Dictionary:

sand

  (sănd)

1. 1. Small loose grains of worn or disintegrated rock.
   2. Geology. A sedimentary material, finer than a granule and coarser than silt, with grains between 0.06 and 2.0 millimeters in diameter.
2. A tract of land covered with sand, as a beach or desert. Often used in the plural.
3. 1. The loose, granular, gritty particles in an hourglass.
   2. sands Moments of allotted time or duration: “The sands are numb'red that makes up my life” (Shakespeare).
4. Slang. Courage; stamina; perseverance: “She had more sand in her than any girl I ever see; in my opinion she was just full of sand” (Mark Twain).
5. A light grayish brown to yellowish gray.

1. To sprinkle or cover with or as if with sand.
2. To polish or scrape with sand or sandpaper.
3. To mix with sand.
4. To fill up (a harbor) with sand.

[Middle English, from Old English.]

Background

Sand is a loose, fragmented, naturally-occurring material consisting of very small particles of decomposed rocks, corals, or shells. Sand is used to provide bulk, strength, and other properties to construction materials like asphalt and concrete. It is also used as a decorative material in landscaping. Specific types of sand are used in the manufacture of glass and as a molding material for metal casting. Other sand is used as an abrasive in sandblasting and to make sandpaper.

Sand was used as early as 6000 B.C. to grind and polish stones to make sharpened tools and other objects. The stones were rubbed on a piece of wetted sandstone to hone the cutting edge. In some cases, loose sand was scattered on a flat rock, and objects were rubbed against the sandy surface to smooth them. The first beads with a glass glaze appeared in Egypt in about 3,500-3,000 B.C. The glass was made by melting sand, although naturally-occurring glass formed by volcanic activity was probably known long before that time.

In the United States, sand was used to produce glass as early as 1607 with the founding of the short-lived Jamestown colony in Virginia. The first sustained glass-making venture was formed in 1739 in Wistarburgh, New Jersey, by Caspar Wistar. The production of sand for construction purposes grew significantly with the push for paved roads during World War I and through the 1920s. The housing boom of the late 1940s and early 1950s, coupled with the increased use of concrete for building construction, provided another boost in production.

Today, the processing of sand is a multi-billion dollar business with operations ranging from very small plants supplying sand and gravel to a few local building contractors to very large, highly automated plants supplying hundreds of truckloads of sand per day to a wide variety of customers over a large area.

Raw Materials

The most common sand is composed of particles of quartz and feldspar. Quartz sand particles are colorless or slightly pink, while feldspar sand has a pink or amber color. Black sands, such as those found in Hawaii, are composed of particles of obsidian formed by volcanic activity. Other black sands include materials such as magnetite and homblende. Coral sands are white or gray, and sands composed of broken shell fragments are usually light brown. The white sands on the Gulf of Mexico are made of smooth particles of limestone known as oolite, derived from the Greek word meaning egg stone. The white sands of White Sands, New Mexico, are made of gypsum crystals. Ordinarily, gypsum is dissolved by rain water, but the area around White Sands is so arid that the crystals survive to form undulating dunes.

Quartz sands, which are high in silica content, are used to make glass. When quartz sands are crushed they produce particles with sharp, angular edges that are sometimes used to make sandpaper for smoothing wood. Some quartz sand is found in the form of sandstone. Sandstone is a sedimentary, rock-like material formed under pressure and composed of sand particles held together by a cementing material such as calcium carbonate. A few sandstones are composed of almost pure quartz particles and are the source of the silicon used to make semiconductor silicon chips for microprocessors.

Molding sands, or foundry sands, are used for metal casting. They are composed of about 80%-92% silica, up to 15% alumina, and2% iron oxide. The alumina content gives the molding sand the proper binding properties required to hold the shape of the mold cavity.

Sand that is scooped up from the bank of a river and is not washed or sorted in any way is known as bank-run sand. It is used in general construction and landscaping.

