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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

Hverarondor Hverir mud pots, steam vents, and sulphur deposits on the north coast of Iceland, Polar Regions

Details of the salt deposits in the Salar de Uyuni salt flat and the Andes mountains in the distance in south-western Bolivia, Bolivia, South America

Hverarondor Hverir mud pots, steam vents, and sulphur deposits on the north coast of Iceland, Polar Regions

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

Details of the salt deposits in the Salar de Uyuni salt flat, southwestern Bolivia, Bolivia, South America

Geothermal Terraces with mineral deposit run off, Whakarewarewa thermal village, Rotorua, North Island, New Zealand, Pacific

Colourful pools of calcite deposits formed at Huanglong temple, Huanglong National Park, UNESCO World Heritage Site, Sichuan Province, China, Asia

November 30, 2012 - Glowing Rerombola lava dome with incandescent rockfall deposit, Paluweh volcano, Flores, Indonesia.

January 24, 2012 - Yellow sulphurous deposits resulting from degassing coating scoria cone formed during eruption on Nyamuragira Volcano, Democratic Republic of Congo.

February 11, 2008 - Dallol geothermal area, egg-shaped fumarole deposits formed in salt deposits of brine hot springs, Danakil Depression, Ethiopia.

January 27, 2011 - Dallol geothermal area, potassium salt deposits formed by brine hot springs, Danakil Depression, Ethiopia.

January 27, 2011 - Dallol geothermal area, potassium salt deposits formed by brine hot springs, Danakil Depression, Ethiopia.

January 27, 2011 - Dallol geothermal area, potassium salt deposits formed by brine hot springs, Danakil Depression, Ethiopia.

January 27, 2011 - Dallol geothermal area, potassium salt deposits formed by brine hot springs, Danakil Depression, Ethiopia.

January 27, 2011 - Dallol geothermal area, potassium salt deposits formed by brine hot springs, Danakil Depression, Ethiopia.

January 27, 2011 - Dallol geothermal area, terraces, potassium salt deposits formed by brine hot springs, Danakil Depression, Ethiopia.

January 27, 2011 - Dallol geothermal area, terraces of potassium salt deposits formed by brine hot springs, Danakil Depression, Ethiopia.

January 27, 2011 - Dallol geothermal area, potassium salt deposits formed by brine hot springs, Danakil Depression, Ethiopia.

January 27, 2011 - Dallol geothermal area, potassium salt deposits formed by brine hot springs, Danakil Depression, Ethiopia.

Salt deposit on water surface of Lake Afrera (Lake Afdera), Danakil Depression, Afar Region, Ethiopia, Africa

Aerial photography of an esker, a sandy ridge formed by subglacial deposits of sediment in the last Ice Age, in Manitoba, Canada, North America

Mineral deposits from geothermal steam vents at Te Puia, Gisborne District, North Island, New Zealand, Pacific

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

Sulphur deposits in a piece of lava rock on the slopes of Mount Lokon volcano near Tomohon city, Gunung Lokon, Tomohon, North Sulawesi, Indonesia, Southeast Asia, Asia

Colourful pools of calcite deposit frozen at Huanglong National Park, UNESCO World Heritage Site, Sichuan Province, China, Asia

Steaming fumarole with sulphur deposits in Tompaluan active crater by Mount Lokon volcano near Tomohon city, Gunung Lokon, Tomohon, North Sulawesi, Indonesia, Southeast Asia, Asia

Shetland sheep, Villians of Hamnavoe, cliff tops shaped by storm deposits, Eshaness, Northmavine, Shetland Isles, Scotland, United Kingdom, Europe

Crystaline deposit salt pillars in the corrugated Badlands landscape at Devils Golf Course, Death Valley National Park, California, United States of America, North America

Colourful pools of calcite deposit frozen at Huanglong National Park, UNESCO World Heritage Site, Sichuan Province, China, Asia

Steam and sulphur deposits at the Io-San sulphur vents in the National Park on Hokkaido, Japan, Asia

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

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

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

Salt and algal deposits at Lake Clifton, one of a string of coastal lakes south of Mandurah, Yalgorup National Park, Mandurah, Western Australia, Australia, Pacific

The hot blue waters and mineral deposits of the Blue Lagoon ipopular with bathers and good for skin complaints, Svartsengi, Iceland, Polar Regions

Travertine calcite deposits, Minerva Terrace, Mammoth Hot Springs and Terraces, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America (U.S.A.), North America

Travertine calcite deposits on the Canary Spring terraces, Mammoth Hot Springs and Terraces, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Sulphur deposits at 'Bumpass Hell', the largest area of mudpots and steam vents at this national park around Lassen Peak volcano, Lassen volcanic national park, California, Usa

A road eroded and dropping off into the North sea at Happisburgh, Norfolk, a rapidly eroding section of coastline, UK.

A road eroded and dropping off into the North sea at Happisburgh, Norfolk, a rapidly eroding section of coastline, UK.

Tar sands deposits being mined at the Syncrude mine north of Fort McMurray, Alberta, Canada, North America

Tar sands deposits being mined at the Syncrude mine north of Fort McMurray, Alberta, Canada, North America

Tar sands deposits being mined at the Syncrude mine north of Fort McMurray, Alberta, Canada, North America

Tar sands deposits being mined at the Syncrude mine north of Fort McMurray, Alberta, Canada, North America

Tar sands deposits being mined at the Syncrude mine north of Fort McMurray, Alberta, Canada, North America

Tar sands deposits being mined at the Syncrude mine north of Fort McMurray, Alberta, Canada, North America

The 1500ft deep Upheaval Dome, possibly caused by the movement of salt deposits under the sandstone, in the Island in the Sky area of this spectacular park, Canyonlands National Park, Utah, United States of America (USA), North America

The 1500ft deep Upheaval Dome, possibly caused by the movement of salt deposits under the sandstone, in the Island in the Sky area of this spectacular park, Canyonlands National Park, Utah, United States of America (USA), North America

Tar sands deposits being mined at the Syncrude mine north of Fort McMurray, Alberta, Canada, North America

Sulphur deposits at 'Bumpass Hell', the largest area of mudpots and steam vents at this national park around Lassen Peak volcano, Lassen volcanic national park, California, Usa

Sulphur deposits at 'Bumpass Hell', the largest area of mudpots and steam vents at this national park around Lassen Peak volcano, Lassen volcanic national park, California, Usa

Tar sands deposits exposed in the side of the Athabasca River, Fort McMurray, Alberta, Canada, North America

Tar sands deposits exposed in the side of the Athabasca River, Fort McMurray, Alberta, Canada, North America

Tar sands deposits being mined at the Syncrude mine north of Fort McMurray, Alberta, Canada, North America