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Severe erosion of loose Quaternary glacial sands on this coast that has retreated more than 500m since the1830s, Covehithe, Suffolk, England, United Kingdom, Europe

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

Karst limestone sea cliffs at Pria, with Picos de Europa mountains in the background, near Llanes, Asturias, Spain, Europe

Teide Mountain, Las Canadas del Teide National Park, Tenerife, Canary Islands, Spain, Atlantic, Europe

The Olgas, 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

Aerial view of the interior of the island of Kauai, including Waimea Canyon, Hawaii, United States of America, North America

Eshaness basalt cliffs, deeply eroded with caves, blowholes and stacks, Northmavine, Shetland Islands, Scotland, United Kingdom, Europe

Hikers on arch rock formation in Bryce Canyon Amphitheater, Bryce Canyon National Park, Utah, United States of America, North America

Hikers on arch rock formation in Bryce Canyon Amphitheater, Bryce Canyon National Park, Utah, United States of America, North America

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

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

Red rock formations of Morro Branco on the Ceara coastline, near Canoa Quedrada, Ceara', Brazil, South America

Uluru (Ayers Rock), 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

Oxara River tumbles down the Almannagja cliff face at Oxarafoss, Thingvellir National Park, UNESCO World Heritage Site, south-west Iceland (Sudurland), Iceland, Polar Regions

Slot canyon in red sandstone, Antelope Canyon, near Page, Arizona, United States of America (U.S.A.), North America

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

Gullies eroded into the Pierre shales below Loop Road, Sage Creek wilderness, Badlands National Park, South Dakota, 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

Stoura Pund cliffs and stacks of red sandstone, Eshaness, Northmavine, Shetland Islands, Scotland, United Kingdom, Europe

Rock formation called The Finger of Allah, Akakus, Sahara desert, Fezzan, Libya, North Africa, Africa

Faces in the rocks, Le Pere Trebeurden, at Trebeurden on the Cote de Granit Rose on the Cotes d'Amor, Brittany, France, Europe

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

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

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

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

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

Gaada Stack, a natural arch 45 m high, old red sandstone, Foula, Shetland Islands, Scotland, United Kingdom, Europe

Gaada Stack natural arch, 45 m high, at sunset, Foula, Shetland Islands, Scotland, United Kingdom, Europe

Rock cliffs and sand dunes in front of the fortress of Masada, in the Judean Desert, Israel, Middle East

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

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

The Screes, Lake Wastwater, Wasdale, Lake District National Park, Cumbria, England, United Kingdom, Europe

Early morning light on the Pinnacles, Handfast Point, Studland, Dorset, England, United Kingdom, Europe

Rocky Coast and Yesnaby castle, a sea stack, near Yesnaby, Mainland, Orkney Islands, Scotland, United Kingdom, Europe

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

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

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

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

Stoura Pund cliffs and stacks of red sandstone, Eshaness, Northmavine, Shetland Islands, Scotland, United Kingdom, Europe

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