The most common use of sand is in building materials. Sand is mixed with cement and water to make concrete. Sand is used in the manufacture of brick, glass and other materials, and it can also be used as a media for the filtration of water.
Sand is also found as a landscaping material, and as an amendment for soil to change its characteristics. Sand is used to make castings, and as an abrasive agent like blasting sand. Sand could be spread on icy roads to improve traction, and is the filler in sandbags. there are other uses for this ubiquitous material, and an investigator would not have to look far to discover more.