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                       Sand By Type and LocationSand is a large accumulation of small rock and/or mineral particles in the size
                    range of from 20 micrometers to 2,000
                    micrometers in diameter (0.020 to 2.0 millimeters). Sand may include small
                    shells or shell fragments and oolitic deposits. Sand is a size and
                    density segregated material that is the result of air or water
                    action.
 
    http://www.microscopy-uk.org.uk/mag/indexmag.html?http://www.microscopy-uk.org.uk/mag/artjun01/clsand.html (Good Information on the microscopy of sand, Great site for more
                    information on microscopy in general)
 
 http://www.scientificamerican.com/article.cfm?id=a-grain-of-sand-natures-secret-wonder
 (Good Information on Sand with links to more information on sand)
 
 http://www.sciencelive.org/component/option,com_mediadb/task,play/idstr,Open-feeds_fsc_exploring_sedimentary_processes_fsc02_02_m4v/vv,-2/Itemid,97
 (Brief, very informative video on what can be learned from the shape of a
                    sand grain.)
 
 
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