Detroit is the largest and most populous city in the U. S. state of Michigan, the largest United States city on the United States–Canada border, the seat of Wayne County. The municipality of Detroit had a 2017 estimated population of 673,104, making it the 23rd-most populous city in the United States; the metropolitan area, known as Metro Detroit, is home to 4.3 million people, making it the second-largest in the Midwest after the Chicago metropolitan area. Regarded as a major cultural center, Detroit is known for its contributions to music and as a repository for art and design. Detroit is a major port located on the Detroit River, one of the four major straits that connect the Great Lakes system to the Saint Lawrence Seaway; the Detroit Metropolitan Airport is among the most important hubs in the United States. The City of Detroit anchors the second-largest regional economy in the Midwest, behind Chicago and ahead of Minneapolis–Saint Paul, the 13th-largest in the United States. Detroit and its neighboring Canadian city Windsor are connected through a tunnel and the Ambassador Bridge, the busiest international crossing in North America.
Detroit is best known as the center of the U. S. automobile industry, the "Big Three" auto manufacturers General Motors and Chrysler are all headquartered in Metro Detroit. In 1701, Antoine de la Mothe Cadillac founded Fort Pontchartrain du Détroit, the future city of Detroit. During the 19th century, it became an important industrial hub at the center of the Great Lakes region. With expansion of the auto industry in the early 20th century, the city and its suburbs experienced rapid growth, by the 1940s, the city had become the fourth-largest in the country. However, due to industrial restructuring, the loss of jobs in the auto industry, rapid suburbanization, Detroit lost considerable population from the late 20th century to the present. Since reaching a peak of 1.85 million at the 1950 census, Detroit's population has declined by more than 60 percent. In 2013, Detroit became the largest U. S. city to file for bankruptcy, which it exited in December 2014, when the city government regained control of Detroit's finances.
Detroit's diverse culture has had both local and international influence in music, with the city giving rise to the genres of Motown and techno, playing an important role in the development of jazz, hip-hop and punk music. The erstwhile rapid growth of Detroit left a globally unique stock of architectural monuments and historic places, since the 2000s conservation efforts managed to save many architectural pieces and allowed several large-scale revitalizations, including the restoration of several historic theatres and entertainment venues, high-rise renovations, new sports stadiums, a riverfront revitalization project. More the population of Downtown Detroit, Midtown Detroit, various other neighborhoods has increased. An popular tourist destination, Detroit receives 19 million visitors per year. In 2015, Detroit was named a "City of Design" by UNESCO, the first U. S. city to receive that designation. Paleo-Indian people inhabited areas near Detroit as early as 11,000 years ago including the culture referred to as the Mound-builders.
In the 17th century, the region was inhabited by Huron, Odawa and Iroquois peoples. The first Europeans did not penetrate into the region and reach the straits of Detroit until French missionaries and traders worked their way around the League of the Iroquois, with whom they were at war, other Iroquoian tribes in the 1630s; the north side of Lake Erie was held by the Huron and Neutral peoples until the 1650s, when the Iroquois pushed both and the Erie people away from the lake and its beaver-rich feeder streams in the Beaver Wars of 1649–1655. By the 1670s, the war-weakened Iroquois laid claim to as far south as the Ohio River valley in northern Kentucky as hunting grounds, had absorbed many other Iroquoian peoples after defeating them in war. For the next hundred years no British, colonist, or French action was contemplated without consultation with, or consideration of the Iroquois' response; when the French and Indian War evicted the Kingdom of France from Canada, it removed one barrier to British colonists migrating west.
