Sand
![Sand [[dune](https://upload.wikimedia.org/wikipedia/commons/8/8b/Libya_4608_Idehan_Ubari_Dunes_Luca_Galuzzi_2007.jpg)
The composition of sand varies, depending on the local rock sources and conditions, but the most common constituent of sand in inland continental settings and non-tropical coastal settings is silica (silicon dioxide, or SiO2), usually in the form of quartz.
Calcium carbonate is the second most common type of sand, for example, aragonite, which has mostly been created, over the past 500million years, by various forms of life, like coral and shellfish. For example, it is the primary form of sand apparent in areas where reefs have dominated the ecosystem for millions of years, as in the Caribbean. Somewhat more rarely, sand may be composed of calcium sulfate, such as gypsum and selenite, as is found in places such as White Sands National Park and Salt Plains National Wildlife Refuge in the U.S.
Sand is a non-renewable resource over human timescales, and sand suitable for making concrete is in high demand. Desert sand, although plentiful, is not suitable for concrete. Fifty billion tons of beach sand and fossil sand are used each year for construction. Provided by Wikipedia
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441by Sand, Anne-Sofie, Furberg, Anne-Sofie, Lian, Olaug S., Nielsen, Christopher S., Pettersen, Gunn, Winther, Anne, Emaus, NinaGet access
Published in Scandinavian Journal of Public Health (2017)
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442by Frands Otto Schjøth, Karina Krarup Sand, Else Dam Moberg, Sebastian Tappe, Agnete Steenfelt, Tapani Tukiainen, Karsten SecherGet access
Published 2008
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443by Räisänen, Petri, Merikanto, Joonas, Makkonen, Risto, Savolahti, Mikko, Kirkevåg, Alf, Sand, Maria, Seland, Øyvind, Partanen, Antti-IlariGet access
Published in Atmospheric Chemistry and Physics (2022)
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444by Winther, Jan-Gunnar, Bruland, Oddbjørn, Sand, Knut, Gerland, Sebastian, Marechal, David, Ivanov, Boris, Glowacki, Piotr, König, MaxGet access
Published 2008
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445by Sand, Anne-Sofie, Furberg, Anne-Sofie, Lian, Olaug S, Nielsen, Christopher Sivert, Pettersen, Gunn, Winther, Anne, Emaus, NinaGet access
Published in Scandinavian Journal of Public Health (2017)
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446by P. Räisänen, J. Merikanto, R. Makkonen, M. Savolahti, A. Kirkevåg, M. Sand, Ø. Seland, A.-I. PartanenGet access
Published in Atmospheric Chemistry and Physics (2022)
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447
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448by Räisänen, Petri, Merikanto, Joonas, Makkonen, Risto, Savolahti, Mikko, Kirkevåg, Alf, Sand, Maria, Seland, Øyvind, Partanen, Antti-IlariGet access
Published in Atmospheric Chemistry and Physics (2022)
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449by Sand, Anne-Sofie, Furberg, Anne-Sofie, Lian, Olaug S, Nielsen, Christopher Sivert, Pettersen, Gunn, Winther, Anne, Emaus, NinaGet access
Published in Scandinavian Journal of Public Health (2017)
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450by Bjørn Hallvard Samset, Camilla Weum Stjern, Marianne Tronstad Lund, Christian Wilhelm Mohr, Maria Sand, Anne Sophie DalozGet access
Published in Earth's Future (2019)
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451by Winther, Jan-Gunnar, Bruland, Oddbjørn, Sand, Knut, Gerland, Sebastian, Marechal, David, Ivanov, Boris, Gøowacki, Piotr, König, MaxGet access
Published in Polar Research (2003)
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452by Bjørn Hallvard Samset, Camilla Weum Stjern, Marianne Tronstad Lund, Christian Wilhelm Mohr, Maria Sand, Anne Sophie DalozGet access
Published in Earth's Future (2019)
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453by Räisänen, Petri, Merikanto, Joonas, Makkonen, Risto, Savolahti, Mikko, Kirkevåg, Alf, Sand, Maria, Seland, Øyvind, Partanen, Antti-IlariGet access
Published 2022
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454by Räisänen, Petri, Merikanto, Joonas, Makkonen, Risto, Savolahti, Mikko, Kirkevåg, Alf, Sand, Maria, Seland, Øyvind, Partanen, Antti-IlariGet access
Published 2022
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455by Sand, Karina K., Waight, Tod E., Pearson, D. Graham, Nielsen, Troels F.D., Makovicky, Emil, Hutchison, Mark T.Get access
Published in Lithos (2009)
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456
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457by Linnell, John D.C., Solberg, Erling J., Brainerd, Scott, Liberg, Olof, Sand, Hakan, Wabakken, Petter, Kojola, IlpoGet access
Published 2003
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458by Linnell, John D.C., Solberg, Erling J., Brainerd, Scott, Liberg, Olof, Sand, Hakan, Wabakken, Petter, Kojola, IlpoGet access
Published 2003
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459
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460by Sand, Karina Krarup, Waight, Tod Earle, Pearson, D. Graham, Nielsen, Troels F.D., Makovicky, Emil, Hutchison, Mark T.Get access
Published in Lithos (2009)
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