Misplaced Pages

Luo River

Article snapshot taken from Wikipedia with creative commons attribution-sharealike license. Give it a read and then ask your questions in the chat. We can research this topic together.

Luohe ( Chinese : 漯河 ; pinyin : Luòhé ; postal : Loho) is a prefecture-level city in central Henan province , China. It is surrounded by the cities of Xuchang , Zhoukou , Zhumadian and Pingdingshan on its north, east, south and west respectively. Its population was 2,367,490 inhabitants at the 2020 Chinese census whom 1,326,687 lived in the built-up (or metro) area made up of Yancheng, Shaoling and Yuanhui districts.

#305694

33-659: "Luo He" redirects here. For the prefecture-level city in Henan, China, see Luohe . Luo River may refer to: Luo River (Henan) (洛河, Luòhé), a tributary of the Yellow River, flows mostly in Henan province of China Luo River (Shaanxi) (洛河, Luòhé), also known as the North Luo River (北洛河, Běi Luòhé), a river in Shaanxi province of China and the second largest tributary of

66-434: A documentary called " Sand Wars " about the impact of the lack of construction sand. It shows the ecological and economic effects of both legal and illegal trade in construction sand. To retrieve the sand, the method of hydraulic dredging is used. This works by pumping the top few meters of sand out of the water and filling it into a boat, which is then transported back to land for processing. All marine life mixed in with

99-610: A high olivine content. Many sands, especially those found extensively in Southern Europe , have iron impurities within the quartz crystals of the sand, giving a deep yellow color. Sand deposits in some areas contain garnets and other resistant minerals, including some small gemstones . Rocks erode or weather over a long period of time, mainly by water and wind, and their sediments are transported downstream. These sediments continue to break apart into smaller pieces until they become fine grains of sand. The type of rock

132-489: A result. People sometimes dig holes in the sand at beaches for recreational purposes, but if too deep they can result in serious injury or death in the event of a collapse. Manufactured sand (M sand) is sand made from rock by artificial processes, usually for construction purposes in cement or concrete. It differs from river sand by being more angular, and has somewhat different properties. In Dubai , United Arab Emirates , sand needed to construct infrastructure and create

165-483: A significant dredging industry, raising environmental concerns over fish depletion, landslides, and flooding. Countries such as China, Indonesia, Malaysia, and Cambodia ban sand exports, citing these issues as a major factor. It is estimated that the annual consumption of sand and gravel is 40 billion tons and sand is a US$ 70 billion global industry. With increasing use, more is expected to come from recycling and alternatives to sand. The global demand for sand in 2017

198-403: A volume of approximately 0.00012 cubic millimetres, to 2 mm, a volume of approximately 4.2 cubic millimetres, the difference in volumes being 34,688 measures difference. Any particle falling within this range of sizes is termed a sand grain . Sand grains are between gravel (with particles ranging from 2 mm up to 64 mm by the latter system, and from 4.75 mm up to 75 mm in

231-429: Is a granular material composed of finely divided mineral particles. Sand has various compositions but is defined by its grain size. Sand grains are smaller than gravel and coarser than silt . Sand can also refer to a textural class of soil or soil type; i.e., a soil containing more than 85 percent sand-sized particles by mass. The composition of sand varies, depending on the local rock sources and conditions, but

264-508: Is called grus in geology or sharp sand in the building trade where it is preferred for concrete, and in gardening where it is used as a soil amendment to loosen clay soils. Sand that is transported long distances by water or wind will be rounded, with characteristic abrasion patterns on the grain surface. Desert sand is typically rounded. People who collect sand as a hobby are known as arenophiles . Organisms that thrive in sandy environments are psammophiles. Only some sands are suitable for

297-472: Is famous for its ham production industry . WH Group , the world's largest pork producer in the world, and owner of Smithfield Foods , has its Chinese headquarters in Luohe. Much of Luohe's natural resources come from the rivers of the city. The city's rivers are bountiful with rock salt of a high enough grade to be used in food preparation. The rivers of the city also have a particular type of sand which

330-572: Is in high demand. Desert sand, although plentiful, is not suitable for concrete. Fifty billion tons of beach sand and fossil sand are used each year for construction. The exact definition of sand varies. The scientific Unified Soil Classification System used in engineering and geology corresponds to US Standard Sieves, and defines sand as particles with a diameter of between 0.074 and 4.75 millimeters. By another definition, in terms of particle size as used by geologists , sand particles range in diameter from 0.0625 mm (or 1 ⁄ 16  mm)

