Argentina the Argentine Republic, is a country located in the southern half of South America. Sharing the bulk of the Southern Cone with Chile to the west, the country is bordered by Bolivia and Paraguay to the north, Brazil to the northeast and the South Atlantic Ocean to the east, the Drake Passage to the south. With a mainland area of 2,780,400 km2, Argentina is the eighth-largest country in the world, the fourth largest in the Americas, the largest Spanish-speaking nation; the sovereign state is subdivided into twenty-three provinces and one autonomous city, Buenos Aires, the federal capital of the nation as decided by Congress. The provinces and the capital exist under a federal system. Argentina claims sovereignty over part of Antarctica, the Falkland Islands, South Georgia and the South Sandwich Islands; the earliest recorded human presence in modern-day Argentina dates back to the Paleolithic period. The Inca Empire expanded to the northwest of the country in Pre-Columbian times; the country has its roots in Spanish colonization of the region during the 16th century.
Argentina rose as the successor state of the Viceroyalty of the Río de la Plata, a Spanish overseas viceroyalty founded in 1776. The declaration and fight for independence was followed by an extended civil war that lasted until 1861, culminating in the country's reorganization as a federation of provinces with Buenos Aires as its capital city; the country thereafter enjoyed relative peace and stability, with several waves of European immigration radically reshaping its cultural and demographic outlook. The almost-unparalleled increase in prosperity led to Argentina becoming the seventh wealthiest nation in the world by the early 20th century. Following the Great Depression in the 1930s, Argentina descended into political instability and economic decline that pushed it back into underdevelopment, though it remained among the fifteen richest countries for several decades. Following the death of President Juan Perón in 1974, his widow, Isabel Martínez de Perón, ascended to the presidency, she was overthrown in 1976 by a U.
S.-backed coup which installed a right-wing military dictatorship. The military government persecuted and murdered numerous political critics and leftists in the Dirty War, a period of state terrorism that lasted until the election of Raúl Alfonsín as President in 1983. Several of the junta's leaders were convicted of their crimes and sentenced to imprisonment. Argentina is a prominent regional power in the Southern Cone and Latin America, retains its historic status as a middle power in international affairs. Argentina has the second largest economy in South America, the third-largest in Latin America, membership in the G-15 and G-20 major economies, it is a founding member of the United Nations, World Bank, World Trade Organization, Union of South American Nations, Community of Latin American and Caribbean States and the Organization of Ibero-American States. Despite its history of economic instability, it ranks second highest in the Human Development Index in Latin America; the description of the country by the word Argentina has been found on a Venetian map in 1536.
In English the name "Argentina" comes from the Spanish language, however the naming itself is not Spanish, but Italian. Argentina means in Italian " of silver, silver coloured" borrowed from the Old French adjective argentine " of silver" > "silver coloured" mentioned in the 12th century. The French word argentine is the feminine form of argentin and derives from argent "silver" with the suffix -in; the Italian naming "Argentina" for the country implies Terra Argentina "land of silver" or Costa Argentina "coast of silver". In Italian, the adjective or the proper noun is used in an autonomous way as a substantive and replaces it and it is said l'Argentina; the name Argentina was first given by the Venetian and Genoese navigators, such as Giovanni Caboto. In Spanish and Portuguese, the words for "silver" are plata and prata and " of silver" is said plateado and prateado. Argentina was first associated with the silver mountains legend, widespread among the first European explorers of the La Plata Basin.
The first written use of the name in Spanish can be traced to La Argentina, a 1602 poem by Martín del Barco Centenera describing the region. Although "Argentina" was in common usage by the 18th century, the country was formally named "Viceroyalty of the Río de la Plata" by the Spanish Empire, "United Provinces of the Río de la Plata" after independence; the 1826 constitution included the first use of the name "Argentine Republic" in legal documents. The name "Argentine Confederation" was commonly used and was formalized in the Argentine Constitution of 1853. In 1860 a presidential decree settled the country's name as "Argentine Republic", that year's constitutional amendment ruled all the names since 1810 as valid. In the English language the country was traditionally called "the Argentine", mimicking the typical Spanish usage la Argentina and resulting from a mistaken shortening of the fuller name'Argentine Republic'.'The Argentine' fell out of fashion during the mid-to-late 20th century, now the country is referred to as "Argentina".