British negotiations with the Iroquois would both prove critical and lead to a Crown policy limiting the west of the Alleghenies settlements below the Great Lakes, which gave many American would-be migrants a casus belli for supporting the American Revolution. The 1778 raids and resultant 1779 decisive Sullivan Expedition reopened the Ohio Country to westward emigration, which began immediately, by 1800 white settlers were pouring westwards; the city was named by French colonists, referring to the Detroit River, linking Lake Huron and Lake Erie. On July 24, 1701, the French explorer Antoine de la Mothe Cadillac, along with more than a hundred other settlers began constructing a small fort on the north bank of the Detroit River. Cadillac would name the settlement Fort Pontchartrain du Détroit, after Louis Phélypeaux, comte de Pontchartrain, Minister of Marine under Louis XIV. France offered free land to colonists to attract families to Detroit. By 1773, the population of Detroit was 1,400. By 1778, its population was up to 2,144 and it was the third-largest city in the Province of Quebec.
The region's economy was based on the lucrative fur trade, in which nume
In economics, cargo or freight refers to goods or produce being conveyed – for commercial gain – by water, air or land. Cargo was a shipload. Cargo now covers all types of freight, including that carried by train, truck, or intermodal container; the term cargo is used in case of goods in the cold-chain, because the perishable inventory is always in transit towards a final end-use when it is held in cold storage or other similar climate-controlled facility. Multi-modal container units, designed as reusable carriers to facilitate unit load handling of the goods contained, are referred to as cargo, specially by shipping lines and logistics operators. Aircraft ULD boxes are documented as cargo, with associated packing list of the items contained within; when empty containers are shipped each unit is documented as a cargo and when goods are stored within, the contents are termed as containerised cargo. Seaport terminals handle a wide range of maritime cargo. Automobiles are handled at many ports and are carried on specialized roll-on/roll-off ships.
Break bulk cargo is material stacked on pallets and lifted into and out of the hold of a vessel by cranes on the dock or aboard the ship itself. The volume of break bulk cargo has declined worldwide as containerization has grown. One way to secure break bulk and freight in intermodal containers is by using Dunnage Bags. Bulk cargo, such as salt, oil and scrap metal, is defined as commodities that are neither on pallets nor in containers. Bulk cargoes are not handled as individual pieces, the way heavy-lift and project cargoes are. Alumina, gypsum and wood chips, for instance, are bulk cargoes. Neo-bulk cargo comprises individual units that are counted as they are loaded and unloaded, in contrast to bulk cargo, not counted, but that are not containerized. Containers are the fastest growing cargo category at most ports worldwide. Containerized cargo includes everything from auto parts and manufacturing components to shoes and toys to frozen meat and seafood. Project cargo and the heavy lift cargo include items like manufacturing equipment, air conditioners, factory components, wind turbines, military equipment, any other oversized or overweight cargo, too big or too heavy to fit into a container.
Air cargo known as air freight, is collected by firms from shippers and delivered to customers. Aircraft were first used for carrying mail as cargo in 1911. Manufacturers started designing aircraft for other types of freight as well. There are many commercial aircraft suitable for carrying cargo such as the Boeing 747 and the bigger An‑124, purposely built for easy conversion into a cargo aircraft; such large aircraft employ quick-loading containers known as unit load devices, much like containerized cargo ships. The ULDs are located in the front section of the aircraft. Most nations own and utilize large numbers of military cargo aircraft such as the C‑17 Globemaster III for logistical needs. Popular commercial aircraft transformed to a cargo aircraft such as Saab 340A is designed for high revenue and profitability in short / medium haul operations. Trains are capable of transporting a large number of containers. Trains are used for the transportation of water, grain, steel and coal, they are used because they can carry a large amount and have a direct route to the destination.
Under the right circumstances, freight transport by rail is more economic and energy efficient than by road when carried in bulk or over long distances. The main disadvantage of rail freight is its lack of flexibility. For this reason, rail has lost much of the freight business to road transport. Rail freight is subject to transshipment costs, since it must be transferred from one mode of transportation to another. Practices such as containerization aim at minimizing these costs; when transporting point-to-point bulk loads such as cement or grain, with specialised bulk handling facilities at the rail sidings, rail mode of transport remains the most convenient and preferred option. Many governments are trying to encourage shippers to use trains more because of the environmental benefits. Many firms, like Parcelforce, R+L Carriers transport all types of cargo by road. Delivering everything from letters to houses to cargo containers, these firms offer fast, sometimes same-day, delivery. A good example of road cargo is food, as supermarkets require deliveries daily to replenish their shelves with goods.
