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Water rich in blue-green algae (cyanobacteria), mineral salts and fine silica mud at the geothermal spa that owes its existence to the Svartsengi geothermal power plant, Blue Lagoon, near Reykjavik, Iceland, Polar Regions

Grand Canyon from the South Rim, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, USA, North America

Vineyards on hillsides on the north coast near Ribeira da Janela, island of Madeira, Portugal, Atlantic, Europe

Castlerigg Stone Circle (The Druid's Circle), Lake District National Park, Cumbria, England, UK, Europe

Remarkable Rocks, Coast Kangaroo Island, Flinders Chase N.P., Kangaroo Island, South Australia, Australia

Star tracing over Monument Valley, tracing stars moving round the North Star, Monument Valley, an area in Utah and Arizona, United States of America (U.S.A.), North America

Rock formation known as Swirls on Colorado Plateau, Arizona, United States of America (U.S.A.), North America

Sandstone wave, Paria Canyon, Vermillion Cliffs Wilderness, Arizona, United States of America (U.S.A.), North America

Sandstone wave, Paria Canyon, Vermillion Cliffs Wilderness, Arizona, United States of America (U.S.A.), North America

Turret Arch through North Window at sunrise, Arches National Park, Moab, Utah, United States of America (U.S.A.), North America

Footbridge, White Cloud scenic area, Huang Shan (Yellow Mountain), UNESCO World Heritage Site, Anhui Province, China, Asia

Walking Fairyland Bridge, White Cloud scenic area, Huang Shan (Yellow Mountain), UNESCO World Heritage Site, Anhui Province, China, Asia

Silhouette of pine tree, White Cloud scenic area, Huang Shan (Mount Huangshan) (Yellow Mountain), UNESCO World Heritage Site, Anhui Province, China, Asia

Rock carved granite image of the 7m tall standing Buddha, Gal Vihara, Polonnaruwa (Polonnaruva), UNESCO World Heritage Site, Sri Lanka, Asia

The Talati de Dalt, prehistoric, neolithic remains of Talayotic culture, Menorca (Minorca), Balearic Islands, Spain, Mediterranean, Europe

Sarakiniko volcanic rock formations at sunset, island of Milos, Cyclades, Greek Islands, Greece, Europe

Lower Aysgarth Falls near Hawes, Wensleydale, Yorkshire Dales National Park, Yorkshire, England, United Kingdom, Europe

Dawn view over North Sea from beach at Marsden Bay, showing natural rock arch in Marsden Rock, South Shields, Tyne and Wear, England, United Kingdom, Europe

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

Hexagonal basalt columns of the Giant's Causeway, UNESCO World Heritage Site, and Area of Special Scientific Interest, near Bushmills, County Antrim, Ulster, Northern Ireland, 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

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

Tennyson Down, Black Rock and Highdown Cliffs from Freshwater Bay, Isle of Wight, England, United Kingdom, Europe

Rock formations (flysch) at low tide on coast between Zumaia and Deba, Costa Vasca, Basque country, Euskadi, Spain, Europe

Mount Hayden from Point Imperial, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

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

Karst limestone rock formations at Zhangjiajie Forest Park, Wulingyuan Scenic Area, UNESCO World Heritage Site, Hunan Province, China, Asia

The light of the setting sun illuminates the unusual architecture of Blackchurch Rock, which lies under cliffs between Clovelly and Hartland Point, Culm Coast, North Devon, England, United Kingdom, Europe

The light of the setting sun illuminates the unusual architecture of Blackchurch Rock, which lies under cliffs between Clovelly and Hartland Point, Culm Coast, North Devon, England, United Kingdom, Europe

Lanyon Quoit burial chamber, Madron, near Penzance, Lands End, Cornwall, England, United Kingdom, Europe

Lanyon Quoit burial chamber, Madron, near Penzance, Lands End, Cornwall, England, United Kingdom, Europe

November 13, 2007 - Moeraki Boulders, round septarian concretions created by cementation of Paleocene mudstone of the Moeraki formation, Koekohe Beach, New Zealand.

November 13, 2007 - Moeraki Boulders, spherical septarian concretions created by cementation of Paleocene mudstone of the Moeraki formation, Koekohe Beach, New Zealand.

November 13, 2007 - Moeraki Boulders, spherical septarian concretions created by cementation of Paleocene mudstone of the Moeraki formation, Koekohe Beach, New Zealand.

Woman in a niqab at Face Rock, a sandstone rock formation in shape of human head profile, Hegra, UNESCO, AlUla, Medina Province, Saudi Arabia

Stone formation at Salar de Tara y Aguas Calientes I, Los Flamencos National Reserve, Antofagasta Region, Chile, South America

Red Wall Bridge crossing Roaring Springs Canyon on North Kaibab Trail, Grand Canyon North Rim, UNESCO, Arizona, United States of America

View of Unfinished Obelisk in Aswan quarry on a sunny day, Aswan, Nubia, Egypt, North Africa, Africa

The stone formation Tres Marias, Valle de le Luna, Los Flamencos National Reserve, Antofagasta Region, 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.

Sandstone Wave, Paria Canyon, Vermillion Cliffs Wilderness, Arizona, United States of America (U.S.A.), North America

Elevated view over the volcanic tufa rock formations surrounding Goreme, Cappadocia, Anatolia, Turkey, Asia Minor, Eurasia

The ruined engine house of Carn Galver tin mine against the afternoon light, near Pendeen, Cornwall, Great Britain.

Stone marker at Wulao Feng (Five-Old-Man Peak) in Lushan (Mount Lu), UNESCO, Jiujiang City, Jiangxi, China

Woman practising yoga poses among sandstone rock formation in the desert canyons of the Ashar Valley, Medina Province, Saudi Arabia

Tomb carved into sandstone rock of Jabal Banat (Qasr Al-Bint) area in site of Hegra (Madain Salih), UNESCO, AlUla, Medina Province, Saudi Arabia

Basalt boulders and cliffs in a section of Johnson Canyon halfway between the Bainbridge Steel Dam and Stone Dam near Ash Fork Arizona in the Kaibab National Forest.

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 view of rocks cliffs and sea from the north coast road, island of Madeira, Portugal, Atlantic, Europe

Sandstone wave, Paria Canyon, Vermillion Cliffs Wilderness, Arizona, United States of America (U.S.A.), North America

Oia village and red volcanic rocks, Oia, island of Santorini (Thira), Cyclades Islands, Greek Islands, Greece, Europe

Sandstone cliff formations at sunrise on Isla San Jose, Baja California Sur, Sea of Cortez, Mexico, 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.

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 Temple, Mt. Jerusalem and Lake Salome, Walls of Jerusalem National Park, Tasmania, Australia, Pacific

The Callanish (Calanais) Standing Stones, the Neolithic monument in Callanish, Isle of Lewis, Outer Hebrides, Scotland, United Kingdom, Europe

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

The stone formation Tres Marias, Valle de le Luna, Los Flamencos National Reserve, Antofagasta Region, Chile, South America

Taula de Torre Trencada, prehistoric, neolithic remains of Talayotic culture, Menorca (Minorca), Balearic Islands, Spain, Mediterranean, Europe

Sandstone wave, Paria Canyon, Vermillion Cliffs Wilderness, Arizona, United States of America (U.S.A.), North America