363-726: Is located near the Funiu Mountains and the Huaibei Plains , and the city's 81 different rivers are all a part of the Huai River system. Consistent with the broader trends of China's economic expansion, Luohe city has reported consistent GDP growth throughout the 2010s. Luohe is also famous for being home to Nanjie Village , which has gained fame due to its Maoist-styled collective-ownership . The city's main agricultural products include wheat, corn, cotton, peanut oil, vegetables, mushrooms, melons, and fruit. The city

SECTION 10

#1732765997306

396-473: Is suitable for being used in building materials . A commercial center since ancient times , Luohe presently is home to many light industries such as food preparation, textile production, plastic production, and shoe production. Heavy industries, such as cement production, are also present. The city's tertiary industry has grown in recent years faster than overall economy. As of 2018, the city's tertiary industry had an output of 38.44 billion Yuan, 31.1% of

429-474: Is the most common mineral resistant to weathering . The composition of mineral sand is highly variable, depending on the local rock sources and conditions. The bright white sands found in tropical and subtropical coastal settings are eroded limestone and may contain coral and shell fragments in addition to other organic or organically derived fragmental material, suggesting that sand formation depends on living organisms, too. The gypsum sand dunes of

462-500: Is the primary form of sand apparent in areas where reefs have dominated the ecosystem for millions of years, as in the Caribbean . Somewhat more rarely, sand may be composed of calcium sulfate , such as gypsum and selenite , as is found in places such as White Sands National Park and Salt Plains National Wildlife Refuge in the U.S. Sand is a non-renewable resource over human timescales, and sand suitable for making concrete

495-514: The Krumbein phi scale , where size is Φ = -log 2 D; D being the particle size in mm. On this scale, for sand the value of Φ varies from −1 to +4, with the divisions between sub-categories at whole numbers. The most common constituent of sand, in inland continental settings and non-tropical coastal settings, is silica (silicon dioxide, or SiO 2 ), usually in the form of quartz , which, because of its chemical inertness and considerable hardness,

528-594: The United States Department of Agriculture was 0.05 mm. A 1953 engineering standard published by the American Association of State Highway and Transportation Officials set the minimum sand size at 0.074 mm. Sand feels gritty when rubbed between the fingers. Silt , by comparison, feels like flour . ISO 14688 grades sands as fine, medium, and coarse with ranges 0.063 mm to 0.2 mm to 0.63 mm to 2.0 mm. In

561-687: The White Sands National Park in New Mexico are famous for their bright, white color. Arkose is a sand or sandstone with considerable feldspar content, derived from weathering and erosion of a (usually nearby) granitic rock outcrop. Some sands contain magnetite , chlorite , glauconite , or gypsum . Sands rich in magnetite are dark to black in color, as are sands derived from volcanic basalts and obsidian . Chlorite - glauconite bearing sands are typically green in color, as are sands derived from basaltic lava with

594-487: The Sahara is sand dunes, while 70% is bare rock. The wind is responsible for creating these different environments and shaping the sand to be round and smooth. These properties make desert sand unusable for construction. Beach sand is also formed by erosion. Over thousands of years, rocks are eroded near the shoreline from the constant motion of waves and the sediments build up. Weathering and river deposition also accelerate

627-473: The United States, sand is commonly divided into five sub-categories based on size: very fine sand ( 1 ⁄ 16 – 1 ⁄ 8  mm diameter), fine sand ( 1 ⁄ 8  mm – 1 ⁄ 4  mm), medium sand ( 1 ⁄ 4  mm – 1 ⁄ 2  mm), coarse sand ( 1 ⁄ 2  mm – 1 mm), and very coarse sand (1 mm – 2 mm). These sizes are based on

660-723: The Wei River, which is the longest tributary of the Yellow River. Luo River (Guangdong) (螺河, Luohe), river in Guangdong , China; flows into South China Sea Luo River (Fujian) (洛江, Luojiang), river in Fujian, China; flows into Quanzhou Bay of Taiwan Strait See also [ edit ] Lô River , river in Vietnam Luo (disambiguation) [REDACTED] Topics referred to by the same term This disambiguation page lists articles about distinct geographical locations with

693-502: The city's total. In 2018, Luohe City's secondary vocational education enrolled 9,200 students (excluding technical schools), with 27,800 students and 8,100 graduates. Regular high schools have 15,900 students, 47,400 students and 15,500 graduates. There are 35,100 students enrolled in junior high schools, 98,900 students and 30,500 graduates. Primary school enrollment was 35,500, with 205,700 students and 34,800 graduates. There are 98,100 children in kindergartens. Sand Sand

