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Topic: Gravel

	Gravel - Wikipedia, the free encyclopedia
		Gravel is rock that is of a certain grain size range.
		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).
		Where natural gravel deposits are insufficient for human purposes, gravel is often produced by quarrying and crushing hard-wearing rocks, such as sandstone, limestone, or basalt.
	en.wikipedia.org /wiki/Gravel (626 words)

	Encyclopedia article: Gravel (Site not responding. Last check: 2007-11-07)
		Sometimes gravel is restricted to rock in the 2-4 millimeter range, with pebble (A small smooth rounded rock) being reserved for rock 4-75 millimeters (some say 64 millimeters).
		It is widely used in concrete (A strong hard building material composed of sand and gravel and cement and water) and as a surfacing for roads and driveways, sometimes with tar (Any of various dark heavy viscid substances obtained as a residue) applied over it.
		Bench gravel - a bed of gravel located on the side of a valley above the present stream bottom, indicating the former location of the stream bed when it was at a higher level.
	www.absoluteastronomy.com /encyclopedia/g/gr/gravel.htm (806 words)

	Encyclopedia: Gravel (Site not responding. Last check: 2007-11-07)
		gravel, particles of rock, i.e., stones and pebbles, usually round in form and intermediate in size between sand grains and boulders.
		Gravel is composed of various kinds of rock, the most common constituent being the mineral quartz.
		Deposits of gravel are formed as a result of the weathering of rocks and the erosive and concentrating action of rivers and waves.
	www.nationmaster.com /encyclopedia/Gravel (1395 words)

	National Gravel Extraction Policy
		The objective of the NMFS Gravel Policy is to ensure that gravel extraction operations are conducted in a manner that eliminates or minimizes to the greatest extent possible any adverse impacts to anadromous fishes and their habitats.
		Gravel extraction is a major and longstanding activity in rivers and streams, particularly in salmonid habitats on the west coast of the United States, including Alaska.
		Gravel extraction, as well as sand mining and dredging, also occurs on the northeast coast of the United States, but primarily in marine habitats such as the lower reaches of large tidal rivers, estuaries and offshore.
	swr.ucsd.edu /hcd/gravelsw.htm (6540 words)

	GeoFacts No. 19, Sand and Gravel
		Sand and gravel particles are eroded fragments of rock formations (and shell material in coastal and former coastal areas); thus, their range in chemical and mineralogical composition is as variable as the rocks from which they are derived.
		Gravel aggregate commonly is used alone or with a binder (such as tar) to pave rural roads and as ballast for railroad tracks.
		Sand and gravel are deposited as alluvium on the floodplains of postglacial streams throughout glaciated and unglaciated areas of Ohio.
	www.dnr.state.oh.us /geosurvey/geo_fact/geo_f19.htm (2004 words)

	Gravel Deposits of the South Platte River Valley
		Gravel in the old valley is covered by a thick deposit of windblown dust.
		Gravel beneath the lowest terraces and floodplain (shown in yellow) is abundant, yields high-quality aggregate, and lies near the surface.
		Gravel is then scraped from the trench with a hoe or shovel and collected at the bottom in a bucket or on a tarpaulin.
	rockyweb.cr.usgs.gov /frontrange/virtour/howepit3.htm (1543 words)

	Chert gravel
		Chert gravel is preserved in vicinity of the Missouri-Arkansas drainage divide in central Anderson County at elevations of 350-360 m.
		Gravels are found north of the Verdigris valley and on the divide between the Verdigris and the Neosho and Cottonwood basins.
		Gravels on the Missouri-Arkansas divide in Anderson County were earlier interpreted as an eastern extension of gravel trends along the Cottonwood and Neosho valleys (Fyre 1955; Aber 1985).
	www.emporia.edu /earthsci/chert/chert.htm (5031 words)

	gravel. The Columbia Encyclopedia, Sixth Edition. 2001-05 (Site not responding. Last check: 2007-11-07)
		A small percentage of clay must be present to act as a binder when gravel is used in macadam for road surfaces.
		When used as a coarse aggregate for concrete, gravel must be clean and free from clay and organic matter.
		In areas where natural deposits are inadequate, gravel is produced by quarrying and crushing durable rocks, such as sandstone, limestone, or basalt.
	www.bartleby.com /65/gr/gravel.html (230 words)

	Ohio Stream Management Guide No. 22 Gravel Riffles Provide In-Stream Structure
		The thickness of the gravel should generally be less than one foot and not more than the depth of the water at normal stage flow so that it doesn't extend out of the water and back up a significant pool or otherwise act as a dam.
		To concentrate lower stream flows, the gravel should be placed so that it is slightly lower in the middle of the channel and higher along the streambanks as illustrated in figure 1.
		Gravel should be sized so that it is stable at low and medium flows but erodible at high or bankfull flows.
	www.dnr.state.oh.us /water/pubs/fs_st/stfs22.htm (1038 words)

