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Watchman mountain, Watchman trail, Zion National Park, Utah, United States of America, North America

Tourists exploring colorful rocks at Artist's Palette, Death Valley National Park, Eastern California, California, United States of America, North America

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

Bend of Colorado River at Dead Horse Point, Dead Horse Point State Park, Utah, United States of America, North America

Galapagos sea lion (Zalophus wollebaeki) resting on lava at sunset in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Brash ice chokes the Lemaire Channel on the west side of the Antarctic peninsula in Antarctica, Polar Regions

Dunes at the Sharqiya Sands, formerly Wahiba Sands, desert region, Sultanate of Oman, Arabian Peninsula

Safari tour among the magnificent sandstone rock structures in the Sharaan Nature Reserve, AlUla, Medina Province, Saudi Arabia

Magnificent sandstone rock structure in the Sharaan Nature Reserve, AlUla, Medina Province, Saudi Arabia

Extraordinary sandstone rock structure called Dancing Rocks in the Sharaan Nature Reserve, AlUla, Medina Province, Saudi Arabia

Extraordinary sandstone rock structure called Dancing Rocks in the Sharaan Nature Reserve, AlUla, Medina Province, Saudi Arabia

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

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.

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.

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 small hill of gray bentonite clay that appears to be melting into the purple bentonite of Hamilili Valley on the south end of Petrified Forest National Park, Arizona, United States of America, North America

A view of the lava formation and rock forms on the island of Bartolome in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Archaeological site of Ollantaytambo, Ollantaytambo District, Sacred Valley, Urubamba Province, Cusco (Cuzco) Region, Peru, South America

Views of the abandoned whaling station in Prince Olav Harbor on South Georgia, Southern Ocean, Polar Regions

Sand dunes in desert at sunset, Huacachina, Ica District, Ica Province, Ica Region, Peru, South America

The endemic Galapagos marine iguana (Amblyrhynchus cristatus) in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Ubinas volcano reflected in a pool at salt flats, Salinas y Aguada Blanca National Reserve, Arequipa Province, Arequipa Region, Peru, South America

Grand Canyon, Mohave Point, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

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

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.

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.

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.

View from the summit of Crystal Mesa west of Hamilili Point in Petrified Forest National Park, Arizona, United States of America, North America

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

Nevado Ausangate in Andes, near Rainbow Mountain, near Uchullujllo, Pitumarca district, Canchis Province, Cuzco Region, Peru, South America

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

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.

Hoodoo spires rising above the valley below the south side of Blue Mesa in Petrified Forest National Park, Arizona, United States of America, North America

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

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

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

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

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

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

Geological formations shaped as sand dunes, The Seven Colored Earth Geopark, Chamarel, Black River, Mauritius, Indian Ocean, Africa

Red rock formations at sunrise, Coconino National Forest, Arizona, United States of America, North America

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

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

The colourful sandstone formations of the Bryce Canyon National Park in the late afternoon, Utah, United States of America, North America

Beautiful red sandstone formations in the Arches National Park, Utah, United States of America, North America

The colourful sandstone formations of the Bryce Canyon National Park in the late afternoon, Utah, United States of America, North America

The colourful sandstone formations of the Bryce Canyon National Park in the late afternoon, Utah, United States of America, North America

Beautiful red sandstone formations in the Arches National Park, Utah, United States of America, North America

The colourful sandstone formations of the Bryce Canyon National Park in the late afternoon, Utah, United States of America, North America

The colourful sandstone formations of the Bryce Canyon National Park in the late afternoon, Utah, United States of America, North America

The colourful sandstone formations of the Bryce Canyon National Park in the late afternoon, Utah, United States of America, North America

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

Cave diver lights airspace with flare, inspecting geological formations, Pont Den Gil cave, Menorca, Balearic Islands, Spain, Europe

The geological coastal formation known as 'Hole in the Wall' on the wild coast in a region of South Africa's Eastern Cape Province formerly known as the Transkei.