The definition of the size of sand particles varies, but in general sand contains particles measuring about 0.0025-0.08 in (0.063-2.0 mm) in diameter. Particles smaller than this are classified as silt. Larger particles are either granules or gravel, depending on their size. In the construction business, all aggregate materials with particles smaller than 0.25 in (6.4 mm) are classified as fine aggregates. This includes sand. Materials with particles from 0.25 in (6.4 mm) up to about 6.0 in (15.2 cm) are classified as coarse aggregates.

Sand has a density of 2,600-3,100 lb per cubic yard (1,538-1,842 kg per cubic meter). The trapped water content between the sand particles can cause the density to vary substantially.

The Manufacturing
Process

The preparation of sand consists of five basic processes: natural decomposition, extraction, sorting, washing, and in some cases crushing. The first process, natural decomposition, usually takes millions of years. The other processes take considerably less time.

The processing plant is located in the immediate vicinity of the natural deposit of material to minimize the costs of transportation. If the plant is located next to a sand dune or beach, the plant may process only sand. If it is located next to a riverbed, it will usually process both sand and gravel because the two materials are often intermixed. Most plants are stationary and may operate in the same location for decades. Some plants are mobile and can be broken into separate components to be towed to the quarry site. Mobile plants are used for remote construction projects, where there are not any stationary plants nearby.

The capacity of the processing plant is measured in tons per hour output of finished product. Stationary plants can produce several thousand tons per hour. Mobile plants are smaller and their output is usually in the range of 50-500 tons (50.8-508 metric tons) per hour.

In many locations, an asphalt production plant or a ready mixed concrete plant operates on the same site as the sand and gravel plant. In those cases, much of the sand and gravel output is conveyed directly into stockpiles for the asphalt and concrete plants.

The following steps are commonly used to process sand and gravel for construction purposes.

Natural decomposition

• Solid rock is broken down into chunks by natural mechanical forces such as the movement of glaciers, the expansion of water in cracks during freezing, and the impacts of rocks falling on each other.
• The chunks of rock are further broken down into grains by the chemical action of vegetation and rain combined with mechanical impacts as the progressively smaller particles are carried and worn by wind and water.
• As the grains of rock are carried into waterways, some are deposited along the bank, while others eventually reach the sea, where they may join with fragments of coral or shells to form beaches. Wind-borne sand may form dunes.

Extraction

• Extraction of sand can be as simple as scooping it up from the riverbank with a rubber-tired vehicle called a front loader. Some sand is excavated from under water using floating dredges. These dredges have a long boom with a rotating cutter head to loosen the sand deposits and a suction pipe to suck up the sand.
• If the sand is extracted with a front loader, it is then dumped into a truck or train, or placed onto a conveyor belt for transportation to the nearby processing plant. If the sand is extracted from underwater with a dredge, the slurry of sand and water is pumped through a pipeline to the plant.

Sorting

• In the processing plant, the incoming material is first mixed with water, if it is not already mixed as part of a slurry, and is discharged through a large perforated screen in the feeder to separate out rocks, lumps of clay, sticks, and other foreign material. If the material is heavily bound together with clay or soil, it may then pass through a blade mill which breaks it up into smaller chunks.
• The material then pass through several / perforated screens or plates with different hole diameters or openings to separate the particles according to size. The screens or plates measure up to 10 ft (3.1 m) wide by up to 28 ft (8.5 m) long and are tilted at an angle of about 20-45 degrees from the horizontal. They are vibrated to allow the trapped material on each level to work its way off the end of the screen and onto separate conveyor belts. The coarsest screen, with the largest holes, is on top, and the screens underneath have progressively smaller holes.