	GRAVEL (Site not responding. Last check: 2007-11-07)
		In geology, gravel is any loose rock that is at least two millimeters in its largest dimension, and no more than 75 millimeters.
		Sometimes gravel is restricted to rock in the 2-4 millimeter range, with pebble being reserved for rock 4-75 millimeters.
		It is licensed under the GNU free documentation license.
	www.yotor.org /wiki/en/gr/Gravel.htm (293 words)

	Gravel Walks and Drives
		Upkeep is the great bugaboo of gravel, of course, and the reason why it fell from favor in the first place.
		While gravel does shift around during plowing, any displacement is easily addressed with a rake in the spring.
		Gravel's loose, informal surface lends a certain country air to the landscape.
	magazines.ivillage.com /countryliving/garden/your/articles/0,,284660_526368,00.html (559 words)

	Riding Techniques -- Gravel and Dirt
		The key is to enter the gravel area, keeping the front wheel straight and a light grip on the handlebars, at a steady speed that can reasonably see you through the area.
		A "death grip" on the handlebar also lessens the bike's ability to negotiate gravel as you are forcing the bike to follow a hard, straight line when it fact it naturally needs to "wiggle" a bit to get through gravel.
		It always happens on gravel (we live on farm so everything is gravel or dirt) and it does seem that if I try to turn at all, the front end twists around and it tilts over just enough that I can't keep it upright.
	www.vtwinmama.com /gravel.htm (8702 words)

	Instream Gravel Mining and Related Issues Southern Missouri
		In southern Missouri, gravel is mined extensively from the channels and flood plains of streams.
		Instream gravel used by these 46 counties in 1999 was estimated to be 376,000 tons at an approximate value of $1,454,000.
		In addition to changing the aesthetic character of a stream, instream gravel mining potentially alters channel depth and width, riparian vegetation, streambed substrate texture, bank vegetation and substrate, and aquatic habitat, as shown in the two photographs of Barren Fork, Miller County, Missouri, within and downstream from gravel mining (figs.
	mo.water.usgs.gov /fact_sheets/wtrqual/Gravel (1901 words)

	Gimblett Gravels : About
		Gimblett Gravels is a group of New Zealand wineries and winegrowers in the Hawkes Bay region of the eastern North Island.
		The Gimblett Gravels appellations, covering 800ha, with 65 per cent in producing vineyards, is strictly determined by the gravely soils laid down by the old Ngaruroro River, which were exposed after a huge flood in the 1860's.
		The Gimblett Gravels district is up to three degrees Celsius warmer during the day in summer and autumn, compared with most other areas in Hawke's Bay.
	www.gimblettgravels.com (363 words)

	GRAVEL
		GRAVEL is a joint project of the Institute for New Media Studies in the School of Journalism and Mass Communication, the Digital Technology Center, and the Digital Media Center of the University of Minnesota.
		GRAVEL is intended to be a resource to the growing game research interests on the University of Minnesota campus through providing short courses, a lecture series, a grants program for faculty, and other programs.
		GRAVEL is intended to bridge the interests and expertise on the UM campus with community and commercial enterprises for the mutual exploration and advanced understanding of game and virtual reality environments.
	www.inms.umn.edu /gravel (311 words)

	Gravel - An astronomical simulator based on Newton's Law of Gravity
		Gravel is a simple simulation which models the behaviour of astronomical objects in space, according to Newton's Law of Gravity.
		The basic principles are quite simple: For each object, Gravel calculates the acceleration caused by the mass and distance of the other objects, and adds that acceleration to the object's speed.
		Gravel v3 is now being developed using the recently released Microsoft Visual C++ Toolkit 2003 with Microsoft's Win32 Platform SDK Feb2003.
	www.rclsoftware.org.uk /gravel (644 words)

	gravel on Encyclopedia.com
		Rubens Barrichello of Brazil and Ferrari in the gravel
		A curving, gravel and timber path, edged by lush grasses and shrubs, in the garden of Jim Massey in Belleville, Illinois.
		Contestants in a moto cross throw up dust and gravel as they negotiate a bend of the circuit.
	www.encyclopedia.com /html/g1/gravel.asp (793 words)

