Sand

Sand is a mixture of very small pieces of different rocks or minerals. It is the same minerals from which those pieces are broken, such as granite and feldspar. Sand is gritty to touch. It is a naturally occurring granular material composed of finely divided rock and mineral particles. Sand is also formed various rocks by weathering and erosion. Erosion breaks large boulders into smaller rocks. They get smaller and smaller until they reach the beach or a low-lying area as sand.

Sand grains are smaller than gravel grains, (from  to ), and larger than silt, (around  to ).  Sand is mostly found on beaches, and in deserts. The most common types of sand are made of silica, or silicon dioxide (SiO2). Calcium carbonate (CaCO3) is the second most common. Sand dunes are made when wind or a river pulls sand into a mountain-like shape. They can be found in deserts, but sometimes high up on beaches too.

Applications
Sand is crucial in the process of mixing concrete. It can also be used to make sand castles. Sand is sometimes used in households for aesthetic purposes.

Related pages
 Earth
 Geology
 Physical chemistry
 Inorganic chemistry
 Environmental chemistry

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