Sand is a naturally occurring granular material composed of finely divided rock and mineral particles. It is defined by size, being finer than gravel and coarser than silt. Sand can also refer to a textural class of soil or soil type; i.e., a soil containing more than 85 percent sand-sized particles by mass.
The composition of sand varies, depending on the local rock sources and conditions, but the most common constituent of sand in inland continental settings and non-tropical coastal settings is silica (silicon dioxide, or SiO2), usually in the form of quartz. The second most common type of sand is calcium carbonate, for example, aragonite, which has mostly been created, over the past half billion years, by various forms of life, like coral and shellfish. For example, it is the primary form of sand apparent in areas where reefs have dominated the ecosystem for millions of years like the Caribbean.
Sand is a non-renewable resource over human timescales, and sand suitable for making concrete is in high demand.
A verbal operant in which the response is reinforced by a characteristic consequence and is therefore under the functional control of relevant conditions of deprivation or aversive stimulation.
To produce a mand (verbal operant).
Rock that is grain sizes chart), forming beaches and deserts and also used in construction.
A beach or other expanse of sand.
“The Canadian tar sands are a promising source of oil.”
A particle from 62.5 microns to 2 mm in diameter, following the Wentworth scale.
A light beige colour, like that of typical sand.
A single grain of sand.
A moment or interval of time; the term or extent of one’s life (referring to the sand in an hourglass).
Of a light beige colour, like that of typical sand.
To abrade the surface of (something) with sand or sandpaper in order to smooth or clean it.
To cover with sand.
To blot ink using sand.