Washing

• The material that comes off the coarsest screen is washed in a log washer before it is further screened. The name for this piece of equipment comes from the early practice of putting short lengths of wood logs inside a rotating drum filled with sand and gravel to add to the scrubbing action. A modern log washer consists of a slightly inclined horizontal trough with slowly rotating blades attached to a shaft that runs down the axis of the trough. The blades churn through the material as it passes through the trough to strip away any remaining clay or soft soil. The larger gravel particles are separated out and screened into different sizes, while any smaller sand particles that had been attached to the gravel may be carried back and added to the flow of incoming material.
• The material that comes off the intermediate screen(s) may be stored and blended with either the coarser gravel or the finer sand to make various aggregate mixes.
• The water and material that pass through the finest screen is pumped into a horizontal sand classifying tank. As the mixture flows from one end of the tank to the other, the sand sinks to the bottom where it is trapped in a series of bins. The larger, heavier sand particles drop out first, followed by the progressively smaller sand particles, while the lighter silt particles are carried off in the flow of water. The water and silt are then pumped out of the classifying tank and through a clarifier where the silt settles to the bottom and is removed. The clear water is recirculated to the feeder to be used again.
• The sand is removed from the bins in the bottom of the classifying tank with rotating dewatering screws that slowly move the sand up the inside of an inclined cylinder. The differently sized sands are then washed again to remove any remaining silt and are transported by conveyor belts to stockpiles for storage.

Crushing

• Some sand is crushed to produce a specific size or shape that is not available naturally. The crusher may be a rotating cone type in which the sand falls between an upper rotating cone and a lower fixed cone that are separated by a very small distance. Any particles larger than this separation distance are crushed between the heavy metal cones, and the resulting particles fall out the bottom.

Quality Control

Most large aggregate processing plants use a computer to control the flow of materials. The feed rate of incoming material, the vibration rate of the sorting screens, and the flow rate of the water through the sand classifying tank all determine the proportions of the finished products and must be monitored and controlled. Many specifications for asphalt and concrete mixes require a certain distribution of aggregate sizes and shapes, and the aggregate producer must ensure that the sand and gravel meets those specifications.

The Future

The production of sand and gravel in many areas has come under increasingly stringent restrictions. The United States Army Corps of Engineers, operating under the Federal Clean Water Act, has required permits for sand extraction from rivers, streams, and other waterways. The cost of the special studies required to obtain these permits is often too expensive to allow smaller companies to continue operation. In other cases, residential development in the vicinity of existing aggregate processing plants has led to restrictions regarding noise, dust, and truck traffic. The overall result of these restrictions in certain areas is that sand and gravel used for construction will have to be transported from outside the area at a significantly increased cost in the future.

Where to Learn More

Books

Brady, George S. and Henry R. Clauser. Materials Handbook, 12th Edition. McGraw-Hill, 1986.

Hornbostel, Caleb. Construction Materials, 2nd Edition. John Wiley and Sons, Inc., 1991.

Siever, Raymond. Sand. W.H. Freeman and Company, 1988.

Periodicals

Grover, Jennifer E., Bob Drake, and Steven Prokopy. "100 Years of Rock Products, History of an Industry: 1896-1996." Rock Products, July 1996, pp. 29+.

Mack, Walter N. and Elizabeth A. Leistikow. "Sands of the World." Scientific American, August 1996, pp. 62-67.

Miller, Russell V. "Changes in Construction Aggregate Availability in Major Urban Areas of California Between the Early 1980s and the Early 1990s." California Geology, January/February 1997, pp. 3-17.

[Article by: Chris Cavette]

Unconsolidated granular material consisting of mineral, rock, or biological fragments between 63 micrometers and 2 mm in diameter. Finer material is referred to as silt and clay; coarser material is known as gravel. Sand is usually produced primarily by the chemical or mechanical breakdown of older source rocks, but may also be formed by the direct chemical precipitation of mineral grains or by biological processes. Accumulations of sand result from hydrodynamic sorting of sediment during transport and deposition. See also Clay minerals; Depositional systems and environments; Gravel; Mineral; Rock; Sedimentary rocks.