In the Spanish language "Argentina" is feminine, taking the feminine article "La" as the i
Córdoba Province, Argentina
Córdoba is a province of Argentina, located in the center of the country. Neighboring provinces are: Santiago del Estero, Santa Fe, Buenos Aires, La Pampa, San Luis, La Rioja and Catamarca. Together with Santa Fe and Entre Ríos, the province is part of the economic and political association known as the Center Region. Córdoba is the second most populous Argentine province, with 3,308,876 inhabitants, the fifth by size, at about 165,321 km2. 41% of its inhabitants reside in the capital city, Córdoba, its surroundings, making it the second most populous metro area in Argentina. Before the Spanish conquista the region now called Córdoba Province was inhabited by indigenous groups, most notably the Comechingones and Sanavirones. Once settled in Alto Perú, the Spaniards searched for a route to the Río de la Plata port in the Atlantic Ocean to transport the Peruvian gold and silver to Europe. Córdoba de la Nueva Andalucía was founded as a middle point on that route on July 6, 1573 by Jerónimo Luis de Cabrera.
The Colegio Convictorio de Nuestra Señora de Monserrat was founded by the Jesuits in 1599, followed by the National University of Córdoba, Argentina's first university, in 1613. The city continued to grow as an important cultural center, supported by the trade of precious metals from Peru. In 1761 a printing press was installed in the University. In 1783, seven years after the consolidation of the Viceroyalty of the Río de la Plata, the Intendency of Córdoba became the capital of what now includes the La Rioja, San Juan and San Luis Province, dividing the former Tucumán Intendency in two. Rafael de Sobremonte was its first governor. After the May Revolution in 1810, Governor Juan Gutiérrez de la Concha joined a meeting that decided to ignore the authority of the Buenos Aires Junta. Francisco Ortiz de Ocampo attacked the city and executed the leaders of the opposition, among whom was Santiago de Liniers, leader of the resistance during the British invasions of the Río de la Plata. Led by Juan Bautista Bustos after 1820, Córdoba struggled for control of the Nation with Buenos Aires.
Córdoba sought a federal organization of the provinces while Rivadavia pushed for a centralised government in Buenos Aires. For 15 years the province was submerged in internal revolts that started to stabilize in 1868 under the provisional government of Félix de la Peña. During the presidency of Sarmiento an astronomic observatory and the Faculty of Physical Sciences and Mathematics were inaugurated; the creation of the railways and the consequent immigration brought a second wave of population growth to Córdoba. From 1887 on, several agricultural colonies emerged, while former rest-point Fraile Muerto and Los Luceros, on the route to Buenos Aires, became agricultural and industrial centers, respectively; the University Reform movement, which originated in Córdoba in 1918, was influential not only in Argentina but throughout South America. Modernization of the curricular contents and the improvement of the students' rights were the main achievements of the movement and in Córdoba, were enacted by Governor Amadeo Sabattini, who became Argentina's most progressive governor at the time and enacted civil and land reforms that would set the national standard.
After World War II, many foreign workers and workers from other provinces in Argentina were seduced by Córdoba's industrial development, led by the expansion of the car industry. It was during Arturo Frondizi's presidency that most new auto industries settled in the city of Córdoba and its surroundings; as in the rest of the country, Peronist groups emerged in 1955 following the coup that removed Juan Perón from office. These Peronist groups, together with other socialist and anarchist groups, began opposing Argentina's third military dictatorship that began in 1966. Worker and student participation in politics grew due to the widespread discontent with the appointed governor's hard-line stance, culminating in the violent May, 1969, popular revolt known as the Cordobazo; this revolt, mirrored by the Rosariazo and others in several parts of the country, undermined the power of dictator Juan Carlos Onganía and led to his ouster by more moderate military factions. Córdoba has continued to prosper, despite left-wing violence in 1973, right-wing political interference in 1974, government atrocities in 1976–77, 1978–81 free trade policies that battered Córdoba's sizable industrial sector, the 1980s debt crisis and, the recent acute financial crisis that ended in 2002.
