Sand is an abrasive material composed mainly of mineral and finely divided mineral particles. Sand has different compositions but generally is defined by its coarse grain structure. Sand grains are usually smaller than clay and finer than sand. It is used as an ingredient in construction materials, and in sports such as volleyball.
песок can be made from different sources. Sandstone, river sand, lake sand, granite, and offshore stones are among the most common materials used to make sand. Most naturally occurring sand contains fossils in association with quartz and feldspars. Although there is debate over the function of sandstone in both the prehistoric and modern periods, some scientists have provided evidence that suggests their use for enhancing soil fertility.
In addition to its role in soil fertility, sand can be used to enhance the look and texture of an outdoor area. Sand can be mixed with other materials to create interesting designs, or to simply provide a smooth surface. Because of its fine grain structure, sand particles will clump together when they come into contact with one another. Sand can be combined with gravel to create the effect of a sloping beach.
Sand serves as a common constituent in sandbags and other sand consumer products. Sandbags are designed to keep sand contained during transportation and easy to carry during storage. A sandbag has a closed cell structure that requires little or no maintenance except for the occasional wiping with a damp cloth. The common type of sand in these bags is made from sodium silicates, calcium sand, and calcium carbonate.
Another important characteristic of sand is its ability to absorb moisture, thus preventing the formation of mold on lawns and interior surfaces. Sand grains also define dunes and landing areas, which are important characteristics of deserts and landing areas in the sand. Sand grains have a flat, wide, wavy, grain structure that defines their shape and size. Sand grains may appear flat due to the lack of patterning on the structure, or the lack of fine grains, but they can still vary in size, shape, color, and structure depending on the type of sand being used and the type of sand being combined.
The composition of desert sand consists mostly of quartz grains, feldspar, and mica. The quartz grains are most commonly found in sand that is about half water content. The other two major components of sand are often iron or aluminum oxide, and sometimes tin. Iron or aluminum oxide grains can either be very coarse or very fine, depending on how they were manufactured. Micas are often found in wet granules of dust, which are another common component of desert sand.