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Geologists taking mineral samples on Gran Cratere (The Great Crater), Vulcano Island, Aeolian Islands, UNESCO World Heritage Site, Sicily, Italy, Mediterranean, Europe

Valle de los Hongos (Mushroom Rocks) formed of volcanic ash, Creel, Chihuahua, Mexico, North America

Dramatic coastal geology at Nash Point on the Glamorgan Heritage Coast, South Wales, United Kingdom, Europe

A burst of light briefly illuminates the pinnacles surrounding the Old Man of Storr against an approaching storm, Isle of Skye, Inner Hebrides, Scotland, United Kingdom, Europe

Elevated view of the town and the Hill of Seven Colours (Cerro de los Siete Colores), Purmamarca, Jujuy Province, Argentina, South America

Elevated view of the town and the Hill of Seven Colours (Cerro de los Siete Colores), Purmamarca, Jujuy Province, Argentina, South America

An evening view of the Giant's Causeway, UNESCO World Heritage Site, County Antrim, Ulster, Northern Ireland, United Kingdom, Europe

Tryfan, viewed from the top of Bristly Ridge on Glyder Fach, Snowdonia, Wales, United Kingdom, Europe

Minerals for sale to tourists as souvenirs on side of road in Tiz n Tichka Pass oer Atlas mountains, Morocco, North Africa, Africa

Columnar basalt lava at Giant's Causeway, UNESCO World Heritage Site, County Antrim, Northern Ireland, United Kingdom, Europe

Giant's Causeway, UNESCO World Heritage Site, Bushmills, County Antrim, on the north coast of Northern Ireland, Ulster, Northern Ireland, United Kingdom, Europe

Giant's Causeway, UNESCO World Heritage Site, Bushmills, County Antrim, on the north coast of Northern Ireland, Ulster, Northern Ireland, United Kingdom, Europe

Sunrise over the Old Man of Storr on the Isle of Skye, Inner Hebrides, Scotland, United Kingdom, Europe

Needle Rock, one of the basalt columns standing alongside the Old Man of Storr, Isle of Skye, Inner Hebrides, Scotland, United Kingdom, Europe

Neist Point lighthouse, perched on dramatic cliff tops on the west coast of the Isle of Skye, Inner Hebrides, Scotland, United Kingdom, Europe

Jagged basalt peaks near the Old Man of Storr on a foggy autumn morning, Isle of Skye, Inner Hebrides, Scotland, United Kingdom, Europe

Ecocentro, Puerto Madryn, The Welsh Settlement, Chubut Province, Patagonia, Argentina, South America

Ingleborough seen from the limestone pavement on Twistleton Scar, North Yorkshire, England, United Kingdom, Europe

Rio Pinturas Canyon, Cave of the Hands, UNESCO World Heritage Site, Patagonia, Province of Santa Cruz, Argentina, South America

Ilakaka sapphire mine, one of Earth's largest known alluvial sapphire deposits, Ilakaka, Ihorombe Region, Madagascar, Africa

Ilakaka sapphire mine, one of Earth's largest known alluvial sapphire deposits, Ilakaka, Ihorombe Region, Madagascar, Africa

Pinturas Canyon, Cave of the Hands, UNESCO World Heritage Site, Patagonia, Province of Santa Cruz, Argentina, South America

Stencil hand Paintings, Rio Pinturas Canyon, Cave of the Hands, UNESCO World Heritage Site, Patagonia, Province of Santa Cruz, Argentina, South America

Rock formation in the canyon of Piedra Parada (Gualjaina), Chubut Province, Patagonia, Argentina, South America

Footpath at Rio Pinturas Canyon, Cave of the Hands, UNESCO World Heritage Site, Patagonia, Province of Santa Cruz, Argentina, South America

Limestone cliffs above Malham Cove in the Yorkshire Dales National Park, Yorkshire, England, United Kingdom, Europe

Clifftop vista from Martin's Haven, Pembrokeshire Coast National Park, Wales, United Kingdom, Europe

Cactus plants inside Jardin de Cactus designed by Cesar Manrique, Guatiza, Lanzarote, Canary Islands, Spain, Atlantic, Europe

Sandstone hills and termite mounds in The Domes area of Purnululu National Park (Bungle Bungle), UNESCO World Heritage Site, Western Australia, Australia, Pacific

Hoodoos strongly lit by early morning sun with heavy cloud, Peekaboo Loop Trail in winter, Bryce Canyon National Park, Utah, United States of America, North America

Hiker on a horse trail in winter with hoodoos and rocks glowing in early morning light, Bryce Canyon National Park, Utah, United States of America, North America

Looking from Taormina towards Trupiano and the smoking 3350m high volcano of Mount Etna during an active phase, Trupiano, Sicily, Italy, Mediterranean, Europe

Visitors, steam and vivid colours, Grand Prismatic Spring, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

An active andesite stratovolcano on White Island, off the east side of North Island, New Zealand, Pacific

Evaporation of sea water in salt pans, Museo de la Sal (Salt Museum), Las Salinas del Carmen, Fuerteventura, Canary Islands, Spain, Atlantic, Europe

Haleakala Crater, in Haleakala National Park, Maui's dormant volcano, Hawaii, United States of America, Pacific, North America

Limestone desert landscape, Paraje Natural de Karst en Yesos de Sorbas, Almeria, Andalusia, Spain, Europe

Japanese warning sign on the crater rim of Mount Naka active volcano, Mount Aso, Kyushu, Japan, Asia

Heads carved into rocks at Enchanted Castle, Sciacca, Agrigento district, Sicily, Italy, Mediterranean, Europe

Crateri Silvestri, high angle view, Etna, UNESCO World Heritage Site, Etna, Sicily, Italy, Mediterranean, Europe

Volcanic landscape, Mount Etna, UNESCO World Heritage Site, Etna, Sicily, Italy, Mediterranean, Europe

View of lava fields and snow-capped peaks in the distance, Etna, Sicily, Italy, Mediterranean, Europe

Traditional sea salt production, Salinas de Janubio, Lanzarote, Canary Islands, Spain, Atlantic, Europe

Montana de Medio, mountain, Los Ajaches mountain range, Lanzarote, Canary Islands, Spain, Atlantic, Europe

Grape vines growing in black volcanic pits in La Geria, Lanzarote, Canary Islands, Spain, Atlantic, Europe

Atlantic coast in south west corner, Los Charcones, Caleta Negra bay, near Playa Blanca, Lanzarote, Canary islands, Spain, Atlantic, Europe

The Nant Ffrancon valley in spring backed by Foel Goch and the Glyderau mountains, Snowdonia National Park (Eryri), North Wales, United Kingdom, Europe

Johnston Canyon Creek, Banff National Park, Alberta, UNESCO World Heritage Site, Canada, North America

Dawn sky above Milford Sound, Fiordland National Park, UNESCO World Heritage Site, South Island, New Zealand, Pacific

Rocky seashore at Priest's Cove beneath Cape Cornwall, St. Just, Cornwall, England, United Kingdom, Europe