Retailers and manufacturers of all kinds rely upon delivery trucks, be they full size semi trucks or smaller delivery vans. These smaller road haulage companies strive for the best routes and prices to ship out their products. Indeed, the level of commercial freight transported by smaller businesses is a good barometer of healthy economic development as it is these types of vehicles that move and transport anything, including couriers transporting parcel and mail. You can see the different weights of vehicles that are used to move cargo around. Freight is organized into various shipment categories before it is transported. An item's category is determined by: the type of item being carried. For example, a kettle could fit into the category'household goods'. How large the shipment is, in terms of both item size and quantity. How long the item for delivery will be in transit. Shipments are categorized as household goods, express and freight shipments: Household goods include furniture and similar items.
Small business or personal items like envelopes are considered overnight expres
Cleveland is a major city in the U. S. state of Ohio, the county seat of Cuyahoga County. The city proper has a population of 385,525, making it the 51st-largest city in the United States, the second-largest city in Ohio. Greater Cleveland is ranked as the 32nd-largest metropolitan area in the U. S. with 2,055,612 people in 2016. The city anchors the Cleveland–Akron–Canton Combined Statistical Area, which had a population of 3,515,646 in 2010 and is ranked 15th in the United States; the city is located on the southern shore of Lake Erie 60 miles west of the Ohio-Pennsylvania state border. It was founded in 1796 near the mouth of the Cuyahoga River, it became a manufacturing center due to its location on both the river and the lake shore, as well as being connected to numerous canals and railroad lines. Cleveland's economy relies on diversified sectors such as manufacturing, financial services and biomedicals. Cleveland is home to the Rock and Roll Hall of Fame. Cleveland residents are called "Clevelanders".
The city has many nicknames, the oldest of which in contemporary use being "The Forest City". Cleveland was named on July 22, 1796, when surveyors of the Connecticut Land Company laid out Connecticut's Western Reserve into townships and a capital city, they named it "Cleaveland" after General Moses Cleaveland. Cleaveland oversaw design of the plan for what would become the modern downtown area, centered on Public Square, before returning home, never again to visit Ohio; the first settler in Cleaveland was Lorenzo Carter, who built a cabin on the banks of the Cuyahoga River. The Village of Cleaveland was incorporated on December 23, 1814. In spite of the nearby swampy lowlands and harsh winters, its waterfront location proved to be an advantage, giving access to Great Lakes trade; the area began rapid growth after the 1832 completion of the Erie Canal. This key link between the Ohio River and the Great Lakes connected the city to the Atlantic Ocean via the Erie Canal and Hudson River, via the St. Lawrence Seaway.
Its products could reach markets on the Gulf of Mexico via the Mississippi River. Growth continued with added railroad links. Cleveland incorporated as a city in 1836. In 1836, the city located only on the eastern banks of the Cuyahoga River, nearly erupted into open warfare with neighboring Ohio City over a bridge connecting the two. Ohio City remained an independent municipality until its annexation by Cleveland in 1854; the city's prime geographic location as a transportation hub on the Great Lakes has played an important role in its development as a commercial center. Cleveland serves as a destination for iron ore shipped from Minnesota, along with coal transported by rail. In 1870, John D. Rockefeller founded Standard Oil in Cleveland. In 1885, he moved its headquarters to New York City, which had become a center of finance and business. Cleveland emerged in the early 20th century as an important American manufacturing center, its businesses included automotive companies such as Peerless, People's, Jordan and Winton, maker of the first car driven across the U.
