1.
Geographic coordinate system
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A geographic coordinate system is a coordinate system used in geography 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. A common choice of coordinates is latitude, longitude and elevation, to specify a location on a two-dimensional map requires a map projection. The invention of a coordinate system is generally credited to Eratosthenes of Cyrene. Ptolemy credited him with the adoption of longitude and latitude. Ptolemys 2nd-century Geography used the prime meridian but measured latitude from the equator instead. Mathematical cartography resumed in Europe following Maximus Planudes recovery of Ptolemys 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, the Dominican Republic voted against the motion, while France and Brazil abstained. France adopted Greenwich Mean Time in place of local determinations by the Paris Observatory in 1911, the latitude of a point on Earths 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, the north pole is 90° N, the south pole is 90° S. The 0° parallel of latitude is designated the equator, the plane of all geographic coordinate systems. The equator divides the globe into Northern and Southern Hemispheres, the longitude of a point on Earths surface is the angle east or west of a reference meridian to another meridian that passes through that point. All meridians are halves of great ellipses, which converge at the north and south poles, the prime meridian determines the proper Eastern and Western Hemispheres, although maps often divide these hemispheres further west in order to keep the Old World on a single side. The antipodal meridian of Greenwich is both 180°W and 180°E, the combination of these two components specifies the position of any location on the surface of Earth, without consideration of altitude or depth. The grid formed by lines of latitude and longitude is known as a graticule, the origin/zero point of this system is located in the Gulf of Guinea about 625 km south of Tema, Ghana. To completely specify a location of a feature on, in, or above Earth. Earth is not a sphere, but a shape approximating a biaxial ellipsoid. It is nearly spherical, but has an equatorial bulge making the radius at the equator about 0. 3% larger than the radius measured through the poles, the shorter axis approximately coincides with the axis of rotation
2.
South Africa
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South Africa, officially the Republic of South Africa, is the southernmost country in Africa. South Africa is the 25th-largest country in the world by land area and it is the southernmost country on the mainland of the Old World or the Eastern Hemisphere. About 80 percent of South Africans are of Sub-Saharan African ancestry, divided among a variety of ethnic groups speaking different Bantu languages, the remaining population consists of Africas largest communities of European, Asian, and multiracial ancestry. South Africa is a multiethnic society encompassing a variety of cultures, languages. Its pluralistic makeup is reflected in the recognition of 11 official languages. The country is one of the few in Africa never to have had a coup détat, however, the vast majority of black South Africans were not enfranchised until 1994. During the 20th century, the black majority sought to recover its rights from the dominant white minority, with this struggle playing a role in the countrys recent history. The National Party imposed apartheid in 1948, institutionalising previous racial segregation, since 1994, all ethnic and linguistic groups have held political representation in the countrys democracy, which comprises a parliamentary republic and nine provinces. South Africa is often referred to as the Rainbow Nation to describe the multicultural diversity. The World Bank classifies South Africa as an economy. Its economy is the second-largest in Africa, and the 34th-largest in the world, in terms of purchasing power parity, South Africa has the seventh-highest per capita income in Africa. However, poverty and inequality remain widespread, with about a quarter of the population unemployed, nevertheless, South Africa has been identified as a middle power in international affairs, and maintains significant regional influence. The name South Africa is derived from the geographic location at the southern tip of Africa. Upon formation the country was named the Union of South Africa in English, since 1961 the long form name in English has been the Republic of South Africa. In Dutch the country was named Republiek van Zuid-Afrika, replaced in 1983 by the Afrikaans Republiek van Suid-Afrika, since 1994 the Republic has had an official name in each of its 11 official languages. Mzansi, derived from the Xhosa noun umzantsi meaning south, is a name for South Africa. South Africa contains some of the oldest archaeological and human fossil sites in the world, extensive fossil remains have been recovered from a series of caves in Gauteng Province. The area is a UNESCO World Heritage site and has termed the Cradle of Humankind
3.
