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 between the size of gravel grains (which is from 2 mm to 64 mm) and the size of silt (which is around 0.0625 mm to 0.004 mm). Most sand is found on beaches, and in deserts. The most common sands are made of silica (silicon dioxide, or SiO2). Calcium carbonate is the second more 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.
Sand is crucial in the process of mixing concrete. It can also be used to make sand castles. Sand is sometimes in households for aesthetic purposes.
Examples of Sand
-
Sand dune on a beach in Calabria. -
Other websites
Media related to Sand at Wiki Commons
This article uses material from the Wikipedia Simple English article Sand, which is released under the Creative Commons Attribution-ShareAlike 3.0 license ("CC BY-SA 3.0"); additional terms may apply (view authors). Content is available under CC BY-SA 4.0 unless otherwise noted. Images, videos and audio are available under their respective licenses.
®Wikipedia is a registered trademark of the Wiki Foundation, Inc. Wiki Simple English (DUHOCTRUNGQUOC.VN) is an independent company and has no affiliation with Wiki Foundation.