Córdoba, located just north of the geographical center of the nation, is Argentina's fifth largest province. The main feature of the province is the presence of an extensive plain covering the eastern two thirds of the province, the existence of three major mountain ranges which, are known as Sierras de Córdoba: the easternmost range starts just west of the city of Córdoba and reaches altitudes of around 1,000 meters in the southern portion, over 1,500 meters further north, with a maximum altitude of 1,950 meters at Cerro Uritorco. West of this chain, two valleys contain most of the tourist spots in the province: the Calamuchita valley in the south, the Punilla Valley in the north, home of scenic towns such as Villa Carlos Paz, Cosquín, La Cumbre and La Falda. West of these valleys, the Sierras Grandes form the highest chain in the province: their altitude increases to form a plateau of 2,000 to 2,300 meters
Salt pan (geology)
Natural salt pans or salt flats are flat expanses of ground covered with salt and other minerals shining white under the sun. They are found in deserts, are natural formations. A salt pond; this happens in climates where the rate of water evaporation exceeds the rate of precipitation, that is, in a desert. If the water cannot drain into the ground, it remains on the surface until it evaporates, leaving behind minerals precipitated from the salt ions dissolved in the water. Over thousands of years, the minerals accumulate on the surface; these minerals reflect the sun's rays and appear as white areas. Salt pans can be dangerous; the crust of salt can conceal a quagmire of mud. The Qattara Depression in the eastern Sahara Desert contains many such traps which served as strategic barriers during World War II; the Bonneville Salt Flats in Utah, where many land speed records have been set, are a well-known salt pan in the arid regions of the western United States. The Etosha pan, in the Etosha National Park in Namibia, is another prominent example of a salt pan.
The Salar de Uyuni in Bolivia is the largest salt pan in the world. It contains 50%-70% of the world's lithium reserves. Dry lake – A basin or depression that contained a standing surface water body Sabkha Salt evaporation pond Salt lake Sink – Depression within an endorheic basin where water collects with no visible outlet Solonchak Briere, Peter R.. "Playa, playa lake, sabkha: Proposed definitions for old terms". Journal of Arid Environments. Elsevier. 45: 1–7. Bibcode:2000JArEn..45....1B. Doi:10.1006/jare.2000.0633. Lowenstein, Tim K.. "Criteria for the recognition of salt-pan evaporites". Sedimentation. 32: 627–644. Bibcode:1985Sedim..32..627L. Doi:10.1111/j.1365-3091.1985.tb00478.x
Salinas Grandes (Jujuy and Salta)
The Salinas Grandes are located in the north west part of Argentina, in the provinces of Jujuy and Salta, at an average altitude of 3450 meters above sea level. It covers an area of 212 km2, it is of industrial importance for its potassium mines. Salinas Grandes has been explored for the lithium brine beneath its salt
Altitude or height is defined based on the context in which it is used. As a general definition, altitude is a distance measurement in the vertical or "up" direction, between a reference datum and a point or object; the reference datum often varies according to the context. Although the term altitude is used to mean the height above sea level of a location, in geography the term elevation is preferred for this usage. Vertical distance measurements in the "down" direction are referred to as depth. In aviation, the term altitude can have several meanings, is always qualified by explicitly adding a modifier, or implicitly through the context of the communication. Parties exchanging altitude information must be clear. Aviation altitude is measured using either mean sea level or local ground level as the reference datum. Pressure altitude divided by 100 feet is the flight level, is used above the transition altitude; when flying at a flight level, the altimeter is always set to standard pressure. On the flight deck, the definitive instrument for measuring altitude is the pressure altimeter, an aneroid barometer with a front face indicating distance instead of atmospheric pressure.