Gauteng
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Gauteng, which means place of gold, is one of the nine provinces of South Africa. It was formed part of the old Transvaal Province after South Africas first all-race elections on 27 April 1994. It was initially named Pretoria–Witwatersrand–Vereeniging and was renamed Gauteng in December 1994, situated in the Highveld, Gauteng is the smallest province in South Africa, accounting for only 1. 5% of the land area. Nevertheless, it is highly urbanised, containing the countrys largest city, Johannesburg, its capital, Pretoria. As of 2015, it has a population of nearly 13.2 million, the name Gauteng is derived from the Sotho name, gauta meaning gold with the locative suffix -eng. There was a thriving industry in the province following the 1886 discovery of gold in Johannesburg. In Sesotho, the name Gauteng was used for Johannesburg and surrounding areas long before it was adopted in 1994 as the name of a province. Gauteng, formerly known as Pretoria–Witwatersrand–Vereeniging, was carved out of the old Transvaal province in 1994, although the terminology PWV, after the discovery of gold in 1886, the region proceeded to become the single largest gold producer in the world and the city of Johannesburg was founded. The older city Pretoria was not subject to the same attention, Pretoria grew at a slower rate and was highly regarded due to its role in the Second Boer War. The Cullinan Diamond which is the largest diamond ever mined was mined near Pretoria in a town called Cullinan in the year 1905. Gauteng has only been documented since the 1800s and as a result. At the Sterkfontein caves, some of the oldest fossils of hominids have been discovered, such as Mrs. Ples, today, the Apartheid Museum stands testament to these struggles in Johannesburg. Gauteng is governed by the Gauteng Provincial Legislature, a 73-person unicameral legislature elected by party-list proportional representation. The most recent election of the legislature was held on 7 May 2014, and the African National Congress won 53. 59% of the vote. The official opposition is the Democratic Alliance, which won 30. 78% of the vote and 23 seats, other parties represented are the Economic Freedom Fighters with eight seats and the Freedom Front Plus and the Inkatha Freedom Party with one seat each. Premier David Makhura of the ANC was elected on 21 May 2014, the Gauteng Division of the High Court of South Africa, which has seats in Pretoria and Johannesburg, is a superior court with general jurisdiction over the province. Johannesburg is also home to the Constitutional Court, South Africas highest court, Gautengs southern border is the Vaal River, which separates it from the Free State. It also borders on North West to the west, Limpopo to the north, Gauteng is the only landlocked province of South Africa without a foreign border
4.
City of Johannesburg Metropolitan Municipality
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The City of Johannesburg Metropolitan Municipality is a metropolitan municipality that manages the local governance of Johannesburg, South Africa. It is divided into branches and departments in order to expedite services for the city. Johannesburg is a city, the poor mostly live in the southern suburbs or on the peripheries of the far north. As of 2012, unemployment is near 25% and most young people are out of work, around 20% of the city lives in abject poverty in informal settlements that lack proper roads, electricity, or any other kind of direct municipal service. Another 40% live in housing with insufficient municipal housing. During the apartheid era, Johannesburg was divided into 11 local authorities, seven of which were white, the first post-apartheid City Council was created in 1995. The council adopted the slogan One City, One Taxpayer in order to highlight its primary goal of addressing inequal tax revenue distribution, to this end, revenue from wealthy, traditionally white areas would help pay for services needed in poorer, black areas. The City Council was divided into four regions, each with an autonomous local regional authority that was to be overseen by a central metropolitan council. The four councils or Metropolitan Local Councils were the Northern MLCl, Southern MLC, Eastern MLC and Western MLC, in 1999, Johannesburg appointed a city manager in order to reshape the citys ailing financial situation. The manager, together with the Municipal Council, drew up a blueprint called Igoli 2002 and this was a three-year plan that called upon the government to sell non-core assets, restructure certain utilities, and required that all others become self-sufficient. The plan took the city from near insolvency to a surplus of Rand 153 million. The plan was contested by trade unions, who argued that it would result in job losses. The core of Igoli 2002 was to restructure Metro Gas, Rand Airport, the city bus service, the Johannesburg Zoo, the Civic Theatre, the Fresh Produce Market, and the citys property holdings were turned into corporations with the city as the single shareholder. Each was run as a business, with management hired on performance contracts, in 2010/11 the municipality faced a qualified audit from the Auditor-General following a large number of billing issues, as the result of the flawed implementation of a SAP system. The citys call centre also experienced a crisis at the same time, the municipality covers an area of 1,645 square kilometres, stretching from Orange Farm in the south to Midrand in the north. The 2011 census divided the municipality into the main places. In the election of 3 August 2016 the African National Congress won the largest share of the seats on the council with 121 but did not achieve a majority. On 22 August 2016, minority parties voted with the DA to elect its candidate, Herman Mashaba
5.
