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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281by Giorgia Ausilio, Håkan Sand, Johan Månsson, Karen Marie Mathisen, Camilla WikenrosGet access
Published in Frontiers in Ecology and Evolution (2021)
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283by Zimmermann, Barbara, Sand, Håkan, Wabakken, Petter, Liberg, Olof, Andreassen, Harry PetterGet access
Published 2014
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288by Zimmermann, Barbara, Sand, Håkan, Wabakken, Petter, Liberg, Olof, Andreassen, Harry PetterGet access
Published 2014
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294by Sand, Olav, Enger, Per S., Karlsen, Hans Erik, Knudsen, Frank, Kvernstuen, TorsteinGet access
Published 2000
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295by ZIMMERMANN, BARBARA, WABAKKEN, PETTER, SAND, HÅKAN, PEDERSEN, HANS C., LIBERG, OLOFGet access
Published in The Journal of Wildlife Management (2007)
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296by Sand, H., Wikenros, C., Ahlqvist, P., Strømseth, T.H., Wabakken, P.Get access
Published in Canadian Journal of Zoology (2012)
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297by Sand, H., Wikenros, C., Ahlqvist, P., Strømseth, T.H., Wabakken, P.Get access
Published in Canadian Journal of Zoology (2012)
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299by Ausilio, Giorgia, Sand, Håkan, Månsson, Johan, Mathisen, Karen Marie, Wikenros, CamillaGet access
Published in Frontiers in Ecology and Evolution (2021)
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