There are several types of altitude in aviation: Indicated altitude is the reading on the altimeter when it is set to the local barometric pressure at mean sea level. In UK aviation radiotelephony usage, the vertical distance of a level, a point or an object considered as a point, measured from mean sea level. Absolute altitude is the vertical distance of the aircraft above the terrain over which it is flying, it can be measured using a radar altimeter. Referred to as "radar height" or feet/metres above ground level. True altitude is the actual elevation above mean sea level, it is indicated altitude corrected for non-standard pressure. Height is the vertical distance above a reference point the terrain elevation. In UK aviation radiotelephony usage, the vertical distance of a level, a point or an object considered as a point, measured from a specified datum. Pressure altitude is used to indicate "flight level", the standard for altitude reporting in the U. S. in Class A airspace. Pressure altitude and indicated altitude are the same when the altimeter setting is 29.92" Hg or 1013.25 millibars.
Density altitude is the altitude corrected for non-ISA International Standard Atmosphere atmospheric conditions. Aircraft performance depends on density altitude, affected by barometric pressure and temperature. On a hot day, density altitude at an airport may be so high as to preclude takeoff for helicopters or a loaded aircraft; these types of altitude can be explained more as various ways of measuring the altitude: Indicated altitude – the altitude shown on the altimeter. Absolute altitude – altitude in terms of the distance above the ground directly below True altitude – altitude in terms of elevation above sea level Height – vertical distance above a certain point Pressure altitude – the air pressure in terms of altitude in the International Standard Atmosphere Density altitude – the density of the air in terms of altitude in the International Standard Atmosphere in the air The Earth's atmosphere is divided into several altitude regions; these regions finish at varying heights depending on season and distance from the poles.
The altitudes stated below are averages: Troposphere: surface to 8,000 metres at the poles, 18,000 metres at the Equator, ending at the Tropopause Stratosphere: Troposphere to 50 kilometres Mesosphere: Stratosphere to 85 kilometres Thermosphere: Mesosphere to 675 kilometres Exosphere: Thermosphere to 10,000 kilometres The Kármán line, at an altitude of 100 kilometres above sea level, by convention defines represents the demarcation between the atmosphere and space. The thermosphere and exosphere are regions of the atmosphere that are conventionally defined as space. Regions on the Earth's surface that are high above mean sea level are referred to as high altitude. High altitude is sometimes defined to begin at 2,400 meters above sea level. At high altitude, atmospheric pressure is lower than; this is due to two competing physical effects: gravity, which causes the air to be as close as possible to the ground. The temperature profile of the atmosphere is a result of an interaction between radiation and convection.
Sunlight in the visible spectrum heats it. The ground heats the air at the surface. If radiation were the only way to transfer heat from the ground to space, the greenhouse effect of gases in the atmosphere would keep the ground at 333 K, the temperature would decay exponentially with heigh
Mean sea level is an average level of the surface of one or more of Earth's oceans from which heights such as elevation may be measured. MSL is a type of vertical datum – a standardised geodetic datum –, used, for example, as a chart datum in cartography and marine navigation, or, in aviation, as the standard sea level at which atmospheric pressure is measured to calibrate altitude and aircraft flight levels. A common and straightforward mean sea-level standard is the midpoint between a mean low and mean high tide at a particular location. Sea levels can be affected by many factors and are known to have varied over geological time scales; however 20th century and current millennium sea level rise is caused by global warming, careful measurement of variations in MSL can offer insights into ongoing climate change. The term above sea level refers to above mean sea level. Precise determination of a "mean sea level" is difficult to achieve because of the many factors that affect sea level. Instantaneous sea level varies quite a lot on several scales of space.