Most sand originates from the chemical and mechanical breakdown, or weathering, of bedrock. Since chemical weathering is most efficient in soils, most sand grains originate within soils. Rocks may also be broken into sand-size fragments by mechanical processes, including diurnal temperature changes, freeze-thaw cycles, wedging by salt crystals or plant roots, and ice gouging beneath glaciers. See also Weathering processes.

Because sand is largely a residual product left behind by incomplete chemical and mechanical weathering, it is usually enriched in minerals that are resistant to these processes. Quartz not only is extremely resistant to chemical and mechanical weathering but is also one of the most abundant minerals in the Earth's crust. Many sands dominantly consist of quartz. Other common constituents include feldspar, and fragments of igneous or metamorphic rock. Direct chemical precipitation or hydrodynamic processes can result in sand that consists almost entirely of calcite, glauconite, or dense dark-colored minerals such as magnetite and ilmenite. See also Feldspar; Quartz.

Although sand and gravel has one of the lowest average per ton values of all mineral commodities, the vast demand makes it among the most economically important of all mineral resources. Sand and gravel is used primarily for construction purposes, mostly as concrete aggregate. Pure quartz sand is used in the production of glass, and some sand is enriched in rare commodities such as ilmenite (a source of titanium) and in gold. See also Concrete.

geology A particle size, of maximum diameter 2 mm (0.787~ in), ranging to about a sixth of that depending on the scheme employed.

Particles of rock with diameters ranging from 0.06 mm to 2.00 mm. Most sands are formed of the mineral, quartz. Sandy soils are loose, non-plastic, and permeable, and have little capacity to hold water.

For more information on sand, visit Britannica.com.

A custom reported in several locations but surviving only at Knutsford, Cheshire, is the decoration of pavements with coloured sand on special occasions such as May Day and for local weddings. At Knutsford, the sand is dispensed through a funnel, and it is said that it is better when it rains because the colour thus lives on for a while in the paving stones. Henderson (1879: 40-1) also mentions sand strewing for weddings in 19th-century Newcastle.

Bibliography
The full bibliography list is available here.

• Shuel, 1985: 34
• D. Haworth and W. M. Comber, Cheshire Village Memories (1961), plate 23
• Roy Kerridge, Bizarre Britain (1985), 60-3

1. Granular material which passes through a 9.51-μ (⅜-in.) sieve, almost entirely passes through a 4.76-mm (No. 4) sieve, and is predominantly retained on a 74-μ (No. 200) sieve; results from natural disintegration and abrasion of rock or processing of completely friable sandstone.
2. That portion of an aggregate passing through a 4.76-mm (No. 4) sieve and predominantly retained on a 74-μ (No. 200) sieve. Also see sieve number.

sanctus bell

1. material occurring in fine, gritty particles loose in the body.
2. geological sand is ingested by animals, especially horses, grazing on very sandy soil. The animals may take in large amounts and this accumulates in the large sacs of the alimentary tract, the reticulum of the cow and the cecum and colon in horses. Sand or dust storms, or volcanic dust fallout may produce a similar, acute situation.

• s. colic — see sand colic.
• s. enteritis — acute sand ingestion may cause enteritis with severe, sometimes fatal diarrhea. See also enteritis.
• s. flea — see tunga penetrans.
• s. rash — irritation and weeping of the toe webbing in racing Greyhounds causing lameness. Caused usually by racing in sand.
• s. shin oak — quercus havardii.
• s. toe — Greyhounds racing in sand suffer impaction of sand under the coronary band, causing lameness, mostly in the inner and outer toes of the hind paws.
• uterine s. — see uterine sand.

The worn grains of rock, the largest of the three minerals that form the basis of soil. The other two are silt and clay.

Close-up of sand from a beach in Vancouver, showing a surface area of (approximately) between 1-2 square centimetres.

Sand is a granular material made up of fine mineral particles. It is a naturally occurring, finely divided rock.

