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

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

Rock formation called 'the finger of Allah', Akakus, Sahara desert, Fezzan, Libya, North Africa, Africa

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

View of Praia do Conceicao beach and Morro do Pico in the background, Parque Nacional de Fernando de Norohna, Fernando de Noronha, Pernambuco, Brazil, South America

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

Through the Bocche di Vulcano, facing the crater on Vulcano, Aeolian Islands, UNESCO World Heritage Site, island of Sicily, Italy, Mediterranean, Europe

Tourist and locals at the Magenta cliffs near Shahr-e-Zohak (Red City), between Kabul and Bamiyan (the southern route), Bamiyan province, Afghanistan, Asia

Entrance to Fingal's Cave, columnar basalt rock, Island of Staffa, Argyllshire, Inner Hebrides, Scotland, United Kingdom, Europe

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

Folded limestone and shale, Jurassic period, Stair Hole, Lulworth, Dorset, England, United Kingdom, Europe

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

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

View of the Pitons volcanic mountains, with bougainvillea flowers in foreground, St. Lucia, Windward Islands, West Indies, Caribbean, Central America

Sunrise with fishing boats at Land's End, Cabo San Lucas, Baja California Sur, Gulf of California, Mexico, North America

View of Koh Ping-gan from Koh Ta Poo, known as James Bond island, Phang-Nga Bay, Thailand, Southeast Asia, Asia

View of Koh Ping-gan from Koh Ta Poo, known as James Bond island, Phang-Nga Bay, Thailand, Southeast Asia, Asia

White Cloud Scenic Area, Mount Huangshan (Yellow Mountain), UNESCO World Heritage Site, Anhui Province, China, Asia

Zodiac cruises through a natural arch of columnar basalt on the southern coast of Disko Island, Kuannersuit, Greenland, Polar Regions

Limestone pavements near Chapel-le-Dale, Yorkshire Dales, National Park, Yorkshire, England, United Kingdom, Europe

Limestone pavements near Chapel-le-Dale, Yorkshire Dales, National Park, Yorkshire, England, United Kingdom, Europe

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

Sunset at Eshaness basalt cliffs, with Moo Stack on left, and deeply eroded coast with caves, blowholes and stacks, Northmavine, Shetland Islands, Scotland, United Kingdom, Europe

Limestone pavements near Chapel-le-Dale, Yorkshire Dales National Park, Yorkshire, England, United Kingdom, Europe

Hiking trail and rocky peaks on Cradle Mountain on the Overland Track, Cradle Mountain Lake St. Clair National Park, part of Tasmanian Wilderness, UNESCO World Heritage Site, Tasmania, Australia, Pacific

Miniloc Island, swimming in Big Lagoon, limestone rock formations, Bacuit Bay, El Nido Town, Palawan Province, Philippines, Southeast Asia, Asia

Miniloc Island, Big Lagoon, limestone rock formations and white sand beach, Bacuit Bay, El Nido Town, Palawan Province, Philippines, Southeast Asia, Asia

Miniloc Island, big lagoon and limestone rock formations, Bacuit Bay, El Nido Town, Palawan Province, Philippines, Southeast Asia, Asia

Limestone plateau, karstic landscape, Burren region, County Clare, Munster, Republic of Ireland, Europe

Sea stacks at Duncansby Head, near John O'Groats, north-west tip of Scotland, Caithness, Scotland, United Kingdom, Europe

The Old Man of Storr, overlooking Loch Leathan and Raasay Sound, Trotternish, Isle of Skye, Inner Hebrides, Scotland, United Kingdom, Europe

Slopes of the Quiraing, a geological wonder, its distinctive features resulting from landslips of basalt lavas upon softer sedimentary rocks beneath, northeast coast of Trotternish Peninsula, Isle of Skye, Inner Hebrides, Scotland, United Kingdom, Europe

The Quiraing escarpment (The Table) ( The Prison), overlooking the Sound of Raasay, Trotternish, Isle of Skye, Inner Hebrides, Scotland, United Kingdom, Europe

Slopes of the Quiraing, a geological wonder, its distinctive features resulting from landslips of basalt lavas upon softer sedimentary rocks beneath, northeast coast of Trotternish Peninsula, Isle of Skye, Inner Hebrides, Scotland, United Kingdom, Europe

Limestone plateau at sunset, karstic landscape, Burren region, County Clare, Munster, Republic of Ireland, Europe

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

Malham Cove, Malham, Yorkshire Dales National Park, North Yorkshire, England, United Kingdom, Europe

Street with white houses under a rock in Setenil de las Bodegas, Pueblos Blancos region, Andalusia, Spain, Europe

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

Rock strata in cliffs in Paria River Valley, Grand Staircase-Escalante National Monument, near Page, Arizona, United States of America, North America

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

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

Rift where earth is splitting at plate boundary, Grotagja, Lake Myvatn region, north east area, Iceland, Polar Regions

Limestone pavement, Malham, Yorkshire Dales National Park, North Yorkshire, Yorkshire, England, United Kingdom, Europe

Hot air balloon taking off with tourists on board for a flight over the famous volcanic tufa rock formations around Goreme, Cappadocia, Anatolia, Turkey, Asia Minor, Eurasia

Columnar structures, created during cooling of basalt lava, with an intrusion or dyke of darker rock in the foreground, near Bombo Beach, Kiama, south coast, New South Wales, Australia, Pacific

Columnar basalt lava with Fingal's Cave cut into it by sea, Staffa, off west coast of Mull, Inner Hebrides, Scotland, United Kingdom, Europe

Terraced travertine thermal pools, Pamukkale, UNESCO World Heritage Site, Anatolia, Turkey, Asia Minor, Eurasia

Terraced travertine thermal pools, Pamukkale, UNESCO World Heritage Site, Anatolia, Turkey, Asia Minor, Eurasia

Little tourist boat ships beside a large monolith in the Avacha Bay near Petropavlovsk-Kamchatsky, Kamchatka, Russia, Eurasia

Little tourist boat ships beside a large monolith in the Avacha Bay near Petropavlovsk-Kamchatsky, Kamchatka, Russia, Eurasia

Iao Needle, also known as the Phallic stone of Kanaloa, Maui, Hawaii, United States of America, Pacific

The beehive-like mounds, Purnululu National Park, UNESCO World Heritage Site, Bungle Bungle Mountain Range, Western Australia, Australia, Pacific

Thrombolites, a variey of microbialite or living rock that produce oxygen and deposit calcium carbonate, similar to some of the earliest fossil forms of life found on Earth, Lake Clifton, Yalgorup National Park, Mandurah, Western Australia, Australia, Pacific