S. Other manufacturers located in Cleveland produced steam-powered cars, which included White and Gaeth, as well as the electric car company Baker; because of its significant growth, Cleveland was known as the "Sixth City" of the US during this period. By 1920, due in large part to the city's economic prosperity, Cleveland became the nation's fifth-largest city; the city counted Progressive Era politicians such as the populist Mayor Tom L. Johnson among its leaders, its industrial jobs had attracted waves of European immigrants from southern and eastern Europe, as well as both black and white migrants from the rural South. In commemoration of the centennial of Cleveland's incorporation as a city, the Great Lakes Exposition debuted in June 1936 along the Lake Erie shore north of downtown. Conceived as a way to energize the city after the Great Depression, it drew four million visitors in its first season, seven million by the end of its second and final season in September 1937; the exposition was housed on grounds that are now used by the Great Lakes Science Center, the Rock and Roll Hall of Fame, Burke Lakefront Airport, among others.
Following World War II, Cleveland continued to enjoy a prosperous economy. In sports, the Indians won the 1948 World Series, the hockey team, the Barons, became champions of the American Hockey League, the Browns dominated professional football in the 1950s; as a result, along with track and boxing champions produced, Cleveland was dubbed "City of Champions" in sports at this time. Businesses proclaimed that Cleveland was the "best location in the nation". In 1940, non-Hispanic whites represented 90.2% of Cleveland's population. Wealthy patrons supported development of the city's cultural institutions, such as the art museum and orchestra; the city's population reached its peak of 914,808, in 1949 Cleveland was named an All-America City for the first time. By the 1960s, the economy slowed, residents sought new housing in the suburbs, reflecting the national trends of suburban growth following the subsidized highways. In the 1950s and 1960s, African Americans worked in numerous cities to gain constitutional rights and relief from racial discrimination.
As change lagged despite federal laws to enforce rights and racial unrest occurred in Cleveland and numerous other industrial cities. In Cleveland, the Hough Riots erupted from July 18 to 23, 1966; the Glenville Shootout took place from July 23 to 25, 1968. In November 1967, Cleveland became the first major American city to elect a black mayor, Carl Stokes. Industrial restructuring in the railroad and steel industries, resulted in the loss of numerous
Lake Huron is one of the five Great Lakes of North America. Hydrologically, it comprises the easterly portion of Lake Michigan–Huron, having the same surface elevation as its westerly counterpart, to which it is connected by the 5-mile-wide, 20-fathom-deep Straits of Mackinac, it is shared on the north and east by the Canadian province of Ontario and on the south and west by the state of Michigan in the United States. The name of the lake is derived from early French explorers who named it for the Huron people inhabiting the region; the Huronian glaciation was named due to evidence collected from Lake Huron region. The northern parts of the lake include the North Georgian Bay. Across the lake to the southwest is Saginaw Bay; the main inlet is the St. Marys River, the main outlet is the St. Clair River. By surface area, Lake Huron is the second-largest of the Great Lakes, with a surface area of 23,007 square miles — of which 9,103 square miles lies in Michigan. By volume however, Lake Huron is only the third largest of the Great Lakes, being surpassed by Lake Michigan and Lake Superior.
When measured at the low water datum, the lake contains a volume of 850 cubic miles and a shoreline length of 3,827 mi. The surface of Lake Huron is 577 feet above sea level; the lake's average depth is 32 fathoms 3 feet. It has a greatest breadth of 183 statute miles. Cities with over 10,000 people on Lake Huron include Sarnia, the largest city on Lake Huron, Saugeen Shores in Canada and Bay City, Port Huron, Alpena in the United States. A large bay that protrudes northeast from Lake Huron into Ontario, Canada, is called Georgian Bay. A notable feature of the lake is Manitoulin Island, which separates the North Channel and Georgian Bay from Lake Huron's main body of water, it is the world's largest lake island. Major centres on Georgian Bay include Owen Sound, Wasaga Beach, Midland, Port Severn and Parry Sound. A smaller bay that protrudes southwest from Lake Huron into Michigan is called Saginaw Bay. Historic High Water The lake fluctuates from month to month with the highest lake levels in October and November.
