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Sand is an example of a class of materials called granular matter. Sand is a naturally occurring, finely divided rock, comprising particles or granules ranging in size from 0.063 to 2 mm. An individual particle in this range size is termed a sand grain. The next smaller size class in geology is silt: particles below 0.063 mm down to 0.004 mm in size. The next larger size class above sand is gravel, with particles ranging up to 64 mm (see grain size for standards in use).
The most common constituent of sand in inland continental settings and non- tropical coastal settings, is silica (silicon dioxide), often in the form of quartz. However, the composition of sand varies according to local rock sources and conditions. Much of the fine white sand found in coral reef settings, for example, is ground-up coral ( limestone) that has passed through the digestion of the parrot fish. Some locations have sands that contain iron, feldspar, or even gypsum.
Sand is transported by windFor the 1928 film, see The Wind. Wind in the most general sense, is the movement of air. It occurs at all scales, from local breezes generated by heating of land surfaces and lasting tens of minutes to global winds resulting from solar heating of the plan or waterDrinking water This article focuses on water as we experience it every day. The water (molecule) article describes water from a scientific and technical perspective. Water is an abundant substance on Earth. It exists in many forms, such as sea, rain, and and deposited in the form of beachA beach or strand is a geological formation consisting of loose rock particles such as sand, shingle, or cobble along the shoreline of a body of water. Components Some geologists consider a beach to be just this shoreline feature of deposited material, bues, duneAlternate meanings: Dune (novel), Dune (movie), Dune (TV miniseries), Dune (music) or Dune (computer game In physical geography, a dune is a hill of sand built by eolian ( wind-related) processes. Bare dunes are subject to shifting location and size baseds, sand spitsIn geography, a bar is a linear shoaling landform feature within a body of water. Bars tend to be long and narrow (linear) and develop where a current (or waves) promote deposition of particles, resulting in localized shallowing (shoaling) of the water., sand barsIn geography, a bar is a linear shoaling landform feature within a body of water. Bars tend to be long and narrow (linear) and develop where a current (or waves) promote deposition of particles, resulting in localized shallowing (shoaling) of the water., and the like. In a desertEgyptian desert In geography, a desert is a landscape form or region that receives little precipitation. As a consequence, deserts have a reputation for supporting very little life. Compared to wetter regions this may be true, although upon closer examina, sand is a dominant soil type.
Sand is often a principal component of the aggregate used in the preparation of concreteIn general, a concept is considered concrete if it is not abstract: it must be both particular and an individual, and hence occupy both space and time. To say that a physical object is concrete is to say, approximately, that it is a particular individual. Sand manufactured at rock crusher plants for use as an aggregate is called mansand. Graded sand is used as an abrasiveAn abrasive is a usually rough object that is used to smooth another through extensive rubbing. Examples carborundum diamond dust emery (mineral) (impure corundum) grinding wheel powdered glass pumice dust sand sandpaper Manufacturing. in sandblasting and is also used in media filters for filtering water.
Sandy soils are ideal for certain crops such as watermelons and peanuts and are often preferred for intensive dairy farming because of their excellent drainage characteristics.
Sand bags are used for protection against floods and gun fire. They can be easily transported when empty, and filled with local sand.
People, especially children, love to play with sand on a beach or in a sandbox. See sand art and play for details.
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