This is because the sea is in constant motion, affected by the tides, atmospheric pressure, local gravitational differences, salinity and so forth. The easiest way this may be calculated is by selecting a location and calculating the mean sea level at that point and use it as a datum. For example, a period of 19 years of hourly level observations may be averaged and used to determine the mean sea level at some measurement point. Still-water level or still-water sea level is the level of the sea with motions such as wind waves averaged out. MSL implies the SWL further averaged over a period of time such that changes due to, e.g. the tides have zero mean. Global MSL refers to a spatial average over the entire ocean. One measures the values of MSL in respect to the land. In the UK, the Ordnance Datum is the mean sea level measured at Newlyn in Cornwall between 1915 and 1921. Prior to 1921, the vertical datum was MSL at the Victoria Liverpool. Since the times of the Russian Empire, in Russia and other former its parts, now independent states, the sea level is measured from the zero level of Kronstadt Sea-Gauge.
In Hong Kong, "mPD" is a surveying term meaning "metres above Principal Datum" and refers to height of 1.230m below the average sea level. In France, the Marégraphe in Marseilles measures continuously the sea level since 1883 and offers the longest collapsed data about the sea level, it is used for main part of Africa as official sea level. As for Spain, the reference to measure heights below or above sea level is placed in Alicante. Elsewhere in Europe vertical elevation references are made to the Amsterdam Peil elevation, which dates back to the 1690s. Satellite altimeters have been making precise measurements of sea level since the launch of TOPEX/Poseidon in 1992. A joint mission of NASA and CNES, TOPEX/Poseidon was followed by Jason-1 in 2001 and the Ocean Surface Topography Mission on the Jason-2 satellite in 2008. Height above mean sea level is the elevation or altitude of an object, relative to the average sea level datum, it is used in aviation, where some heights are recorded and reported with respect to mean sea level, in the atmospheric sciences, land surveying.
An alternative is to base height measurements on an ellipsoid of the entire Earth, what systems such as GPS do. In aviation, the ellipsoid known as World Geodetic System 84 is used to define heights; the alternative is to use a geoid-based vertical datum such as NAVD88. When referring to geographic features such as mountains on a topographic map, variations in elevation are shown by contour lines; the elevation of a mountain denotes the highest point or summit and is illustrated as a small circle on a topographic map with the AMSL height shown in metres, feet or both. In the rare case that a location is below sea level, the elevation AMSL is negative. For one such case, see Amsterdam Airport Schiphol. To extend this definition far from the sea means comparing the local height of the mean sea surface with a "level" reference surface, or geodetic datum, called the geoid. In a state of rest or absence of external forces, the mean sea level would coincide with this geoid surface, being an equipotential surface of the Earth's gravitational field.
In reality, due to currents, air pressure variations and salinity variations, etc. this does not occur, not as a long-term average. The location-dependent, but persistent in time, separation between mean sea level and the geoid is referred to as ocean surface topography, it varies globally in a range of ± 2 m. Adjustments were made to sea-level measurements to take into account the effects of the 235 lunar month Metonic cycle and the 223-month eclipse cycle on the tides. Several terms are used to describe the changing relationships between sea level and dry land; when the term "relative" is used, it means change relative to a fixed point in the sediment pile. The term "eustatic" refers to global changes in sea level relative to a fixed point, such as the centre of the earth, for example as a result of melting ice-caps; the term "steric" refers to global changes in sea level due to thermal expansion and salinity variations. The term "isostatic" refers to changes in
Geographic coordinate system
A geographic coordinate system is a coordinate system that enables every location on Earth to be specified by a set of numbers, letters or symbols. The coordinates are chosen such that one of the numbers represents a vertical position and two or three of the numbers represent a horizontal position. A common choice of coordinates is latitude and elevation. To specify a location on a plane requires a map projection; the invention of a geographic coordinate system is credited to Eratosthenes of Cyrene, who composed his now-lost Geography at the Library of Alexandria in the 3rd century BC. A century Hipparchus of Nicaea improved on this system by determining latitude from stellar measurements rather than solar altitude and determining longitude by timings of lunar eclipses, rather than dead reckoning. In the 1st or 2nd century, Marinus of Tyre compiled an extensive gazetteer and mathematically-plotted world map using coordinates measured east from a prime meridian at the westernmost known land, designated the Fortunate Isles, off the coast of western Africa around the Canary or Cape Verde Islands, measured north or south of the island of Rhodes off Asia Minor.
