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Dry stone walls, Inishmore, largest of the Aran Islands, Galway Bay, County Galway, Connacht, Republic of Ireland

Petrified forest, Agia Marina, Agios Nikolaos Geopark, beach with turquoise water in the south of Greece, Greece

Looking down on the deep blue Katsura River, in the autumnal forests in Arashiyama of Kyoto, Honshu, Japan, Asia

Devil's Bridge, geological limestone rock formation and arch, Willikies, Antigua, Antigua and Barbuda, Leeward Islands, West Indies, Caribbean, Central America

View from Calderon Honda crater of lava rock ruins and volcanic cones of the north, Lajares, Fuerteventura, Canary Islands, Spain, Europe

Late afternoon light on the Crater Lake of the Crater Lake National Park, Oregon, United States of America, North America

The colourful hills of the Painted Hills unit in the John Day Fossil Beds National Monument, Oregon, United States of America, North America

The intertidal zone of the Quantock Coast, West Somerset, contains an abundance of geology and wildlife. It is a Site of Special Scientific Interest (SSSI) and is of international geological importance.

A dry waterfall on the west side of Hamilili Point, Hamilili being a Zuni word for petrified wood, next to a hoodoo on the south end of Petrified Forest National Park, Arizona, United States of America, North America

Delicate Arch at golden hour, Arches National Park, Moab, Grand County, Utah, United States of America, North America

Multicoloured strata hill in the Painted Hills unit in the John Day Fossil Beds National Monument, Oregon, United States of America, North America

The North Valley below the Blue Mesa in Petrified Forest National Park, Arizona, United States of America, North America

Bighorn sheep petroglyph, Petrified Forest National Park, Arizona, United States of America, North America

Gnalloden reflected in meltwater pond at Hornsund, Spitsbergen, Svalbard, Arctic, Norway, Scandinavia, Europe

Marble Cathedral, Santuario de la Naturaleza Capillas de Marmol, General Carrera Lake, Aysen Region, Patagonia, Chile, South America

The intertidal zone of the Quantock Coast, West Somerset, contains an abundance of geology and wildlife. It is a Site of Special Scientific Interest (SSSI) and is of international geological importance.

Steam rising from side of Mount Tongariro, Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific

Natural arch, Queens Garden Trail, Bryce Canyon National Park, Utah, United States of America, North America

Milky Way and person under Delicate Arch, Arches National Park, Moab, Grand County, Utah, United States of America, North America

Multicoloured strata in the Painted Hills unit in the John Day Fossil Beds National Monument, Oregon, United States of America, North America

Cliff Geyser erupting in the Black Sand Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

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

A rock spire sculpted by the wind on Crystal Mesa west of Hamilili Point in Petrified Forest National Park, Arizona, United States of America, North America

Flute player pictograph, Honanki Heritage Site, Coconino National Forest, Arizona, United States of America, North America

Milky Way above Delicate Arch, Arches National Park, Moab, Grand County, Utah, United States of America, North America

White travertine basins at sunset, Pamukkale, UNESCO World Heritage Site, Anatolia, Turkey, Asia Minor, Eurasia

Furnas Valley, a site of bubbling hot springs and fumaroles on the Azorean capital island of Sao Miguel, Azores, Portugal, Europe

Geological Devil's Bridge, a natural arch carved by the sea from soft and hard limestone ledges of the Antigua formation, Antigua, Leeward Islands, West Indies, Caribbean, Central America

Crumbling islands of rock near Hamilili Point in Petrified Forest, Arizona, United States of America, North America

Sunrise at Font's Point, Anza-Borrego Desert State Park, California, United States of America, North America

Petrified wood and an eroded hill, Petrified Forest National Park, Arizona, United States of America, North America

Rock towers with coastal landscape of Sardinia in the background, Sardinia, Italy, Mediterranean, Europe

Gran Cratere (The Large Crater), Vulcano Island, Aeolian Islands, UNESCO World Heritage Site, north of Sicily, Italy, Mediterranean, Europe

Sulphur and fumarole smoke on volcano Gran crater, Vulcano Island, Aeolian Islands, UNESCO World Heritage Site, north of Sicily, Italy, Mediterranean, Europe

Sulphur and fumaroles smoke on volcano Gran Cratere, Vulcano Island, Aeolian Islands, UNESCO World Heritage Site, north of Sicily, Italy, Mediterranean, Europe

Woman rapelling down a giant arch, canyoneering, Moab, Utah, United States of America, North America

Delicate Arch with sun and clouds at golden hour, Arches National Park, Moab, Grand County, Utah, United States of America, North America

