Gravel is rock that is of a certain grain size range. In geology, gravel is any loose rock that is at least two millimeters in its largest dimension (about 1/12 of an inch), and no more than 75 millimeters (about 3 inches). Sometimes gravel is restricted to rock in the 2-4 millimeter range, with pebble being reserved for rock 4-75 millimeters (some say 64 millimeters). The next smaller size class in geology is sand, which is 0.02 mm to 2 mm in size. The next larger size is cobble, which is 75 (64) milli ...

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Gravel - Types of gravel

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Granularity - In physics Granularity - In computing Granularity - In credit portfolio risk management

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In parallel computing, granularity means the amount of computation in relation to communication, i.e., the ratio of computation to the amount of communication. "Fine-grain parallelism" means individual tasks are relatively small in terms of code size and execution time, "coarse grain" is the opposite. The smaller the granularity, the greater the potential for parallelism and hence speed-up but the greater the overheads of synchronisation and communication. (The ...

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Granularity, Granularity - In physics, Granularity - In computing, Granularity - In credit portfolio risk management

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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 1⁄16 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 below 1⁄16 mm down to 1⁄256 mm (0.004 mm) in size. The next larger size class above sand is gravel, with particles ranging up to 6 ...

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Sand - Uses of sand Sand - Hazards of sand

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Clay is a generic term for an aggregate of hydrous silicate particles less than 4 μm (micrometres) in diameter. Clay consists of a variety of phyllosilicate minerals rich in silicon and aluminium oxides and hydroxides which include variable amounts of structural water. Clays are generally formed by the chemical weathering of silicate-bearing rocks by carbonic acid, but some are formed by hydrothermal activity. Clays are distinguished from other small parti ...

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Clay - Historical and modern uses of clay

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Clays are heavy in texture yet soft to the touch. Clay is a malleable substance when wet, which means it can be shaped easily with the hands. When dry, it becomes firm and when "fired," or hardened by intense heat, clay becomes permanently solid. A fireplace specifically designed for hardening clay is called a kiln. These properties make clay an ideal subtance for making pottery, stoneware and various other practical items. Early humans discovered the useful properties of clay in prehistoric times, and one of the earliest artifacts ever unco ...

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Clay, Clay - Historical and modern uses of clay

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Cobble is a geologic term for a rock or rock fragment with a grain size with dimensions between 64–256 mm (2.5–10 inch). Rounded cobble sized rocks are used as a construction material for road and street surfacing: see cobblestone. A cobble is also a shallow bottomed, low draught fishing boat. A coble is also a familiar term for the Hawfinch. ...

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In geology, a boulder is any grain size rock of a larger than 256 mm (10 in) in diameter (see grain size for standards in use). While a boulder may be small enough to move or roll manually, others are extremely massive. Some famous rock formations involve giant boulders exposed by erosion, such as the Devil's Marbles in Australia's Northern Territory. In common usage, the term boulder is most often used to refer to large boulders, especially those too large for a person to move. Smaller bou ...

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Sediment - Rivers and streams. If a fluid, such as water, is flowing, it can carry suspended particles. The settling velocity is the minimum velocity a flow must have in order to transport, rather than deposit, sediments, and (for a dilute suspension) is given by Stoke's Law: where w is the settling velocity, ρ is density (the subscripts p and f indicate particle and fluid respectively), g is the acceleration due to gravity, r is the radius of the particle and < ...

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Sediment, Sediment - Sediment transport, Sediment - Rivers and streams, Sediment - Shores and shallow seas

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Most meteorites are full of millimeter-sized silicate spherules which are called chondrules (from Greek chondros, grain), suspended in a fine-grained matrix which includes cosmic dust grains and chondrule fragments. Meteorites which contain chondrules are called chondrites or chondritic meteorites. They can consist of up to 80% chondrules. Chondrites represent the oldest solid material within our solar system and are believed to be the building blocks of the planetary system. Hence, from the abundance of chondrule ...

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Chondrule - Formation Chondrule - Organic compounds in chondrites

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Cosmic dust - Introductory Material. Cosmic Dust refers to particles in space which are assemblages of a few molecules to tenth-millimeter-sized grains. Cosmic dust can be further distinguished by its astronomical location; for example: interplanetary dust, interstellar dust, comet dust, circumplanetary dust. This article covers bulk and radiative properties of cosmic dust, the dust particles' origins, end-fates, and specific locations in space. Historically, cosmic dust used to be an annoyanc ...