Sand comprises particles, or granules, ranging in diameter from 0.0625 (or ¹⁄₁₆ mm) to 2 millimeters. An individual particle in this range size is termed a sand grain. The next smaller size class in geology is silt: particles smaller than 0.0625 mm down to 0.004 mm in diameter. The next larger size class above sand is gravel, with particles ranging from 2 mm up to 64 mm (see particle size for standards in use). Sand feels gritty when rubbed between the fingers (silt, by comparison, feels like flour). Sand is commonly divided into five sub-categories based on size: very fine sand (1/16 - 1/8 mm diameter), fine sand (1/8 mm - 1/4 mm), medium sand (1/4 mm - 1/2 mm), coarse sand (1/2 mm - 1 mm), and very coarse sand (1 mm - 2 mm). These sizes are based on the Φ sediment size scale, where size in Φ = -log base 2 of size in mm. On this scale, for sand the value of Φ varies from -1 to +4, with the divisions between sub-categories at whole numbers.

Constituents of sand

An electron micrograph showing grains of sand

Close up of black volcanic sand from Perissa, in Santorini, Greece

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, which, because of its chemical inertness and considerable hardness, is resistant to weathering.

The composition of sand is highly variable, depending on the local rock sources and conditions. The bright white sands found in tropical and subtropical coastal settings are eroded limestone and may contain coral and shell fragments in addition to other organic or organically derived fragmental material.^[1] The gypsum sand dunes of the White Sands National Monument in New Mexico are famous for their bright, white color. Arkose is a sand or sandstone with considerable feldspar content, derived from the weathering and erosion of a (usually nearby) granite. Some sands contain magnetite, chlorite, glauconite or gypsum. Sands rich in magnetite are dark to black in color, as are sands derived from volcanic basalts and obsidian. Chlorite-glauconite bearing sands are typically green in color, as are sands derived from basalt (lava) with a high olivine content. Many sands, especially those found extensively in Southern Europe, have iron impurities within the quartz crystals of the sand, giving a deep yellow colour. Sand deposits in some areas contain garnets and other resistant minerals, including some small gemstones.

Sand is transported by wind and water and deposited in the form of beaches, dunes, sand spits, sand bars and related features.

Study of sand

Study of individual grains can reveal much historical information as to the origin and kind of transport of the grain. Quartz sand that is recently weathered from granite or gneiss quartz crystals will be angular. It is called sharp sand in the building trade where it is preferred for concrete, and in gardening where it is used as a soil amendment to loosen clay soils. Sand that is transported long distances by water or wind will be rounded, with characteristic abrasion patterns on the grain surface. Desert sand is typically rounded.

People who collect sand as a hobby are known as arenophiles or psammofiles.

Uses of sand

At 300 km/h, an ICE 3 (DB class 403) releases sand from several bogies to the rails.

Sand sorting tower at a gravel extraction pit.

• Sand is often a principal component of concrete.
• Molding sand, also known as foundry sand, is moistened or oiled and then shaped into molds for sand casting. This type of sand must be able to withstand high temperatures and pressure, allow gases to escape, have a uniform, small grain size and be non-reactive with metals.
• It is the principal component in glass manufacturing.
• Graded sand is used as an abrasive in sandblasting and is also used in media filters for filtering water.
• Brick manufacturing plants use sand as an additive with a mixture of clay and other materials for manufacturing bricks.
• Sand is sometimes mixed with paint to create a textured finish for walls and ceilings or a non-slip floor surface.
• Sandy soils are ideal for certain crops such as watermelons, peaches, and peanuts and are often preferred for intensive dairy farming because of their excellent drainage characteristics.
• Sand is used in landscaping, it is added to make small hills and slopes (for example, constructing golf courses).
• Beach nourishment - transportation to popular beaches where seasonal tides or artificial changes to the shoreline cause the original sand to flow out to sea.^[2]
• Sandbags are used for protection against floods and gun fire. They can be easily transported when empty, then filled with local sand.
• Sand castle building is a popular activity. There are competitive sand castle building competitions (See sand art and play).
• Sand animation is a type of performance art and a technique for creating animated films.
• Aquaria are often lined with sand instead of gravel. This is a low cost alternative which some believe is better than gravel.
• Railroads use sand to improve the traction of wheels on the rails.