Johannesburg
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Johannesburg is the largest city in South Africa and is one of the 50 largest urban areas in the world. It is the capital of Gauteng, which is the wealthiest province in South Africa. While Johannesburg is not one of South Africas three capital cities, it is the seat of the Constitutional Court, the city is located in the mineral-rich Witwatersrand range of hills and is the centre of large-scale gold and diamond trade. In 2011, the population of the city of Johannesburg was 4,434,827, in the same year, the population of Greater Johannesburg Metropolitan Area was 7,860,781. Some view the surrounding the city of Johannesburg yet more broadly than the metropolitan area, adding Ekurhuleni, West Rand and Lenasia. The land area of the city is large in comparison with those of other major cities, resulting in a moderate population density of 2. The city was established in 1886 following the discovery of gold on what had been a farm, the city is commonly interpreted as the modern day El Dorado due to the extremely large gold deposit found along the Witwatersrand. The name is attributed to one or all of three men involved in the establishment of the city, in ten years, the population was 100,000 inhabitants. A separate city from the late 1970s until the 1990s, Soweto is now part of Johannesburg, Soweto, although eventually incorporated into Johannesburg, had been separated as a residential area for blacks, who were not permitted to live in Johannesburg proper. Lenasia is predominantly populated by English-speaking South Africans of Indian descent, controversy surrounds the origin of the name. There were quite a number of people with the name Johannes who were involved in the history of the city. Among them are the principal clerk attached to the office of the surveyor-general Johannes Rissik, Christiaan Johannes Joubert, another was Stephanus Johannes Paulus Paul Kruger, president of the South African Republic 1883-1900. Johannes Meyer, the first government official in the area is another possibility, precise records for the choice of name were lost. Rissik and Joubert were members of a delegation sent to England to attain mining rights for the area. Joubert had a park in the city named after him and Rissik Street is today a street where the historically important and dilapidated Post Office, since burnt out. The region surrounding Johannesburg was originally inhabited by San people, the Sotho–Tswana practised farming and extensively mined and smelted metals that were available in the area. The most prominent site within Johannesburg is Melville Koppies, which contains an iron smelting furnace, the main Witwatersrand gold reef was discovered in June 1884 on the farm Vogelstruisfontein by Jan Gerritse Bantjes that triggered the Witwatersrand Gold Rush and the start of Johannesburg in 1886. The discovery of gold rapidly attracted people to the area, making necessary a name, Johannes Meyer, the first government official in the area is another possibility
6.
First language
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A first language is a language that a person has been exposed to from birth or within the critical period. If there are multiple L1, the designation first language is used for the L1 spoken the best or the one that is the basis for sociolinguistic identity. In some countries, the native language or mother tongue refers to the language of ones ethnic group rather than ones first language. Children brought up speaking more than one language can have more than one native language, by contrast, a second language is any language that one speaks other than ones first language. Native speakers are considered to be an authority on their language because of their natural acquisition process regarding the language. That is achieved by interaction with the language and speakers of the language. Native speakers will not necessarily be knowledgeable about every rule of the language. Sometimes, the mother tongue or mother language is used for the language that a person learned as a child at home. Children growing up in homes can, according to this definition, have more than one mother tongue or native language. It is quite possible that the first language learned is no longer a dominant language. According to Ivan Illich, the mother tongue was first used by Catholic monks to designate a particular language they used, instead of Latin. That is, the mother the Church introduced this term. J. R. R. Tolkien, in his 1955 lecture English and Welsh, on 17 November 1999, UNESCO designated 21 February as International Mother Language Day. The first language of a child is part of the personal, social and cultural identity, another impact of the first language is that it brings about the reflection and learning of successful social patterns of acting and speaking. It is basically responsible for differentiating the linguistic competence of acting and that has implications on the education of non-native speakers. The topic of native speaker also gives way to discussion about what exactly bilingualism is, one definition is that a person is bilingual by being equally proficient in both languages. A person who grows up speaking English and begins learning Spanish for four years is not necessarily bilingual unless he speaks the two languages with equal fluency, one can have two or more native languages, thus being a native bilingual or indeed multilingual. The order in which languages are learned is not necessarily the order of proficiency
7.