The normal high-water mark is 2.00 feet above datum. In the summer of 1986, Lakes Michigan and Huron reached their highest level at 5.92 feet above datum. The high-water records began in February 1986 and lasted through the year, ending with January 1987. Water levels ranged from 3.67 to 5.92 feet above Chart Datum. Historic Low Water Lake levels tend to be the lowest in winter; the normal low-water mark is 1.00 foot below datum. In the winter of 1964, Lakes Michigan and Huron reached their lowest level at 1.38 feet below datum. As with the high-water records, monthly low-water records were set each month from February 1964 through January 1965. During this twelve-month period, water levels ranged from 1.38 to 0.71 feet below Chart Datum. The Great Lakes Circle Tour is a designated scenic road system connecting all the Great Lakes and the St. Lawrence River. Lake Huron has the largest shore line length of any of the Great Lakes, counting its 30,000 islands. Lake Huron is separated from Lake Michigan, which lies at the same level, by the 5-mile-wide, 20-fathom-deep Straits of Mackinac, making them hydrologically the same body of water.
Aggregated, Lake Huron-Michigan, at 45,300 square miles, "is technically the world's largest freshwater lake." When counted separately, Lake Superior is 8,700 square miles higher. Lake Superior drains into the St. Marys River which flows southward into Lake Huron; the water flows south to the St. Clair River, at Port Huron and Sarnia, Ontario; the Great Lakes Waterway continues thence to Lake St. Clair. Like the other Great Lakes, it was formed by melting ice as the continental glaciers retreated toward the end of the last ice age. Before this, Lake Huron was a low-lying depression through which flowed the now-buried Laurentian and Huronian Rivers; the Alpena-Amberley Ridge is an ancient ridge beneath the surface of Lake Huron, running between Alpena and Point Clark, Ontario. About 9,000 years ago, when water levels in Lake Huron were about 100 m below today's levels, the ridge was exposed and the land bridge was used as a migration route for large herds of caribou. Since 2008, archaeologists have discovered at least 60 stone constructions along the submerged ridge that are thought to have been used as hunting blinds by Paleo-Indians.
The extent of development among Eastern Woodlands Native American societies on the eve of European contact is indicated by the archaeological evidence of a town on or near Lake Huron that contained more than one hundred large structures housing a total population of between 4,000 and 6,000. The French, the first European visitors to the region referred to Lake Huron as La Mer Douce, "the fresh-water sea". In 1656, a map by French cartographer Nicolas Sanson
New York City
The City of New York called either New York City or New York, is the most populous city in the United States. With an estimated 2017 population of 8,622,698 distributed over a land area of about 302.6 square miles, New York is the most densely populated major city in the United States. Located at the southern tip of the state of New York, the city is the center of the New York metropolitan area, the largest metropolitan area in the world by urban landmass and one of the world's most populous megacities, with an estimated 20,320,876 people in its 2017 Metropolitan Statistical Area and 23,876,155 residents in its Combined Statistical Area. A global power city, New York City has been described as the cultural and media capital of the world, exerts a significant impact upon commerce, research, education, tourism, art and sports; the city's fast pace has inspired the term New York minute. Home to the headquarters of the United Nations, New York is an important center for international diplomacy.
Situated on one of the world's largest natural harbors, New York City consists of five boroughs, each of, a separate county of the State of New York. The five boroughs – Brooklyn, Manhattan, The Bronx, Staten Island – were consolidated into a single city in 1898; the city and its metropolitan area constitute the premier gateway for legal immigration to the United States. As many as 800 languages are spoken in New York, making it the most linguistically diverse city in the world. New York City is home to more than 3.2 million residents born outside the United States, the largest foreign-born population of any city in the world. In 2017, the New York metropolitan area produced a gross metropolitan product of US$1.73 trillion. If greater New York City were a sovereign state, it would have the 12th highest GDP in the world. New York is home to the highest number of billionaires of any city in the world. New York City traces its origins to a trading post founded by colonists from the Dutch Republic in 1624 on Lower Manhattan.