Night-time, moonlit view of the geological formation known as 'Hole in the Wall along the wild coast in a region of South Africa's Eastern Cape Province formerly known as the Transkei. Stars can be seen in the sky.

Sandstone formation, usa. Arizona, vermillion cliffs wilderness, paria canyon. North coyote buttes made from sandstone

The geological coastal formation known as 'Hole in the Wall' on the wild coast in a region of South Africa's Eastern Cape Province formerly known as the Transkei.

Interior of the Baradla-Domica cave system in the Aggtelek National park which stradles the border between Hungary and Slovakia.

Geology, usa. Arizona, paria canyon vermillion cliffs wilderness. North coyote buttes: the swirl. Made from navaho sandstone, formed by wind and weather

Interior of the Baradla-Domica cave system in the Aggtelek National park which stradles the border between Hungary and Slovakia.

Interior of the Baradla-Domica cave system in the Aggtelek National park which stradles the border between Hungary and Slovakia.

Ponderosa pine, pinus ponderosa, gelb-kiefer, gold-kiefer, ponderosa-kiefer, tree growing on sandstone, zion national park, utah, usa,

Interior of the Baradla-Domica cave system in the Aggtelek National park which stradles the border between Hungary and Slovakia.

Pentagonal rock extrusions on Pico de Ana Ferreira on the Portuguese Atlantic island of Porto Santo.

Pillar, geological calcareous formation on the wall of Anhumas Abyss, Bonito, Mato Grosso do Sul, Brazil, South America

08/04/2009. Spain, España, Canary Islands, Canarias, Tenerife, Los Roques de Garcia and Mount Teide. Volcanic landscape and rock formation with people. . Santa Cruz, Teide National Park, Tenerife Island. Canary Islands

03/04/2009. The town of Picos on Sao Tiago Island of the Cape Verdes. Landscape view of volcanic formations and residential buildings with church. . Praia, Picos town, Sao Tiago Island. Cape Verde

08/04/2009. Spain, España, Canary Islands, Canarias, Tenerife, Los Roques de Garcia and Mount Teide. Volcanic landscape and rock formation with people. . Santa Cruz, Teide National Park, Tenerife Island. Canary Islands

04/04/2009. Cape Verde, Cabo Verde, São Vicente, Mindelo, Monte VerdeSao Pedro, View from Monte Verde towards Praia Grande, volcanic formations. Mindelo, Mt Verde, Sao Vicente Island. Cape Verde Islands

08/04/2009. Spain, España, Canary Islands, Canarias, Tenerife, Los Roques de Garcia and Mount Teide. Volcanic landscape and rock formation with people. . Santa Cruz, Teide National Park, Tenerife Island. Canary Islands

03/04/2009. The town of Picos on Sao Tiago Island of the Cape Verdes. Landscape view of volcanic formations and residential buildings with church. . Praia, Picos town, Sao Tiago Island. Cape Verde

08/04/2009. Spain, España, Canary Islands, Canarias, Tenerife, Los Roques de Garcia and Mount Teide. Volcanic landscape and rock formation with people. . Santa Cruz, Teide National Park, Tenerife Island. Canary Islands

04/04/2009. Cape Verde, Cabo Verde, São Vicente, Mindelo, Monte VerdeSao Pedro, View from Monte Verde towards Praia Grande, volcanic formations. Mindelo, Mt Verde, Sao Vicente Island. Cape Verde Islands

03/04/2009. The town of Picos on Sao Tiago Island of the Cape Verdes. Landscape view of volcanic formations and residential buildings with church. . Praia, Picos town, Sao Tiago Island. Cape Verde

Sunrise on the volcanic tuft formations of Ensenada Grande, Isla Espiritu Santo, Baja California Sur, Mexico.

Gran Cenote de Tulum in Yucatan Peninsula, Quintana Roo, Mexico. There are thousands of cenotes dotted all over Mexico���s Yucatan Peninsula, and their existence is as much a defining characteristic of the region as is the distinct geological feature from which they result. Once revered by the ancient Mayans as sacred wells, they are now magnets for tourists, adventurers, and explorers alike.