SECTION 20

#1732765997306

726-441: The construction industry, for example for making concrete . Grains of desert sand are rounded by being blown in the wind, and for this reason do not produce solid concrete, unlike the rough sand from the sea. Because of the growth of population and of cities and the consequent construction activity there is a huge demand for these special kinds of sand, and natural sources are running low. In 2012 French director Denis Delestrac made

759-438: The extracted sand is killed and the ecosystem can continue to suffer for years after the mining is complete. Not only does this affect marine life, but also the local fishing industries because of the loss of life, and communities living close to the water's edge. When sand is taken out of the water it increases the risk of landslides, which can lead to loss of agricultural land and/or damage to dwellings. Sand's many uses require

792-585: The former) and silt (particles smaller than 0.0625 mm down to 0.004 mm). The size specification between sand and gravel has remained constant for more than a century, but particle diameters as small as 0.02 mm were considered sand under the Albert Atterberg standard in use during the early 20th century. The grains of sand in Archimedes ' The Sand Reckoner written around 240 BCE, were 0.02 mm in diameter. A 1938 specification of

825-409: The most common constituent of sand in inland continental settings and non- tropical coastal settings is silica (silicon dioxide, or SiO 2 ), usually in the form of quartz . Calcium carbonate is the second most common type of sand. One such example of this is aragonite , which has been created over the past 500   million years by various forms of life, such as coral and shellfish . It

858-437: The process of creating a beach, along with marine animals interacting with rocks, such as eating the algae off of them. Once there is a sufficient amount of sand, the beach acts as a barrier to keep the land from eroding any further. This sand is ideal for construction as it is angular and of various sizes. Marine sand (or ocean sand) comes from sediments transported into the ocean and the erosion of ocean rocks. The thickness of

891-461: The rate the sand can replenish, making it a non-renewable resource. Sand dunes are a consequence of dry conditions or wind deposition. The Sahara Desert is very dry because of its geographic location and proximity to the equator . It is known for its vast sand dunes, which exist mainly due to a lack of vegetation and water. Over time, wind blows away fine particles, such as clay and dead organic matter, leaving only sand and larger rocks. Only 15% of

924-846: The same name. If an internal link led you here, you may wish to change the link to point directly to the intended article. Retrieved from " https://en.wikipedia.org/w/index.php?title=Luo_River&oldid=1251705307 " Category : Place name disambiguation pages Hidden categories: Short description is different from Wikidata All article disambiguation pages All disambiguation pages Luohe The prefecture level city of Luohe directly administers 3 districts and 2 counties , which themselves administer 7 subdistricts , 49 towns and townships , 1,262 villages , and 78 residential communities . Luohe spans parts of central and southern Henan Province , spanning from 113°27′E to 114°16′E in terms of longitude , and from 33°24′N to 33°59′N in terms of latitude . The city

957-460: The sand because they do not have as much time to dissolve away. The term for sand formed by weathering is "epiclastic." Sand from rivers are collected either from the river itself or its flood plain and accounts for the majority of the sand used in the construction industry. Because of this, many small rivers have been depleted, causing environmental concern and economic losses to adjacent land. The rate of sand mining in such areas greatly outweighs

990-480: The sand layer varies, however it is common to have more sand closer to land; this type of sand is ideal for construction and is a very valuable commodity. Europe is the main miners of marine sand, which greatly hurts ecosystems and local fisheries. The study of individual grains can reveal much historical information as to the origin and kind of transport of the grain. Quartz sand that is recently weathered from granite or gneiss quartz crystals will be angular. It

1023-411: The sediment originated from and the intensity of the environment give different compositions of sand. The most common rock to form sand is granite , where the feldspar minerals dissolve faster than the quartz , causing the rock to break apart into small pieces. In high energy environments rocks break apart much faster than in more calm settings. In granite rocks this results in more feldspar minerals in

Luo River - Misplaced Pages Continue

1056-493: The user to wear respiratory protection to avoid breathing the resulting fine silica dust . Safety data sheets for silica sand state that "excessive inhalation of crystalline silica is a serious health concern." In areas of high pore water pressure , sand and salt water can form quicksand , which is a colloid hydrogel that behaves like a liquid. Quicksand produces a considerable barrier to escape for creatures caught within, who often die from exposure (not from submersion) as

1089-635: Was 9.55 billion tons as part of a $ 99.5 billion industry. In April 2022, the United Nations Environment Programme (UNEP) published a report stating that 50 billion tons of sand and gravel were being used every year. The report made 10 recommendations, including a ban on beach extraction, to avert a crisis, and move toward a circular economy for the two resources. While sand is generally non-toxic, sand-using activities such as sandblasting require precautions. Bags of silica sand used for sandblasting now carry labels warning

#305694