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Encyclopedia > Loess
Look up loess in Wiktionary, the free dictionary.
Loess in Hungary has travelled by wind from Asia
Loess in Hungary has travelled by wind from Asia
This article is about the geologic material. For the statistical technique see Local regression.

Among the classifications of soil types, loess, from the German Löss, and ultimately from Swiss German lösch (loose), pronounced in several different ways in English (IPA: [ləs, lʌs, lʌrs, lo.əs]), it is a fine, silty, windblown (eolian) type of unconsolidated deposit. (The term sometimes refers to the soil derived from it.) It is derived from glacial deposits, where glacial activity has ground rocks very fine (rock flour). After drying, these deposits are highly susceptible to wind erosion, and downwind deposits may become very deep, even a hundred metres or more, as in areas of China and the midwestern United States. Loess deposits are geologically unstable by nature, and will erode even without being disturbed by humans; even well-managed loess farmland can experience dramatic erosion of well over 25 tonnes per hectare per year. Wikipedia does not have an article with this exact name. ... Wiktionary (from wiki and dictionary) is a multilingual, Web-based project to create a free content dictionary, available in over 150 languages. ... Image File history File links Download high resolution version (2560x1920, 2121 KB) File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... Image File history File links Download high resolution version (2560x1920, 2121 KB) File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... LOESS is one of many modern modeling methods that build on classical methods, such as linear and nonlinear least squares regression. ... In agriculture, soil type usually refers to the different sizes of mineral particles in a particular sample. ... This article or section does not cite its references or sources. ... Articles with similar titles include the NATO phonetic alphabet, which has also informally been called the “International Phonetic Alphabet”. For information on how to read IPA transcriptions of English words, see IPA chart for English. ... Silt is soil or rock derived granular material of a specific grain size. ... Eolian (or aeolian) processes pertain to the activity of the winds. ... suck my shlong dick cause soil is my life pedosphere is positioned at the interface of the lithosphere and biosphere with the atmosphere and hydrosphere. ... A glacier is a large, persistent body of ice, formed largely of compacted layers of snow, that slowly deforms and flows in response to gravity. ... Rock flour consists of clay sized particles of rock generated by glacial erosional actions. ... The Midwest is a common name for a region of the United States of America. ... A tonne or metric ton (symbol t), sometimes referred to as a metric tonne, is a measurement of mass equal to 1,000 kilograms. ... A hectare (symbol ha) is a unit of area, equal to 10 000 square metres, commonly used for measuring land area. ...


Hungary has several areas that are covered by loess. At locations such as Dunaújváros and Balatonakarattya, loess walls are exposed as "reefs" (see illustration). Similar formations exist in Bulgaria on the south bank of the Danube. Dunaújváros (1951–1961 Sztálinváros) is a city in Central Hungary, along the Danube (Hungarian name: Duna) river. ... The Danube (ancient Danuvius, Iranian *dānu, meaning river or stream, ancient Greek Istros) is the longest river in the European Union and Europes second longest river. ...


The central part of Belgium is also covered by thick loess stacks. An interesting loess site where late Middle and Late Pleistocene Neanderthal artifacts were found within the soils between the loess layers is Veldwezelt-Hezerwater. The Pleistocene epoch (IPA: ) is part of the geologic timescale. ... Binomial name †Homo neanderthalensis King, 1864 Neanderthal range Synonyms Palaeoanthropus neanderthalensis The Neanderthal (IPA pronunciation: ), (Homo neanderthalensis) or Neandertal was a species of the Homo genus that inhabited Europe and parts of western Asia. ... // Context The successive archaeological excavation campaigns at Veldwezelt-Hezerwater, Belgium provide important remains of at least five separate Middle Palaeolithic valley settlements. ...


Loess grains are angular, with little polishing or rounding, composed of crystals of quartz, feldspar, mica and other minerals. Because the grains are angular, loess will often stand in banks for many years without slumping. This soil has a characteristic called "vertical cleavage", which makes it easily excavated to form cave dwellings; this is still a popular method of making human habitations in some parts of China. Quartz is one of the most common minerals in the Earths continental crust. ... Lunar Ferroan Anorthosite #60025 (Plagioclase Feldspar). ... Rock with mica Mica sheet Mica flakes The mica group of sheet silicate minerals includes several closely related materials having highly perfect basal cleavage. ...