The city and its surroundings came under English control in 1664 and were renamed New York after King Charles II of England granted the lands to his brother, the Duke of York. New York served as the capital of the United States from 1785 until 1790, it has been the country's largest city since 1790. The Statue of Liberty greeted millions of immigrants as they came to the U. S. by ship in the late 19th and early 20th centuries and is an international symbol of the U. S. and its ideals of liberty and peace. In the 21st century, New York has emerged as a global node of creativity and entrepreneurship, social tolerance, environmental sustainability, as a symbol of freedom and cultural diversity. Many districts and landmarks in New York City are well known, with the city having three of the world's ten most visited tourist attractions in 2013 and receiving a record 62.8 million tourists in 2017. Several sources have ranked New York the most photographed city in the world. Times Square, iconic as the world's "heart" and its "Crossroads", is the brightly illuminated hub of the Broadway Theater District, one of the world's busiest pedestrian intersections, a major center of the world's entertainment industry.
The names of many of the city's landmarks and parks are known around the world. Manhattan's real estate market is among the most expensive in the world. New York is home to the largest ethnic Chinese population outside of Asia, with multiple signature Chinatowns developing across the city. Providing continuous 24/7 service, the New York City Subway is the largest single-operator rapid transit system worldwide, with 472 rail stations. Over 120 colleges and universities are located in New York City, including Columbia University, New York University, Rockefeller University, which have been ranked among the top universities in the world. Anchored by Wall Street in the Financial District of Lower Manhattan, New York has been called both the most economically powerful city and the leading financial center of the world, the city is home to the world's two largest stock exchanges by total market capitalization, the New York Stock Exchange and NASDAQ. In 1664, the city was named in honor of the Duke of York.
James's older brother, King Charles II, had appointed the Duke proprietor of the former territory of New Netherland, including the city of New Amsterdam, which England had seized from the Dutch. During the Wisconsinan glaciation, 75,000 to 11,000 years ago, the New York City region was situated at the edge of a large ice sheet over 1,000 feet in depth; the erosive forward movement of the ice contributed to the separation of what is now Long Island and Staten Island. That action left bedrock at a shallow depth, providing a solid foundation for most of Manhattan's skyscrapers. In the precolonial era, the area of present-day New York City was inhabited by Algonquian Native Americans, including the Lenape, whose homeland, known as Lenapehoking, included Staten Island; the first documented visit into New York Harbor by a European was in 1524 by Giovanni da Verrazzano, a Florentine explorer in the service of the French crown. He named it Nouvelle Angoulême. A Spanish expedition led by captain Estêvão Gomes, a Portuguese sailing for Emperor Charles V, arrived in New York Harbor in January 1525 and charted the mouth of the Hudson River, which he named Río de San Antonio.
The Padrón Rea
The Mesabi Iron Range is an elongate trend containing large deposits of iron ore, the largest of four major iron ranges in the region collectively known as the Iron Range of Minnesota. Discovered in 1866, it is the chief iron ore mining district in the United States; the district is located in northeast Minnesota in Itasca and Saint Louis counties. It was extensively worked in the earlier part of the 20th century. Extraction operations declined throughout the mid-1970s but rebounded in 2005. China's growing demand for iron, along with the falling value of the U. S. dollar versus other world currencies, have made taconite production profitable again, some mines that had closed have been reopened, while current mines have been expanded. The Mesabi Range was known to the local Ojibwe as Misaabe-wajiw. Throughout the Mesabi Range, "Mesaba" and "Missabe" spelling variations are found along with places containing "Giant" in their names. There are three iron ranges in northern Minnesota, the Cuyuna, the Vermilion, the Mesabi.