Zulu language
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Zulu is the language of the Zulu people, with about 10 million speakers, the vast majority of whom live in South Africa. Zulu is the most widely spoken language in South Africa. It became one of South Africas 11 official languages in 1994, according to Ethnologue, it is the second most widely spoken of the Bantu languages, after Shona. Like many other Bantu languages, it is written with the Latin alphabet, even in English, the language is often referred to by using its native form, isiZulu. Zulu migrant populations have taken it to adjacent regions, especially Zimbabwe, Xhosa, the predominant language in the Eastern Cape, is often considered mutually intelligible with Zulu. Maho lists four dialects, central KwaZulu-Natal Zulu, northern Transvaal Zulu, eastern coastal Qwabe, the Zulu, like Xhosa and other Nguni people, have lived in South Africa for a long time. The Zulu language possesses several click sounds typical of Southern African languages, the Nguni people have coexisted with other Southern tribes like the San and Khoi. Zulu, like most indigenous Southern African languages, was not a written language until the arrival of missionaries from Europe, the first grammar book of the Zulu language was published in Norway in 1850 by the Norwegian missionary Hans Schreuder. The first written document in Zulu was a Bible translation that appeared in 1883, in 1901, John Dube, a Zulu from Natal, created the Ohlange Institute, the first native educational institution in South Africa. He was also the author of Insila kaShaka, the first novel written in Zulu, another pioneering Zulu writer was Reginald Dhlomo, author of several historical novels of the 19th-century leaders of the Zulu nation, U-Dingane, U-Shaka, U-Mpande, U-Cetshwayo and U-Dinizulu. Other notable contributors to Zulu literature include Benedict Wallet Vilakazi and, more recently, the written form of Zulu was controlled by the Zulu Language Board of KwaZulu-Natal. This board has now disbanded and superseded by the Pan South African Language Board which promotes the use of all eleven official languages of South Africa. English, Dutch and later Afrikaans had been the official languages used by all South African governments before 1994. However, in the Kwazulu bantustan the Zulu language was widely used, all education in the country at the high-school level was in English or Afrikaans. Since the demise of apartheid in 1994, Zulu has been enjoying a marked revival, zulu-language television was introduced by the SABC in the early 1980s and it broadcasts news and many shows in Zulu. Zulu radio is very popular and newspapers such as isoLezwe, Ilanga and UmAfrika in the Zulu language are available, mainly available in Kwazulu-Natal province, in January 2005 the first full-length feature film in Zulu, Yesterday, was nominated for an Oscar. South African matriculation requirements no longer specify which South African language needs to be taken as a second language, and some people have made the switch to learning Zulu. However people taking Zulu at high-school level overwhelmingly take it as a first language, according to statistics, in the 1994 film The Lion King, in the Circle of Life song, the phrases Ingonyama nengw enamabala, Nans ingonyama bakithi Baba and Siyonqoba were used
8.
