view, Etna, UNESCO World Heritage Site, Etna, Sicily, Italy, Mediterranean, Europe
Group of hikers walking up to Mount Etna summit, UNESCO World Heritage Site, Etna, Sicily, Italy, Mediterranean, Europe
Group of hikers walking up to Mount Etna summit, UNESCO World Heritage Site, Etna, Sicily, Italy, Mediterranean, Europe
Rock formations, Alcantara gorge, Castiglione di Sicilia, Sicily, Italy, Mediterranean, Europe
Lomaki Pueblo, inhabited from approximately 1100 AD to 1250 AD, Wupatki National Monument, Arizona, United States of America, North America
Mud pots, fumaroles and dormant Volcan Santa Clara at the San Jacinto volcanic thermal area north of Leon, Leon, Nicaragua, Central America
Puu Hinahina Lookout, Waimea Canyon State Park, Kauai, Hawaii, United States of America, Pacific
Aerial view of lagoon and karst limestone formations in Wayag Island, Raja Ampat, West Papua, Indonesia, Southeast Asia, Asia
Karst limestone formations and lagoon in Wayag Island with the photographer's kayak, Raja Ampat, West Papua, Indonesia, Southeast Asia, Asia
Karst limestone formations and lagoon in Wayag Island with the photographer's kayak, Raja Ampat, West Papua, Indonesia, Southeast Asia, Asia
Cenote Dzitnup, near Valladolid, Yucatan, Mexico, North America
Cenote Samula, near Valladolid, Yucatan, Mexico, North America
Colourful patterns created by sea erosion on rocks revealed at low tide on Spittal Beach, Berwick-upon-Tweed, Northumberland on border between England and Scotland, United Kingdom, Europe
Cenote Zaci, Valladolid, Yucatan, Mexico, North America
Cenote Ik Kil, near Chichen Itza, Yucatan, Mexico, North America
Karst limestone formations in Wayag Island, Raja Ampat, West Papua, Indonesia, Southeast Asia, Asia
Sea cliff and rock formations on Djupalonssandur beach, Iceland, Polar Regions
Grape vines growing in black volcanic pits in La Geria, Lanzarote, Canary Islands, Spain, Atlantic, Europe
Volcanic landscape with rocky terrain in the foreground and a clear blue sky over the ocean in the background in Tenerife, Canary Islands, Spain, Atlantic, Europe
Historic ancient salt pans on coast near Marsalforn, island of Gozo, Malta, Mediterranean, Europe
Woman posing in Rattlesnake Canyon, Arizona, United States of America, North America
Snow dusted Kes Tor showing Dartmoor's largest rock basin, Dartmoor National Park, Devon, England, United Kingdom, Europe
Ammonite fossils revealed in slate rock ledges at low tide, Kilve, Somerset, England, United Kingdom, Europe
Cotopaxi Volcano 5897m summit, Cotopaxi National Park, Cotopaxi Province, Ecuador, South America
Glaciar Frances, French Valley (Valle Frances), Torres del Paine National Park, Patagonia, Chile, South America
Blackchurch Rock and rocky ledges at twilight, Mouthmill Beach, North Devon, England, United Kingdom, Europe
Laguna Cejar (floating salt lake lagoon), Atacama Desert, North Chile, Chile, South America
Berlenga Grande Island, Portugal, Europe
The chalk cliffs of the Seven Sisters from the South Downs Way, South Downs National Park, East Sussex, England, United Kingdom, Europe
Glyn Rhonwy Disused Slate Quarry backed by the Llanberis Pass and Yr Wyddfa (Mount Snowdon) in autumn, near Llanberis, Snowdonia National Park (Eryri), North Wales, United Kingdom, Europe
The Nant Ffrancon valley in spring backed by Foel Goch and the Glyderau mountains, Snowdonia National Park (Eryri), North Wales, United Kingdom, Europe
Llyn Idwal and the Devils Kitchen in summer, Cwm Idwal, Snowdonia National Park (Eryri), North Wales, United Kingdom, Europe
Death Valley (Valle de la Muerte) and Licancabur Volcano, San Pedro de Atacama, Atacama Desert, North Chile, Chile, South America
Splashes of sulphur colouring Stefanos crater ground, Nisyros Island, Dodecanese Islands, Greek Islands, Greece, Europe
Barragem do Alqueva, Rio Guadiana river, Alqueva dam hydroelectric power, Moura, Portugal, Europe
Hot bubbling mud pool at Orakei Korako Thermal Park, The Hidden Valley, North Island, New Zealand, Pacific
Hot pool on the Rainbow Terrace at Orakei Korako Geyserland, The Hidden Valley, North Island, New Zealand, Pacific
Laguna Colorada, a shallow red salt lake in South West Bolivia, South America
The Sol de Manana geysers, a geothermal field at a height of 5000 metres, Bolivia, South America
Laguna Cejar (floating salt lake lagoon), Atacama Desert, North Chile, Chile, South America
Bands of light sand grains sorted from heavier dark minerals in intertidal zone at Playa Carrillo, Nicoya Peninsula, Costa Rica, Central America
Salt cones, Salar de Uyuni, Potosi, Bolivia, South America
Salt cones, Salar de Uyuni, Potosi, Bolivia, South America
Litlanesfoss, a hidden gem in the Eastern side of Iceland, Iceland, Polar Regions
A lone photographer stands perched on a rock silhouetted against the dawn orange sky at Yaki Point, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America
Al Ula, seen from Harrate viewpoint, North West Saudi Arabia, Middle East
Jebel al Fil (Elephant Rock), sandstone, Al Ula, North West Saudi Arabia, Middle East