Most of the world's iron ore, including that contained in northern Minnesota, was formed during the middle Precambrian. During this period, erosion leveled mountains; this erosion released iron and silica into the waters of a new sea. Marine algae living in this new sea raised the level of atmospheric oxygen; this oxygen catastrophe caused the eroded iron to precipitate into the banded iron formations found in northern Minnesota and other members of the Animikie Group. Over billions of years, geological forces left behind ore deposits of varied quality and concentrations – differences that would determine how the ore was mined from place to place. On the Mesabi Range, stretching 100 miles from Grand Rapids to Babbitt, soft ore lay close to the surface, where it could be scooped from open pit mines; the overall structure of the range is that of a monocline dipping 5 to 15 degrees to the southeast. Key faults include the Calumet, La Rue, Morton and the Siphon; the Duluth Gabbro complex to the east has caused metamorphic changes in the Biwabik formation.
The natural iron ores and the magnetite taconites occur in this Precambrian Biwabik formation, a cherty layer 340–750 feet thick. The natural ores are located in elongated channels or tabular deposits, while the magnetite taconites occur in stratigraphic zones. Natural ores have an iron content of 51 to 57 per cent while the pellets contain 60 to 67 per cent; the natural ores are mixtures of hematite and goethite. The most common silicate is Minnesotaite. Of note are the presence of algal structures in the Biwabik formation; the Mesabi Range is 110 miles long. Heights vary from 200–500 feet; the highest point, located about 5.6 miles northeast of Virginia, is Pike Mountain at 1,950 feet. The range trends from the northeast to the southwest, extending from Babbitt to Grand Rapids; the Embarrass Mountains are a small subrange of the Mesabi Range, spanning about 9 miles through northern White Township and Hoyt Lakes in St. Louis County. Heights vary from 200–400 feet; the highest point, at 1,940 feet, is 1.9 miles west of the unincorporated community of Hinsdale, near the former Erie Mining Company's pits and taconite processing plant.
Iron-bearing rocks were noted by the Minnesota State Geologist Henry H. Eames in 1866. Iron ore was discovered north of Mountain Iron, Minnesota on 16 Nov. 1890 by J. A. Nichols of the Merritt brothers; the range was defined by 1900. Underground mines were employed but these gave way to open pits so that by 1902, half the operations were conducted this way; the last underground mine closed in 1960. Natural ores gave way to iron-ore concentrates from magnetite taconite so that by 1965 one third of production came from these pellets. Iron ore is mined only from open pits, although some mines operated underground early on. Much of the softer ore was formed close to the surface, allowing mining operations to be conducted via open pit mines; the world's largest open pit iron ore mine is the Hull–Rust–Mahoning Open Pit Iron Mine in Hibbing. In the early years of mining from the late 19th century until the 1950s, mining focus was on high grade ore that could be processed into steel without much change. However, when that supply dried up, focus shifted to lower-grade ore which requires extensive processing at large mining-processing facilities before moving to port.
The mined ore is transported by the Duluth and Iron Range Railway, to the ports of Two Harbors and Duluth. At Duluth, trains of up to eighty 100-ton open cars are moved out on massive ore docks to be dumped into "lakers" of up to 60,000 tons weight for movement to steel mills in Indiana and Ohio. Open pit mines that are no longer worked are a common feature along the Iron Range; some of these sites have been redeveloped for other uses. For instance, the Virginia Pilot is a project which focuses on redeveloping the grounds adjacent to the old mines into low- to moderate-income residential space; the Hill-Annex Mine is now a state park and offers tours to visitors who wish to learn about mine operations. Tours are guided by former mine workers. There are six mining-processing facilities in operation on the Iron Range. Cliffs Natural Resources owns and operates Northshore Mining, which has mining operations in Babbitt and crushing and pelletizing operations in Silver Bay, along with United Taconite which has mining operations in Eveleth and crushing and pelletizing operations in Forbes.
