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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321by Liston, Glen E., Winther, Jan-Gunnar, Bruland, Oddbjørn, Elvehøy, Hallgeir, Sand, KnutGet access
Published in Journal of Glaciology (1999)
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323by Winther, Jan-Gunnar, Elvehøy, Hallgeir, Bøggild, Carl Egede, Sand, Knut, Liston, GlenGet access
Published in Journal of Glaciology (1996)
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324by Ausilio, Giorgia, Wikenros, Camilla, Sand, Håkan, Wabakken, Petter, Eriksen, Ane, Zimmermann, BarbaraGet access
Published in Ecosphere (2022)
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325by Steenfelt, Agnete, Jensen, Sven M., Nielsen, Troels F.D., Sand, Karina KrarupGet access
Published in Lithos (2009)
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326by Teigen, Sverre Weberg, Skaare, Janneche Utne, Sand, Gunhild, Bjørge, Arne, Degre, EvaGet access
Published in Environmental Toxicology and Chemistry (1993)
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327by Ausilio, G., Wikenros, C., Sand, H., Wabakken, P., Eriksen, A., Zimmermann, B.Get access
Published in Ecosphere (2022)
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330by Amstrup, Ole, Frich, Alex Sand, Hansen, Tim Hesselballe, Pedersen, Knud, Thorup, KasperGet access
Published 2005
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331by Åkesson, Mikael, Liberg, Olof, Sand, Håkan, Wabakken, Petter, Bensch, Staffan, Flagstad, ØysteinGet access
Published in Molecular Ecology (2016)
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337by Hodne, Kjetil, von Krogh, Kristine, Weltzien, Finn-Arne, Sand, Olav, Haug, Trude M.Get access
Published in General and Comparative Endocrinology (2012)
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338by M. Sand, T. K. Berntsen, A. M. L. Ekman, H.-C. Hansson, A. LewinschalGet access
Published in Atmospheric Chemistry and Physics (2020)
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340by Cecilia Di Bernardi, Camilla Wikenros, Paolo Ciucci, Luigi Boitani, Håkan Sand, Mikael ÅkessonGet access
Published in Environmental DNA (2023)
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