Daisy Geyser, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Colourful Emerald Pool, Black Sand Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Woman rapelling down a giant arch, canyoneering, Moab, Utah, United States of America, North America

Furnas Valley, a site of bubbling hot springs and fumaroles on the Azorean capital island of Sao Miguel, Azores, Portugal, Europe

Grand Prismatic Spring, Midway Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

La Pared surf beach and the Parque Natural Jandia mountains beyond on the southwest coast, La Pared, Fuerteventura, Canary Islands, Spain, Atlantic, Europe

The colourful hills of the Painted Hills unit in the John Day Fossil Beds National Monument, Oregon, United States of America, North America

Mighty John Day River flowing through the Sheep Rock unit in the John Day Fossil Beds National Monument, Oregon, United States of America, North America

Marble Cathedral, Santuario de la Naturaleza Capillas de Marmol, General Carrera Lake, Aysen Region, Patagonia, Chile, South America

Panoramic of The Seven Colored Earth Geopark, volcanic geological formations, Chamarel, Black River, Mauritius, Indian Ocean, Africa

Multicoloured strata hill in the Painted Hills unit in the John Day Fossil Beds National Monument, Oregon, United States of America, North America

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

View of Gran Cratere and Finicudi Island, Vulcano Island, Aeolian Islands, UNESCO World Heritage Site, north of Sicily, Italy, Mediterranean, Europe

Caleta Negra (Black Bay) a popular boat trip and walk with its distinctive sedimentary and lava strata, Ajuy, Fuerteventura, Spain, Atlantic, Europe

Peoples at Delicate Arch at golden hour, Arches National Park, Moab, Grand County, Utah, United States of America, North America

The Giant's Causeway rises out of the Atlantic late at night as the last light of the sun disappears below the horizon, County Antrim, Northern Ireland, United Kingdom, Europe

Cave in Dafines bay, Peninsula of Karaburun, within the Karaburun-Sazan Marine Parc, Vlore Bay, Albania, Europe

The Cliff Palace Indian dwelling, Mesa Verde National Park, UNESCO World Heritage Site, Colorado, United States of America, North America

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

Sulphur and fumarole smoke on volcano Gran crater, Vulcano Island, Aeolian Islands, UNESCO World Heritage Site, north of Sicily, Italy, Mediterranean, Europe

Multicoloured strata hill in the Painted Hills unit in the John Day Fossil Beds National Monument, Oregon, United States of America, North America

Stone wall of the Window section, Arches National Park, Utah, United States of America, North America

Chilean Flamingo (Phoenicopterus chilensis), Laguna Chaxa, Salar de Atacama, Atacama Desert, Chile, South America

Devil's Bridge, geological limestone rock formation and arch, Willikies, Antigua, Antigua and Barbdua, Leeward Islands, West Indies, Caribbean, Central America

View over the Sawtooth National Forest north of Sun Valley, Idaho, United States of America, North America

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

A pointed peak of bentonite in Hamilili Valley on the south end of Petrified Forest National Park, Arizona, United States of America, North America

A view of the island of Deserta Grande, in the Ilhas Desertas, near the city of Funchal, Madeira, Portugal, Atlantic, Europe

View over the cliffs of the Zion National Park and the Angel's Landing trail, Zion National Park, Utah, United States of America, North America

Hand pictographs, Honanki Heritage Site, Coconino National Forest, Arizona, United States of America, North America

View over the Lewis River, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Multicoloured strata in the Painted Hills unit in the John Day Fossil Beds National Monument, Oregon, United States of America, North America

Crested Pool, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Rock formation on the way to Delicate Arch, Arches National Park, Moab, Grand County, Utah, United States of America, North America

Volcanic rock headland and sandy beach south of this village on the north west coast, El Cotillo, Fuerteventura, Canary Islands, Spain, Atlantic, Europe

Fiery Furnace, a maze like passageway, Arches National Park, Utah, United States of America, North America

Jackson Lake in the Teton range in the Grand Teton National Park, Wyoming, United States of America, North America

The Cliff Palace Indian dwelling, Mesa Verde National Park, UNESCO World Heritage Site, Colorado, United States of America, North America

Redrock sandstone formations in the Kodachrome Basin State Park, Utah, United States of America, North America

Delicate Arch with sun and clouds at golden hour, Arches National Park, Moab, Grand County, Utah, United States of America, North America

Cathedral Rock reflected in Oak Creek, Crescent Moon Picnic Area, Coconino National Forest, Arizona, United States of America, North America

A view of the island of Deserta Grande, in the Ilhas Desertas, near the city of Funchal, Madeira, Portugal, Atlantic, Europe

View over the cliffs of the Zion National Park and the Angel's Landing path, Zion National Park, Utah, United States of America, North America