Arcelor Mittal owns and operates the Minorca Mine and Plant with mining operations near Biwabik and Gilbert and a crushing and pelletizing fa
A river is a natural flowing watercourse freshwater, flowing towards an ocean, lake or another river. In some cases a river flows into the ground and becomes dry at the end of its course without reaching another body of water. Small rivers can be referred to using names such as stream, brook and rill. There are no official definitions for the generic term river as applied to geographic features, although in some countries or communities a stream is defined by its size. Many names for small rivers are specific to geographic location. Sometimes a river is defined as being larger than a creek, but not always: the language is vague. Rivers are part of the hydrological cycle. Potamology is the scientific study of rivers, while limnology is the study of inland waters in general. Most of the major cities of the world are situated on the banks of rivers, as they are, or were, used as a source of water, for obtaining food, for transport, as borders, as a defensive measure, as a source of hydropower to drive machinery, for bathing, as a means of disposing of waste.
A river begins at a source, follows a path called a course, ends at a mouth or mouths. The water in a river is confined to a channel, made up of a stream bed between banks. In larger rivers there is also a wider floodplain shaped by flood-waters over-topping the channel. Floodplains may be wide in relation to the size of the river channel; this distinction between river channel and floodplain can be blurred in urban areas where the floodplain of a river channel can become developed by housing and industry. Rivers can flow down mountains, through valleys or along plains, can create canyons or gorges; the term upriver refers to the direction towards the source of the river, i.e. against the direction of flow. The term downriver describes the direction towards the mouth of the river, in which the current flows; the term left bank refers to the left bank in the direction of right bank to the right. The river channel contains a single stream of water, but some rivers flow as several interconnecting streams of water, producing a braided river.
Extensive braided rivers are now found in only a few regions worldwide, such as the South Island of New Zealand. They occur on peneplains and some of the larger river deltas. Anastamosing rivers are quite rare, they have multiple sinuous channels carrying large volumes of sediment. There are rare cases of river bifurcation in which a river divides and the resultant flows ending in different seas. An example is the bifurcation of Nerodime River in Kosovo. A river flowing in its channel is a source of energy which acts on the river channel to change its shape and form. In 1757, the German hydrologist Albert Brahms empirically observed that the submerged weight of objects that may be carried away by a river is proportional to the sixth power of the river flow speed; this formulation is sometimes called Airy's law. Thus, if the speed of flow is doubled, the flow would dislodge objects with 64 times as much submerged weight. In mountainous torrential zones this can be seen as erosion channels through hard rocks and the creation of sands and gravels from the destruction of larger rocks.
A river valley, created from a U-shaped glaciated valley, can easily be identified by the V-shaped channel that it has carved. In the middle reaches where a river flows over flatter land, meanders may form through erosion of the river banks and deposition on the inside of bends. Sometimes the river will cut off a loop, shortening the channel and forming an oxbow lake or billabong. Rivers that carry large amounts of sediment may develop conspicuous deltas at their mouths. Rivers whose mouths are in saline tidal waters may form estuaries. Throughout the course of the river, the total volume of water transported downstream will be a combination of the free water flow together with a substantial volume flowing through sub-surface rocks and gravels that underlie the river and its floodplain. For many rivers in large valleys, this unseen component of flow may exceed the visible flow. Most but not all rivers flow on the surface. Subterranean rivers flow underground in caverns; such rivers are found in regions with limestone geologic formations.
Subglacial streams are the braided rivers that flow at the beds of glaciers and ice sheets, permitting meltwater to be discharged at the front of the glacier. Because of the gradient in pressure due to the overlying weight of the glacier, such streams can flow uphill. An intermittent river only flows and can be dry for several years at a time; these rivers are found in regions with limited or variable rainfall, or can occur because of geologic conditions such as a permeable river bed. Some ephemeral rivers flow during the summer months but not in the winter; such rivers are fed from chalk aquifers which recharge from winter rainfall. In England these rivers are called bournes and give their name to places such as Bournemouth and Eastbourne. In humid regions, the location where flow begins in the smallest tributary streams moves upstream in response to precipitation and downstream in its absence or when active summer vegetation diverts water for evapotrans