FACTOID # 6: Michigan is ranked 22nd in land area, but since 41.27% of the state is composed of water, it jumps to 11th place in total area.
 
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Encyclopedia > Alluvium

Alluvium (from the Latin, alluvius, from alluere, "to wash against") is soil or sediments deposited by a river or other running water. Alluvium is typically made up of a variety of materials, including fine particles of silt and clay and larger particles of sand and gravel. Latin is an ancient Indo-European language originally spoken in Latium, the region immediately surrounding Rome. ... Loess field in Germany Soil horizons are formed by combined biological, chemical and physical alterations. ... Sediment is any particulate matter that can be transported by fluid flow and which eventually is deposited as a layer of solid particles on the bed or bottom of a body of water or other liquid. ... Silt is soil or rock derived granular material of a specific grain size. ... The Gay Head cliffs in Marthas Vineyard are made almost entirely of clay. ... Patterns in the sand Sand is a granular material made up of fine rock particles. ... Gravel being unloaded from a barge Gravel is rock that is of a certain grain size range. ...


Flowing water associated with glaciers may also deposit alluvium, but deposits directly from ice are not alluvium (see glacial till). Categories: Geology stubs | Glaciology | Sedimentary rocks ...


A river is continually picking up and dropping solid particles of rock and soil from its bed throughout its length. Where the river flow is fast, more particles are picked up than dropped. Where the river flow is slow, more particles are dropped than picked up. Areas where more particles are dropped are called alluvial or flood plains, and the dropped particles are called alluvium. It has been suggested that this article or section be merged with Floodplain. ...


Even small streams make alluvial deposits, but it is in the flood plains and deltas of large rivers that large, geologically-significant alluvial deposits are found. It has been suggested that this article or section be merged with Floodplain. ... Nile River delta, as seen from Earth orbit. ...


The amount of solid matter carried by a large river is enormous. The names of many rivers derive from the color that the transported matter gives the water. For example, the Huang He in China is, literally translated, Yellow river and the Missouri River in the United States is also called Big Muddy. It has been estimated that the Mississippi River annually carries 406 million tons of sediment to the sea, the Huang He 796 million tons, and the Po River in Italy 67 million tons. For other Yellow Rivers, see Yellow River (disambiguation). ... The Missouri River is a tributary of the Mississippi River in the United States. ... The Mississippi River, derived from the old Ojibwe word misi-ziibi meaning great river (gichi-ziibi big river at its headwaters), is the second-longest river in the United States; the longest is the Missouri River, which flows into the Mississippi. ... For other Yellow Rivers, see Yellow River (disambiguation). ... The Po (Latin: Padus) is a river that flows 652 kilometers (405 miles) eastward across northern Italy, from Monviso (in the Cottian Alps) to the Adriatic Sea near Venice. ...


Alluvium often contain valuable ores such as gold and platinum and a wide variety of gemstones. Such concentrations of valuable ores is termed a placer deposit. General Name, Symbol, Number gold, Au, 79 Chemical series transition metals Group, Period, Block 11, 6, d Appearance metallic yellow Atomic mass 196. ... General Name, Symbol, Number platinum, Pt, 78 Chemical series transition metals Group, Period, Block 10, 6, d Appearance grayish white Atomic mass 195. ... A selection of gemstone pebbles made by tumbling rough rock with abrasive grit, in a rotating drum. ... Iron ore (Banded iron formation) Manganese ore Lead ore Gold ore An ore is a volume of rock containing components or minerals in a mode of occurrence which renders it valuable for mining. ... In geology, a placer deposit is a deposit of earth, sand, or gravel, containing valuable minerals in particles, especially by the side of a river, or in the bed of a mountain stream. ...


Throughout history, many shallow lakes have been filled in with alluvium to leave fertile plains (alluvial soils are often very fertile). The alluvial mud annually deposited by the Nile has enabled the Egyptians to grow crops since at least the 4th millennium BC without artificial fertilization. Fertile may be used in the following conrtext: Fertility, a term used to describe the ability of people or animals to produce healthy offspring. ... The Nile (Arabic: ‎, translit: , Ancient Egyptian iteru) is a major north-flowing river in Africa, generally regarded as the longest river on Earth, though the Amazon in South America contains more water. ... (5th millennium BC – 4th millennium BC – 3rd millennium BC - other millennia) // Events Sumerian city of Ur in Mesopotamia (40th century BC); Sumerian hegemony in Mesopotamia, with the invention of writing, base-60 mathematics, astronomy and astrology, civil law, complex hydrology, the sailboat, the wheel, and the potters wheel, 4000...


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  Results from FactBites:
 
Alluvium - Wikipedia, the free encyclopedia (355 words)
Alluvium is soil or sediments deposited by a river or other running water.
Flowing water associated with glaciers may also deposit alluvium, but deposits directly from ice are not alluvium (see glacial till).
Alluvium is typically made up of a variety of materials.
  More results at FactBites »

 
 

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