Sotho language
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Like all Bantu languages, Sesotho is an agglutinative language, which uses numerous affixes and derivational and inflexional rules to build complete words. Within the Sotho-Tswana group, Sesotho proper is most closely related to Lozi, the Northern Sotho group is geographical, and includes a number of dialects also closely related to Sesotho-Lozi. Tswana is also known as Western Sesotho, Sotho is a tribal suffix, i. e. the name of the Sotho people or Basotho, while Sesotho is the term for the language of the Basotho. Use of Sesotho rather than Sotho language in English has seen increasing use since the 1980s, especially in South African English, the Nguni language Phuthi has been heavily influenced by Sesotho, its speakers have mixed Nguni and Sotho–Tswana ancestry. It seems that it is sometimes treated erroneously as a dialect of Sesotho called Sephuthi, however, Phuthi is mutually unintelligible with standard Sesotho and thus cannot in any sense be termed a dialect of it. These were the first peoples to be called Basotho, before many of their descendants, the situation is even further complicated by various historical factors, such as members of parent clans joining their descendants or various clans calling themselves by the same names. According to the South African National Census of 2011, there were almost four million first language Sesotho speakers recorded in South Africa – approximately eight per cent of the population. Sesotho is also the language spoken by the people of Lesotho. The census fails, to record other South Africans for whom Sesotho is a second or third language, such speakers are found in all major residential areas of Metropolitan Municipalities - such as Johannesburg, and Tshwane - where multilingualism and polylectalism are very high. Sesotho is one of the official languages of South Africa. Sesotho is one of the languages from which the pseudo-language Tsotsitaal is derived. Tsotsitaal is not a language, as it is primarily a unique vocabulary. It is a part of the culture in most Southern Gauteng townships and is the primary language used in Kwaito music. The sound system of Sesotho is unusual in many respects and it has ejective consonants, click consonants, a uvular trill, a relatively large number of affricate consonants, no prenasalised consonants, and a rare form of vowel-height harmony. In total, the language contains some 39 consonantal and 9 vowel phonemes and it also has a large number of complex sound transformations which often change the phones of words due to the influence of other sounds. The most striking properties of Sesotho grammar, and the most important properties which reveal it as a Bantu language, are its noun gender, the grammatical gender system does not encode sex gender, and indeed, Bantu languages in general are not grammatically marked for gender. Another well-known property of the Bantu languages is their agglutinative morphology, additionally, they tend to lack any grammatical case systems, indicating noun roles almost exclusively through word order. Sotho calendar Sotho people South African Translators Association Sesotho Online A gentle introduction to the Sesotho language, weblog on Sesotho Translate. org. za Project translating Free and Open Source Software into South African languages, including Sesotho
9.
Southern Ndebele language
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The Transvaal Ndebele language is an African language belonging to the Nguni group of Bantu languages, and spoken by the amaNdebele. There is also another language called Zimbabwean Ndebele, or Matabele, spoken in Zimbabwe, king Musi was a polygamist and fathered the following sons, Skhosana, Manala, Ndzundza, Thombeni, Sibasa, Mhwaduba and Mphafuli and others. Ndebele is one of the official languages in the Republic of South Africa. The language is a Nguni or Zunda classification spoken mostly in the Mpumalanga Province, Gauteng, Limpopo, the expression isikhethu can be loosely translated to mean the Ndebele way of doing or saying. Isikhethu means Ndebele the same way that sikitsi will mean Swazi, the language has been severely marginalised over the years. Until the formation of the apartheid Ndebele homeland, speaking the language publicly was discouraged, most Ndebele speakers preferred Zulu especially because the latter was learned at school. Months in Ndebele The two Ndebele groups are part of the Nguni language group and are therefore mutually intelligible to some extent. However, the Zimbabwean Ndebele is part of the Zunda sub-group of the Nguni languages while the South African, while maintaining its Nguni roots, has been influenced by the Sotho languages
10.
