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Sand is a very useful substance and this is how it is made... When a solid rock is exposed to the action of the wind, rain and frost and broken into smaller particles, if the particles are small enough ( between 0.05 mm in diameter and 2.5 ...
http://www.blurtit.com/q172976.html
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But not all sand grains are made of quartz and feldspar. The brilliant snow-white dunes of White Sands, New Mexico are composed of gypsum, and the spectacular black sand beaches of tropical Pacific islands are made of fine volcanic particles.
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waynesword.palomar.edu/ww0704b.htm
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Most sands are usually made out of quartz grains (pure silica), but can contain things like fragments of shells, corals etc. Desert sands normally appear red in colour, due to oxidation and consequent red staining of the sand grains. Some s...
http://wiki.answers.com/Q/What_is_sand_is_made_out_of
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Each layer is made of a different material. The darker ones are layers of shale. Lighter bands are limestone. These are the ones that are important to our story because they contain gypsum. ... The sand at White Sands National Monument is almost pure gypsum. Gypsum is different from many other rocks because it is...
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www.nps.gov/whsa/factsheets.htm
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Sand is made of minerals and tiny pieces of rock that have come from the erosion and weathering of rocks. The composition of sand varies from place to place depending on the sources and conditions of the local rocks. The most common constit...
http://answers.yahoo.com/question/index?qid=20080903183...
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Sand particles range in diameter from 0.0625 mm to 2 mm. (Note: a millimeter (mm) is approximately as long as this dash:-.) Not all beaches are composed of fine sand grains. Some, called cobble beaches, are made up of rather large rocks.
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seagrant.gso.uri.edu/factsheets/sand.html
seagrant.gso.uri.edu/factsheets/sand.html
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The first beads with a glass glaze appeared in Egypt in about 3,500-3,000 B.C. The glass was made by melting sand, although naturally-occurring glass formed by volcanic activity was probably known long before that time.
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www.madehow.com/Volume-3/Sand.html
www.madehow.com/Volume-3/Sand.html
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The most common type of shoreline in the Great Lakes region is the sand beach. Sand is deposited on beaches when ... What is sand made of? Sand consists of rocks, crystals, and sea shells that are eroded over a long period of time by wind, water, and ice. The composition of sand can change greatly from beach to beach.
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www.great-lakes.net/teach/geog/shoreline/shore_2.html
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Third, can you identify the material that makes up the sand? Is it made from minerals like quartz, feldspar or mica or is it made from tiny bits of broken shells? ... As one might guess, the sand must be made from some material other than decomposed rock. After time, wave action will smooth out the sharp edges of the shells.
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www.microscope-microscope.org/applications/sand/microsc...
www.microscope-microscope.org/applications/sand/microscopic-sand.htm
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