	Berkshire Taconic :: Geography :: When Water Flows Through Gravel
		This gravel can soak up the flow of the streams, thus serving as an underground reservoir that stores up water in the spring and releases it slowly through the dry summer.
		These wedges of gravel were left behind by the glaciers and are known to geologists as "kame terraces." You can see evidence of them during times of low water flow, like during most summers.
		The dry zone actually hides the full gravel "reservoir" below and is one of the clearest visible indications of the incredibly active underground flow of water in the region.
	www.lastgreatplaces.org /berkshire/geography/art6458.html (223 words)

	DMR - Mineral Resources - Sand & Gravel
		Gravel particles are those that are coarser than sand and pass through a 3 inch square hole.
		Availability of sand and gravel and aggregate in general can affect the viability of economic development.
		A major center of sand and gravel production is south east of Fredericksburg from where it is shipped by rail to the Northern Virginia/Washington D.C, market.
	www.mme.state.va.us /DMR/DOCS/MinRes/SAND/sand.html (303 words)

	Gravel Mining
		Gravel is required to construct roads, sidewalks, and gardens.
		Sometimes gravel removal from a stream is done incorrectly and causes harm to the flow of the stream and the habitat of the plants and animals living in the stream.
		Many times, people wanting to remove gravel from a stream must have a permit to remove gravel from the stream.
	outreach.missouri.edu /mowin/Project31903/SpRiver/gravelmine.html (338 words)

	Sand & Gravel
		The terms "sand" and "gravel" are sometimes interchanged by aquarists.
		Anyway, the new gravel has now been in my tank for almost a week (a new beach in the aquascape), and everything has been fine.
		Commercial gravel (as sold in a pet shop as opposed to a building supply depot) should be clearly labelled as to whether it is meant for freshwater (no carbonates) or saltwater tanks (carbonates O.K.).
	www.thekrib.com /TankHardware/sand.html (4284 words)

	Gravel from LiveJournal (Site not responding. Last check: 2007-11-07)
		I remember my birthday, and I went to the den he used to call his and watched him walk across the lawn that used to be his own, from a car that he had driven...
		The gravel underneath was good enough for their purposes—training small groups at a time—and they’d jury-rigged some lights so it wasn’t always so dark.
		Gravel Day On the scond Monday of the first term of the year, if the wather be at all favourable, it has been customary from time immemorial to hold a college meeting and petition the the president for...
	www.ljseek.com /search/Gravel (766 words)

	National Stone, Sand & Gravel Association (NSSGA): Welcome
		December 4-6, Memphis, TN NSSGA is the National Stone, Sand and Gravel Association.
		The association represents the crushed stone, sand and gravel-or aggregates-industries.
		More than three billion tons of aggregates (or 2.86 billion metric tons) were produced in the U.S. in 2004 at a value of approximately $16 billion, contributing $37.5 billion to the GDP of America.
	www.nssga.org (473 words)

	Gravel Washers for Cleaning Gravel in Aquariums.
		Cultured Gravel is normal Aquarium Gravel that has been in a healthy well-established aquarium, fish bowl, or pond long enough for the beneficial bacteria to grow and become established on the pieces of gravel.
		It is much better to get cultured gravel that is already covered with beneficial bacteria rather than waiting weeks for new gravel to become cultured gravel.
		Cultured gravel is very important in a fish bowl that does not have a filter, but an aquarium with a BIO-Wheel filter does not need gravel.
	www.aquariumfish.net /information/equipment_2_p2.htm (1509 words)

	DIY - Python Gravel Cleaner
		Put the gravel cleaner in the tank and slowly turn on the shut off valve, it will sputter some at first.
		Continue cleaning the gravel until you remove the desired amount of water from your tank.
		Holding the gravel cleaner in the sink, slowly turn the shut off valve on till you rinse the hose out really well.
	www.cichlid-forum.com /articles/diy_python.php (637 words)

	Welcome to Feltes Sand & Gravel (Site not responding. Last check: 2007-11-07)
		Feltes Sand & Gravel is the leading producer of sand and gravel construction materials in the Chicago area.
		Quality sand and gravel materials and Feltes' ongoing dedication to customer satisfaction are the keys that have made us a trusted name for over 80 years.
		Feltes Sand and Gravel of Elburn, IL has been selected by The National Stone, Sand and Gravel Association as one of two tour locations for the association’s Automation...
	www.feltesgravel.com (281 words)

	Aquarium Gravel and Gravel Washers for Cleaning Gravel in Aquariums.
		is normal aquarium gravel with a layer of beneficial bacteria growing on the surface of the pieces of gravel.
		If you like the appearance of gravel, and you've mastered feeding your fish so there are no uneaten bits of fish food to pollute the gravel, then add a thin layer of gravel not more than 1/4 inch thick.
		If you decide to have gravel in your aquarium, use your net to stir it gently to see if the gravel is full of waste.
	www.aquariumfish.net /information/equipment_2.htm (893 words)

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