Hazards

A stingray about to bury itself in sand

Sandstorm in Iraq.

While sand is generally harmless, one must take care with some activities involving sand such as sandblasting. Bags of silica sand used for sandblasting now carry labels warning the user to wear respiratory protection and avoid breathing the fine silica dust. There have been a number of lawsuits in recent years where workers have developed silicosis, a lung disease caused by inhalation of fine silica particles over long periods of time. Material safety data sheets (MSDS) for silica sand state that "excessive inhalation of crystalline silica is a serious health concern".[1]

In areas of high pore water pressure sand can partially liquefy to form quicksand. Quicksand, once dried, produces a considerable barrier to escape for creatures caught within, who often die from exposure as a result.

See also

Wikimedia Commons has media related to:

Sand

• Dry quicksand
• Particle size
• Quicksand
• Sandstone
• Sandstorm
• sand island
• Singing sand
• White Sands National Monument

References

1. ^ http://www.susanscott.net/Oceanwatch2002/mar1-02.html
2. ^ http://www.npr.org/templates/story/story.php?storyId=12026379

External links

• Beach Sand: What It Is, Where It Comes From and How It Gets Here-- Beaufort County Library

Topics in geotechnical engineering
Soils	Clay · Silt · Sand · Gravel · Peat
Soil properties	Hydraulic conductivity · Water content · Void ratio · Bulk density · Thixotropy · Reynolds' dilatancy · Angle of repose · Cohesion · Porosity · Permeability · Specific storage
Soil mechanics	Effective stress · Pore water pressure · Shear strength · Overburden pressure · Consolidation · Soil compaction · Soil classification · Shear wave
Geotechnical investigation	Cone penetration test · Standard penetration test · Exploration geophysics · Monitoring well · Borehole
Laboratory tests	Atterberg limits · California bearing ratio · Direct shear test · Hydrometer · Proctor compaction test · R-value · Sieve analysis · Triaxial shear test · Hydraulic conductivity tests · Water content tests
Foundations	Bearing capacity · Shallow foundation · Deep foundation · Dynamic load testing · Wave equation analysis · Crosshole sonic logging
Retaining walls	Lateral earth pressure · Mechanically stabilized earth · Soil nailing · Tieback · Gabion · Slurry wall
Slope stability	Mass wasting · Landslide
Earthquakes	Soil liquefaction · Response spectrum · Seismic hazard · Ground-structure interaction
Geosynthetics	Geotextile · Geomembranes · Geosynthetic clay liner

zh-yue:沙 bat-smg:Smėltės

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Dansk (Danish)
n. - sand, (sl) mod
v. tr. - strø sand på, slibe, skure, løbe på en sandbanke

idioms:

• sand bar    revle
• sand down    slibe med sandpapir
• sand trap    bunker
• shifting sands    flyvesand
• the sands are running out    det lakker mod enden

Nederlands (Dutch)
zand, schuren, met zand bestrooien

Français (French)
n. - sable, (US) cran (fam), courage
v. tr. - poncer, frotter/passer (qch) au papier de verre, sabler

idioms:

• sand bar    barre
• sand down    poncer, frotter/passer (qch) au papier de verre, sabler
• sand trap    (US, Sport) bunker, obstacle de sable
• shifting sands    sables mouvants
• the sands are running out    les jours sont comptés

Deutsch (German)
n. - Sand, Sandstrand
v. - streuen, abschmirgeln

idioms:

• sand bar    Sandbank
• sand down    abschmirgeln
• sand trap    (Golf) Bunker
• shifting sands    Flugsand
• the sands are running out    die Zeit läuft ab