Ptolemy credited him with the full adoption of longitude and latitude, rather than measuring latitude in terms of the length of the midsummer day. Ptolemy's 2nd-century Geography used the same prime meridian but measured latitude from the Equator instead. After their work was translated into Arabic in the 9th century, Al-Khwārizmī's Book of the Description of the Earth corrected Marinus' and Ptolemy's errors regarding the length of the Mediterranean Sea, causing medieval Arabic cartography to use a prime meridian around 10° east of Ptolemy's line. Mathematical cartography resumed in Europe following Maximus Planudes' recovery of Ptolemy's text a little before 1300. In 1884, the United States hosted the International Meridian Conference, attended by representatives from twenty-five nations. Twenty-two of them agreed to adopt the longitude of the Royal Observatory in Greenwich, England as the zero-reference line; the Dominican Republic voted against the motion, while Brazil abstained. France adopted Greenwich Mean Time in place of local determinations by the Paris Observatory in 1911.
In order to be unambiguous about the direction of "vertical" and the "horizontal" surface above which they are measuring, map-makers choose a reference ellipsoid with a given origin and orientation that best fits their need for the area they are mapping. They choose the most appropriate mapping of the spherical coordinate system onto that ellipsoid, called a terrestrial reference system or geodetic datum. Datums may be global, meaning that they represent the whole Earth, or they may be local, meaning that they represent an ellipsoid best-fit to only a portion of the Earth. Points on the Earth's surface move relative to each other due to continental plate motion and diurnal Earth tidal movement caused by the Moon and the Sun; this daily movement can be as much as a metre. Continental movement can be up to 10 m in a century. A weather system high-pressure area can cause a sinking of 5 mm. Scandinavia is rising by 1 cm a year as a result of the melting of the ice sheets of the last ice age, but neighbouring Scotland is rising by only 0.2 cm.
These changes are insignificant if a local datum is used, but are statistically significant if a global datum is used. Examples of global datums include World Geodetic System, the default datum used for the Global Positioning System, the International Terrestrial Reference Frame, used for estimating continental drift and crustal deformation; the distance to Earth's center can be used both for deep positions and for positions in space. Local datums chosen by a national cartographical organisation include the North American Datum, the European ED50, the British OSGB36. Given a location, the datum provides the latitude ϕ and longitude λ. In the United Kingdom there are three common latitude and height systems in use. WGS 84 differs at Greenwich from the one used on published maps OSGB36 by 112 m; the military system ED50, used by NATO, differs from about 120 m to 180 m. The latitude and longitude on a map made against a local datum may not be the same as one obtained from a GPS receiver. Coordinates from the mapping system can sometimes be changed into another datum using a simple translation.
For example, to convert from ETRF89 to the Irish Grid add 49 metres to the east, subtract 23.4 metres from the north. More one datum is changed into any other datum using a process called Helmert transformations; this involves converting the spherical coordinates into Cartesian coordinates and applying a seven parameter transformation, converting back. In popular GIS software, data projected in latitude/longitude is represented as a Geographic Coordinate System. For example, data in latitude/longitude if the datum is the North American Datum of 1983 is denoted by'GCS North American 1983'; the "latitude" of a point on Earth's surface is the angle between the equatorial plane and the straight line that passes through that point and through the center of the Earth. Lines joining points of the same latitude trace circles on the surface of Earth called parallels, as they are parallel to the Equator and to each other; the North Pole is 90° N. The 0° parallel of latitude is designated the Equator, the fun