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Cosmic dust - Introductory Material Cosmic dust - Some bulk properties of cosmic dust Cosmic dust - Radiative properties of cosmic dust Cosmic dust - Dust grain formation Cosmic dust - Dust grain destruction Cosmic dust - Some dusty clouds in the universe

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This entry incorporates text from the public domain Easton's Bible Dictionary, originally published in 1897. Abib, also spelled Aviv, has three meanings in Hebrew: The stage in the growth of grain when the seeds have reached full size and are filling with starch, but have not dried yet. During the plague of hail (Exodus 9:31), the barley was abib and the flax was giv`ol. The month in the Hebrew calendar when the barley has reached or passed this stage (Ex. 13:4; 23:15); the seve

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Sandstone is a sedimentary rock composed mainly of sand-size mineral or rock grains. Most sandstone is comprised of quartz and/or feldspar because these are the most common minerals in earth's crust. Like sand, sandstone may be any color, but the most common colors are tan, brown, yellow, red, gray, and white. Since sandstone beds often form highly visible cliffs and other topographic features, certain colors of sandstone may be strongly identified with certain regions. For instance, much of the North Ame ...

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Sandstone - Origins Sandstone - Types of sandstone Sandstone - Basic References

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An argillite is a fine-grained sedimentary rock composed predominately of indurated clay particles. Argillites are basically lithified muds and oozes. They contain variable amounts of silt sized particles. The argillites grade into shale when the fissile layering typical of shale is developed. Another name for poorly lithified argillites is mudstone. Thes rocks, although variable in composition, are typically high in aluminium and silica with variable alkali and alkaline earth cations. The term pelitic or pelite is often applied to these sediments and rocks. Metamorphism of argillit ...

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"Candy bar" is the most popular term in the U.S. for confectionery usually packaged in a bar or log form, often coated with chocolate, and sized as a snack for one person. But within that term, a wide variety of products exist, ranging from solid chocolate bars to multiple layerings or mixtures of ingredients such as nuts, fruit, grains in various forms, coconut, marzipan, marshmallow, caramel, nougat, toffee, fondant, and fudge. In British English and Canadian English the proper term chocolate bar is used. The word ca ...

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Candy bar - Brands Candy bar - Manufacturers

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The carat is a unit of mass used for gems, and equals 200 milligrams. The word derives from the Greek keration (fruit of the carob), via Arabic and Italian. Carob seeds were used as weights on precision scales because of their uniform size. In the distant past, different countries each had their own carat, roughly equivalent to a carob seed. Eventually, it was linked to the grain in the Troy pound system of measurement. Under this system the standard was about 205 milligrams. Metric countries used this measurement nonetheless in i ...

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VeriChip is an RFID identification product from VeriChip Corporation, a wholly owned subsidiary of Applied Digital Solutions, a Florida corporation. VeriChip - Overview. VeriChip is a subdermal RFID (Radio Frequency Identification Device) microchip implant that has uses in security, financial, emergency identification, and other applications. About the size of a grain of rice, each VeriChip product contains a unique identification number that is captured by passing a RFID reader over ...

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VeriChip - Overview VeriChip - Controversy

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Ebony (Diospyros ebenum), also known as Indian Ebony or Ceylon Ebony, is a tree in the genus Diospyros, native to southern India and Sri Lanka. It is noted for its heavy, black, fine-grained heartwood. It is a medium-sized evergreen tree, reaching 20-25 m tall. The leaves are entire, about 6-15 cm long and 3-5 cm broad. The fruit is a small berry 2 cm diameter, similar to a small persimmon ...

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Ebony - Uses

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A crystallite is a domain of solid-state matter that has the same structure as a single crystal. Solid objects that are large enough to see and handle are rarely composed of a single crystal, except for a few cases (gems, silicon single crystals for the electronics industry, certain types of fiber, and single crystals of a nickel-based superalloy for turbojet engines). Most materials are polycrystalline; they are made of a large number of single crystals—crystallites—held together by thin layers of amorphous solid. The crystallite size can ...

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Crystallite - Grain boundaries

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See text. The mosquito is a member of the family Culicidae; these insects have a pair of scaled wings, a pair of halteres, a slender body, and long legs. The females of most mosquito species suck blood from other animals. Size varies but is rarely greater than 15 mm (0.6 inch). Mosquitoes weigh only about 2 to 2.5 mg (0.03 to 0.04 grain). They can fly at about 1.5 to 2.5 km/h ( ...

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Mosquito - Natural history Mosquito - Mosquitoes and health Mosquito - Mosquito control and integrated mosquito management Mosquito - Mosquito repellants and personal mosquito control

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