Ελληνική (Greek)
n. - άμμος, (ΗΠΑ, καθομ.) κουράγιο
v. - προσαμμώνω, τρίβω με γυαλόχαρτο, νοθεύω με άμμο

idioms:

• sand bar    (γεωγρ.) αμμοσύρτις, πάγκος
• sand down    τρίβω με γυαλόχαρτο
• sand trap    (γκολφ) αμμοπαγίδα
• shifting sands    κινούμενη άμμος
• the sands are running out    δεν μένει πολύς χρόνος

Italiano (Italian)
piallare, sabbia

idioms:

• sand bar    banco di sabbia
• sand down    passare alla carta vetrata
• sand trap    ostacolo di sabbia
• shifting sands    dune
• the sands are running out    siamo agli sgoccioli

Português (Portuguese)
n. - areia (f)
v. - arear

idioms:

• sand bar    banco de areia
• sand down    alisar madeira com lixa
• sand trap    areia movediça
• shifting sands    areia que muda de posição por ação de ventos/ondas
• the sands are running out    o tempo está esgotando

Русский (Russian)
песок, гравий, песчаный пляж, пески, пустыня, песок в песочных часах, время, дни жизни, выдержка, стойкость характера, песочный цвет

idioms:

• sand bar    наносный песчаный остров, перекат, отмель
• sand down    очищать с помощью наждачной бумаги
• sand trap    ямка с песком - препятствие на поле для игры в гольф
• shifting sands    зыбучий песок
• the sands are running out    время идет, срок истекает, смертный час близок, жизнь подходит к концу, дышит на ладан

Español (Spanish)
n. - arena, playa, arenal, arena o suelo petrolífero
v. tr. - lijar, enarenar, mezclar con arena, arena, arenar, cubrir de arena, polvorear con arena, hacer encallar en la arena

idioms:

• sand bar    banco de arena
• sand down    lijar
• sand trap    hoyo de arena (golf)
• shifting sands    arena movediza
• the sands are running out    el tiempo (prefijado) se está acabando

Svenska (Swedish)
n. - sand, grus, mod (sl)
v. - sanda, blanda med sand

中文（简体） (Chinese (Simplified))
沙, 沙滩, 沙子, 撒沙于, 用沙擦, 撒沙似地布满, 磨光

idioms:

• sand bar    河口沙洲, 拦门沙
• sand down    用沙或砂纸等擦净, 磨光
• sand trap    障碍沙坑
• shifting sands    时间的变化
• the sands are running out    期限将到

中文（繁體） (Chinese (Traditional))
n. - 沙, 沙灘, 沙子
v. tr. - 撒沙於, 用沙擦, 撒沙似地佈滿, 磨光

idioms:

• sand bar    河口沙洲, 攔門沙
• sand down    用沙或砂紙等擦凈, 磨光
• sand trap    障礙沙坑
• shifting sands    時間的變化
• the sands are running out    期限將到

한국어 (Korean)
n. - 모래, 용기, 설탕
v. tr. - ~에 모래를 뿌리다, 모래로 닦다, ~에 모래를 섞다

idioms:

• sand down    사포로 닦아 매끄럽게 하다
• the sands are running out    시간은 얼마 안 남았다

日本語 (Japanese)
n. - 砂, 砂地, 砂浜, 勇気, 時間, 寿命
v. - 砂で磨く, 砂を撒く

idioms:

• sand bar    サンドバー, 沿岸砂州
• sand down    砂で磨く
• sand trap    サンドトラップ

العربيه (Arabic)
‏(الاسم) رمل (فعل) يغطي أو يملأ بالرمل, ينظف أو يصقل بالرمل‏

עברית (Hebrew)
n. - ‮חול, חוף-הים, דבקות במטרה, כוח-סבל‬
v. tr. - ‮שפשף בחול, כיסה בחול‬

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