Sierra Acai Company
Sierra Acai Company
Open 7 Days a Week
MonaVie Independent Distributor
Distributor Training
Shop Online
Enroll Now
Buy Wholesale and maintain an Active status for 2 months and we will refund your $39 Distributor Fee
Friends
Buy Wholesale and maintain an Active status for 2 months and we will refund your $39 Distributor Fee
20-September-2008 09:29:07 - Silt For other uses, see Silt disambiguation. Silt is soil or rock derived granular material of a specific grain size. Silt may occur as a soil or alternatively as suspended sediment in a water column of any surface water body. It may also exist as deposition soil at the bottom of a water body. Contents 1 Source 2 Grain size criteria 3 Environmental impacts 4 See also 5 References Source Silt is generated by a variety of modi capable of breaking and splitting up generally sand-sized quartz crystals of primary rocks by exploiting deficiencies in their lattice1. These involve chemical weathering of rock2 and regolith, and a number of physical weathering processes such as frost shattering3 and haloclasty4. However, it is mainly by abrasion through transport-processes such as fluvial comminution, aeolian attrition and glacial grinding 5 most effectively operating in semi-arid environments 6 that substantial quantities of silt are produced. Silt is sometimes known as 'rock flour' or 'stone dust', especially when produced by glacial action. Mineralogically, silt is composed mainly of quartz and feldspar. Sedimentary rock composed mainly of silt is known as siltstone. Grain size criteria In the Udden-Wentworth scale due to Krumbein, silt particles range between 1â?„256 and 1â?„16 mm 3.9 to 62.5 μm, larger than clay but smaller than a sand. ISO 14688 grades silts between 0.002 mm and 0.063 mm, with clay particles being smaller and sands larger. In actuality, silt is chemically distinct from clay, and unlike clay, grains of silt are approximately the same size in all dimensions; furthermore, their size ranges overlap. Clays are formed from thin plate-shaped particles held together by electrostatic forces, so present a cohesion. According to the USDA Soil Texture Classification system, the sand-silt distinction is made at the 0.05 mm particle size.7 The USDA system has been adopted by the Food and Agriculture Organization FAO. In the Unified Soil Classification System USCS and the AASHTO Soil Classification system, the sand-silt distinction is made at the 0.075 mm particle size i.e. material passing the #200 sieve. Silts and clays are distinguished by their plasticity. Silt deposits around house and car in New Orleans left by flooding from a breach in the London Avenue Canal Silt deposits around house and car in New Orleans left by flooding from a breach in the London Avenue Canal Environmental impacts Silt can occur as a deposit or as material transported by a stream or by a current in the ocean. Silt is easily transported in water and is fine enough to be carried long distances by air as 'dust'. Thick deposits of silty material resulting from aeolian deposition are often called loess a German term or limon French. Silt and clay contribute to turbidity in water. The main source of river siltation and storm sewer sedimentation in urban areas is disturbance of soil by construction activity. The main cause of river siltation in rural areas is erosion from extensive plowing of farm fields, clearcut logging or slash and burn treatment of forests. When the total ground surface is stripped of vegetation, the upper soils are vulnerable to both wind and water erosion. In a number of regions of the earth, entire sectors of a country have been rendered unproductive; for example, on the Madagascar high central plateau, comprising approximately ten percent of that country's land area, virtually the entire landscape is sterile of vegetation, with gully erosive furrows typically in excess of 50 meters deep and one kilometer wide. Shifting cultivation is a farming system which sometimes incorporates the slash and burn method in some regions of the world. The resulting sediment load can cause extensive fish kills, hampering economic development. Silt, deposited by annual floods along the Nile River, created the rich and fertile soil that sustained the ancient Egyptian civilization. This silt was depended on for this purpose. A decrease in silt deposited by the Mississippi River throughout the 20th century due to a system of levees has contributed to the disappearance of protective wetlands and barrier islands in the delta region surrounding New Orleans.1 See also Erosion control Nonpoint source pollution Sediment control Silt fence References ^ Moss, A J; Green, P 1975. Sand and silt grains: Predetermination of their formation and properties by microfractures in quartz. Australian Journal of Earth Sciences 22 4: 485-495. doi:10.1080/00167617508728913. ^ Nahon, D; Trompette, R 1982. Origin of siltstones:glacial grinding versus weathering. Sedimentology 29: 25-35. doi:10.1111/j.1365-3091.1982.tb01706.x. ^ Lautridou, J P; Ozouf, J C 1982. Experimental frost shattering: 15 years of research at the Centre de Geomorphologie du CNRS. Progress in Physical Geography 6: 215-232. doi:10.1177/030913338200600202. ^ Goudie, A S; Viles, H A 1995. The nature and pattern of debris liberated by salt weathering: a laboratory study. Earth Surface Processes and Landforms 9: 95-98. doi:10.1002/esp.3290090112. ^ Wright, J S; Smith, B J; Whalley W B 1998. Mechanisms of loess-sized quartz silt production and their relative effectiveness: laboratory simulations. Geomorphology 23: 15-34. doi:10.1016/S0169-555X9700084-6. ^ Haberlah, D 2007. A call for Australian loess. AREA 39 2: 224-229. doi:10.1111/j.1475-4762.2007.00730.x. ^ Particle Size 618.43. National Soil Survey Handbook Part 618 42-55 Soil Properties and Qualities. United States Department of Agriculture - Natural Resource Conservation Service. Retrieved on 2006-05-31. v d e 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 · Lateral earth pressure 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 Field tests Crosshole sonic logging · Nuclear Densometer Test Foundations Bearing capacity · Shallow foundation · Deep foundation · Dynamic load testing · Wave equation analysis Retaining walls 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 Instrumentation for Stability Monitoring Deformation monitoring · Automated Deformation Monitoring Retrieved from http://en..org/wiki/Silt Categories: Soil | Sedimentology | Sediments | Water pollution Views Article Discussion this page History Personal tools Log in / create account Navigation Main page Contents Featured content Current events Random article Search Go Search Interaction Community portal Recent changes Contact Donate to Help Toolbox What links here Related changes Upload file Special pages Printable version Permanent link Cite this page Languages Чăвашла Dansk Deutsch Eesti Ù?ارسی Français Italiano Lietuvių Nederlands 日本語 ‪Norsk bokmÃ¥l‬ ‪Norsk nynorsk‬ Português РуÑ?Ñ?кий Svenska Tiếng Việt This page was last modified on 7 August 2008, at 14:53
39 Reasons to Drink Acai Juice Every Day
What is MonaVie - Watch the 8-minute video
Discovering MonaVie video
The Power of You video
Log into your Wholesale MonaVie Account
So many of us do not eat a balanced diet, get enough sleep, have too much stress, or are impacted with toxins and pollutants. Drinking 2 ounces of MonaVie twice a day will help your body detoxify as well as build your immune system. Its the smartest thing you can do for yourself, so start today. Buying MonaVie through our company guarantees you support 7 days a week and, if you would like to share MonaVie with your family and friends we will guide you from start to finish.
1. Click on Enroll Now (30 - 55% off retail price)
2. Pay $39 for your Wholesale ID number.
3. NO minimum order required.
4. MonaVie is delivered to your door in 3 to 5 days.