But it is also highly erodible by water or wind, and soils underlain by loess tend to be excessively drained (droughty). As the grains weather, they release minerals, which means that soils derived from loess are usually very rich. One theory states that the fertility of loess soils is due largely to electron exchange capacity (EEC) and pore space (the ability of plants to absorb nutrients from the soil, and the air-filled space in the soil, respectively). Unlike other soil, loess's fertility is not due to organic matter content, which actually tends to be rather low (unlike tropical soils, which depend almost wholly on organic matter for their fertility). In the Loess Hills of Iowa, the fertility of the region is owed to the prairie topsoils built by 10,000 years of post-glacial accumulation of organic-rich humus as a consequence of a persistent grassland biome. When the valuable A-horizon topsoil is eroded or degraded, the underlying loess soil is infertile, and requires the addition of fertilizers in order to support agriculture. In general, the fertility of farmland in the Loess Hills of Iowa is lower than in the adjacent alluvial floodplain of the Missouri River. Weathering is the process of breaking down rocks, soils and their minerals through direct contact with the atmosphere. ... Snow geese flying in front of the loess hills at Squaw Creek National Wildlife Refuge in the Missouri River bottoms near Mound City, Missouri The Loess Hills are a formation of wind-deposited loess soil in the westernmost part of Iowa and Missouri along the Missouri River. ... This article is about the U.S. State. ... Topsoil is the uppermost layer of soil, usually the top six to eight inches. ... This does not cite its references or sources. ... Severe soil erosion in a wheat field near Washington State University, USA. For erosion as an operation of Mathematical morphology, see Erosion (morphology) Erosion is displacement of solids (soil, mud, rock and other particles) by the agents of ocean currents, wind, water, or ice by downward or down-slope movement... Spreading manure, an organic fertilizer Fertilizers (British English fertilisers) are compounds given to plants to promote growth; they are usually applied either via the soil, for uptake by plant roots, or by foliar feeding, for uptake through leaves. ... Alluvium is soil land deposited by a river or other running water. ... Gravel floodplain of a glacial river near the Snow Mountains in Alaska, 1902. ... The Missouri River is a tributary of the Mississippi River in the United States. ...


Though in geological time loess has an incredible rate of erosion, in a more human time scale loess is very durable and resistant to maltreatment. In China, for instance, loess deposits along the Yellow River have been farmed and have produced phenomenal yields for over a thousand years; though a large amount of the credit for this goes to the farmers themselves, as Chinese farmers were the first to practice active erosion control, which also started about one thousand years ago. The largest deposit of loess in the United States, the Loess Hills along the border of Iowa and Nebraska, has also survived under intensive farming and, in this case, poor farming practices. For almost 150 years this loess deposit was farmed with Mouldboard Ploughs and fall tilled (both practices are intensely erosive); at times it suffered erosion rates of over 100 tonnes per hectare per year. However, today this loess deposit is worked as low till, or no till, in all areas and is aggressively terraced. This article cites very few or no references or sources. ... The Yellow River (Traditional Chinese: ; Simplified Chinese: ; Hanyu Pinyin: Huáng Hé ; Wade-Giles: Hwang-ho, sometimes simply called the River in ancient Chinese) is the second longest river in China (after Yangtze River) and the fourth longest in the world, at 3,395 km long [1]. Originating in the... Snow geese flying in front of the loess hills at Squaw Creek National Wildlife Refuge in the Missouri River bottoms near Mound City, Missouri The Loess Hills are a formation of wind-deposited loess soil in the westernmost part of Iowa and Missouri along the Missouri River. ... This article is about the U.S. State. ... Official language(s) English Capital Lincoln Largest city Omaha Largest metro area Omaha Area  Ranked 16th  - Total 77,421 sq mi (200,520 km²)  - Width 210 miles (340 km)  - Length 430 miles (690 km)  - % water 0. ... To meet Wikipedias quality standards, this article or section may require cleanup. ... Terraced vineyards near Lausanne The Incan terraces at Písac are still used today. ...


Loess soil forms sharp topographic hills east of the Mississippi River and Yazoo River in western Mississippi north and south of Vicksburg. These deposits are in excess of 100 feet (30 m) thick (comparable to those in Iowa) immediately above the river valleys, to which they are sub-parallel, and thin to trace thickness within 25 miles (40 km) east. Streams and gulleys are incised very deeply and sharply between the linear loess ridges making topography very important in the conduct of military operations for the Vicksburg Campaign. The loess soil near Vicksburg is apparently contemporaneous with the last phases of the last glaciation in the midwest, sometimes called the Altamont and Bemis stages of the Wisconsin glaciation in Iowa. Older loess deposits have not been identified in the Vicksburg area. Faunal remains include terrestrial gastropods and mastodons. 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 named river in North America, with a length of 2320 miles (3733 km) from Lake Itasca to the Gulf of Mexico. ... hTe Yazoo River is a river in the U.S. state of Mississippi and the second longest tributary of the Mississippi River that flows into that river from the east (the longest is the Ohio River). ... This article does not cite any references or sources. ... Vicksburg is the name of some places in the United States of America: Vicksburg, Michigan Vicksburg, Mississippi Vicksburg may also refer to the Battle of Vicksburg in the American Civil War (fought near the Mississippi city above). ... Lithograph of the Mississippi River Squadron running the Confederate blockade at Vicksburg on April 16, 1863. ...


External links

  • http://www.backyardnature.net/loess/loess.html Loess Hills of the Lower Mississippi Valley
  • The Bibliography of Aeolian Research

  Results from FactBites:
 
Loess (0 words)
Loess is a geologic term that refers to deposits of silt (sediment with particles 2-64 microns in diameter) that have been laid down by wind action (aeolian activity to geologists).
Because the source of the silt is the outwash from the glaciers, loess deposits are frequently most extensive and thickest downwind from large river valleys.
Notice that the loess is thickest just east of the major river valleys, indicating that prevailing winds were from the west.
Loess Hills Motorcycle Rally (128 words)
The eighth annual Loess Hills Motorcycle Rally will be held September 7, 8 and 9, 2007, in the beautiful Loess Hills of Iowa.
The Loess Hills Motorcycle Rally is a one-of-a-kind experience.
The rally emerged in the fall of 2000 as a fun-filled two day event drawing bikers from all over the region.
  More results at FactBites »

 
 

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