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Christie's Hole, eroded volcanic rock coast of Papa Stour (Great Island of the Priests), Shetland Islands, Scotland, United Kingdom, Europe

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

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

Farmhouse beneath limestone scarp, Glwyseg mountain, Llangollen, Clwyd, Wales, United Kingdom, Europe

The Giants Causeway, UNESCO World Heritage Site, Co. Antrim, Ulster, Northern Ireland, United Kingdom, Europe

Castro de Gaviotas (Gull's fort) karst limestone rock archway, and La Canalina bay, near Llanes, Asturias, Spain, Europe

Volcanic rock formations on south eastern coast, Kleftiko, Milos, Cyclades islands, Greece, Mediterranean, Europe

Third crater from the summit of Irazu, highest in Costa Rica at 3432m, last erupted 1994, Parque Nacional Volcan Irazu, Cartago, Costa Rica, Central America

Patterns created by sea erosion on rocks at Rumbling Kern, near Howick, Alnwick, Northumberland, England, United Kingdom, Europe

Irregular blocky lava (a'a) and cinder cones of the volcanic landscape of Timanfaya National Park, Lanzarote, Canary Islands, Spain, Atlantic Ocean, Europe

Hiker on walkway admires the creek in the narrow limestone gorge, Aare Gorge, Bernese Oberland, Canton of Berne, Switzerland, Europe

Red rock formations and jangada boat on the seafront of Canoa Quebrada, Canoa Quedrada, Ceara', Brazil, South America

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

Views from the Nadab lookout, at the sacred Aboriginal site of Ubirr, Kakadu National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific

Cheddar Gorge tourist attraction, limestone rock formations, Somerset, England, United Kingdom, Europe

Remarkable Rocks, Flinders Chase National Park, Kangaroo Island, South Australia, Australia, Pacific

Sof Omar cave, downstream maze, daylight in through multiple entrances, Southern Highlands, Ethiopia, Africa

Red beach, Akrotiri, island of Santorini (Thira), Cyclades Islands, Aegean, Greek Islands, Greece, Europe

People canoeing near Tham Law (tube cove), Ao Phang-Nga Marine Park, Phang Nga province, Thailand, Southeast Asia, Asia

Old Man of Hoy, sandstone sea stack 137m high, with ferry in background, Hoy, Orkney Islands, Scotland, United Kingdom, Europe

Tourist standing on rock cliff looking at Band-I-Zulfiqar the main lake, Band-E- Amir (Bandi-Amir) (Dam of the King) crater Lakes, Bamian province, Afghanistan, Asia

Bhimbetka Caves with Neolithic paintings in rock shelters in sandstone, Obaidullaganj hills, Bhopal, Madhya Pradesh, India, Asia

Natural rock archway carved by the sea through limestone rock at Cuevas del Mar (sea caves) beach, near Llanes, Asturias, Spain, Europe

Giants Causeway, UNESCO World Heritage Site, County Antrim, Ulster, Northern Ireland, United Kingdom, Europe

Moss covered lava beds surround Snaefellsjokull, an active strato volcano capped in snow and ice, on the Snaefellsnes Peninsula, North West area, Iceland, Polar Regions

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

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

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

Tufa towers at Lac Abhe (Abbe), formed by hot springs beneath old lake at higher level, Afar Triangle, Djibouti, Africa

Lake of the Clouds, Carlsbad Caverns National Park, UNESCO World Heritage Site, New Mexico, United States of America, North America

Cooled lava from recent eruption, Kilauea Volcano, Hawaii Volcanoes National Park, UNESCO World Heritage Site, Island of Hawaii (Big Island), Hawaii, United States of America, North America

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

Folded layers of Jurassic sedimentary limestone and marl rocks in the cliffs at Vega beach, Ribadesella, Asturias, Spain, Europe

Snow on pinnacles and rock formations in the Bryce Canyon National Park in Utah, United States of America, North America

Remarkable Rocks, Flinders Chase National Park, Kangaroo Island, South Australia, Australia, Pacific

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

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

Lava beds surround Snaefellsjokull, an active strato volcano capped in snow and ice, on the Snaefellsnes Peninsula, North West area, Iceland, Polar Regions

Uluru (Ayers Rock), 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

Yellow and orange volcanic rock, Nisyros (Nisiros) (Nissyros), Dodecanese islands, Greece, Mediterranean, Europe

Erosion with volcanic tuff pillars, Pasabagi, near Goreme, Cappadocia, Anatolia, Turkey, Asia Minor, Asia

Stromatolites, one of the most ancient life forms on earth, mats of micro-organisms that become rock-like structures through accretion of calcium carbonate, in highly saline lagoons like here in Lake Thetis, Cervantes, Dandaragan Shire, Western Australia, Australia, Pacific

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

Hoodoos, Bryce amphitheater, Bryce Canyon National Park, Utah, United States of America (U.S.A.), 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

Volcanic rocks and beach at Paleokori, southern coast, Milos, Cyclades islands, Greece, Mediterranean, Europe

Kilauea volcano crater showing solidified ropy lava called pahoehoe, The Big Island, Hawaii, Hawaiian Islands, United States of America, North America

Yesnaby Castle sea stack, rock eroded by the sea, Mainland, Orkney Islands, Scotland, United Kingdom, Europe

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

Balanced Rock, a pinnacle of red sandstone caused by erosion, in the Arches National Park in Utah, United States of America, North America