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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261by Sand-Jensen, Kaj, Riis, Tenna, Markager, Stiig, Vincent, Warwick FGet access
Published in Canadian Journal of Fisheries and Aquatic Sciences (1999)
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272by Petrich, Christian, Sæther, Irina Vasiljeva, Lennart, Fransson, Sand, Bjørnar, Arntsen, BårdGet access
Published in Cold Regions Science and Technology (2015)
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273by Winther, J-G., Bruland, O., Sand, K., Killingtveit, Å., Marechal, D.Get access
Published in Polar Research (1998)
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274by Zimmermann, Barbara, Sand, Håkan, Wabakken, Petter, Liberg, Olof, Andreassen, Harry PeterGet access
Published in Journal of Animal Ecology (2014)
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276by Ausilio, Giorgia, Sand, Håkan, Månsson, Johan, Mathisen, Karen Marie, Wikenros, CamillaGet access
Published 2021
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277by Zimmermann, Barbara, Sand, Håkan, Wabakken, Petter, Liberg, Olof, Andreassen, Harry PeterGet access
Published in Journal of Animal Ecology (2015)
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278by Månsson, Johan, Marie-Caroline Prima, Nicholson, Kerry, Wikenros, Camilla, Sand, HåkanGet access
Published 2017
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279by Månsson, Johan, Marie-Caroline Prima, Nicholson, Kerry, Wikenros, Camilla, Sand, HåkanGet access
Published 2017
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280Data from: Predator-dependent functional response in wolves: from food limitation to surplus killingby Zimmermann, Barbara, Sand, Håkan, Wabakken, Petter, Liberg, Olof, Andreassen, Harry PetterGet access
Published 2014
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