Tsonga language
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Tsonga is a southern African Bantu language spoken by the Tsonga people. It was officially created in 1875 at the Valdezia Mission Station, the Swiss Missionaries refused to recognise Tswa and Ronga as independent languages from Xitsonga because, according to them, Tswa and Ronga are 99% related to Xitsonga. At Valdezia Mission Station and the Elim Mission Station, Tswa, but in Mozambique, Tswa, Ronga and Xitsonga continue to exist as independent languages. The name Tsonga is the root of Xitsonga, Mutsonga, Vatsonga, in the language of the Vatsonga themselves, the root never appears by itself. It is Tsonga for the ease and accessibility of the international community. As for the origins of the name, there are three theories, the first states that Tsonga is another pronunciation for Dzonga, which means south and also the name of one of the dialects of Xitsonga. The second theory is that is comes from Thonga, the Zulu way of saying slave, why the people would be called slaves is unclear. The other Zulu explanation is that Zulu people have difficulty pronouncing r, however, rh in Tsonga becomes th in Zulu. An example is rhuma becomes thuma, the third and most accepted is that it is another pronunciation for Rhonga, the root for the word vurhonga for east or the direction where the sun rises. Vurhonga also means morning in Xitsonga, Rhonga is one of the Tsonga languages. The physical evidence of most Tsonga people residing along the eastern coast of Africa in the south, extending inland in a westward direction, Tsonga people and languages are, Chopi, Gwamba, Ndau, Ronga, Tonga and Tswa. Among these languages, three groups can be identified. These are S50, S60, and Ndau language, currently falling under the Shona group, in total there are six recognised languages. Chope Group Chopi dialects are Copi, Khambani, Lambwe, Lenge, Ndonge, Ndau Group Ndau dialects are Changa, Danda, Dondo, Gova, Ndau, and Tswa-Ronga Group Ronga dialects are Kalanga, Konde, Putru, and Ssonge. Gwamba dialects are Bila, Changana, Djonga, Hlanganu, Hlave, Kande, Khosa, Luleke, Nwalungu, Nkuma, Songa, Valoyi, Xika, Tswa dialects are Dzibi, Dzibi-Dzonga, Tshwa, Hlengwe, Khambani, Makwakwe-Khambani, Mandla, Ndxhonge, and Nhayi. Some dialects are subdialects but have been mentioned here for completeness, for example, Valoyi and Luleke comprise the Nwalungu dialect. There is no Gwamba dialect as Gwamba is another name for Xitsonga itself, formally Xitsonga has been called Gwamba. Tswa-Ronga dialects not considered part of the family include Pulana and it has been said that the two dialects that unite all Tswa-Ronga languages are Nkuna and Khosa
11.
South African Standard Time
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South African Standard Time is the time zone used by all of South Africa, as well as Swaziland and Lesotho. The zone is two hours ahead of UTC and is the same as Central Africa Time, daylight saving time is not observed in either time zone. Thus, most of South Africas population experience true solar noon at approximately 12,00 daily, the western Northern Cape and Western Cape differ however. Everywhere on land west of 22°30′ E effectively experiences year-round daylight saving time because of its location in true UTC+1, sunrise and sunset are thus relatively late in Cape Town compared to the rest of the country. Before 8 February 1892, there was no uniformity of time in South Africa, in 1892, a railway conference was held in Bloemfontein and discussed difficulty of working a railway system, in the absence of a uniform time system. The governments of the Orange Free State, Transvaal and the Cape Colony officially adopted a standard time of Greenwich Mean Time +01,30 which was defined as mean time 22. 5° east of Greenwich. On 1 March 1903 GMT+02,00 was adopted, which became the current UTC+02,00 when UTC replaced GMT for most purposes, prior to 1 March 1903, the Colony of Natal was already using a uniform time supplied by the Natal Observatory. The observatorys local mean time was GMT+1,57, South Africa observed a daylight saving time of GMT+3,00 between 20 September 1942 to 21 March 1943 and 19 September 1943 to 21 March 1944. South African Standard Time is defined as Coordinated Universal Time plus two hours
12.
Witwatersrand
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The Witwatersrand aka The Reef, is a 56-kilometre-long north-facing scarp in the Gauteng Province of South Africa. This east–west-running scarp can be traced with only one short gap from Bedfordview in the east, through Johannesburg and Roodepoort, the scarp forms the northern edge of a 7- to 10-kilometre-wide plateau which rises about 200 m above the surrounding plains of the Highveld. The entire plateau-like structure is often called the “Witwatersrand”. The plateau’s elevation above sea-level is between 1700–1800 m, the Witwatersrand lies within the province of Gauteng, formerly called the “PWV”, an abbreviation for Pretoria, Witwatersrand and Vereeniging. When used in this context, the term Witwatersrand refers to the entire Greater Johannesburg Metropolitan Area. This conurbation is oblong in shape and runs from Springs in the east to Randfontein and Carletonville in the west and this area is also often colloquially referred to as “the Rand” or “Wits”. Because of the quantities of gold that have been extracted from the Witwatersrand rocks. The Witwatersrand plateau consists of a 5000- to 7000-metre-thick layer of sedimentary rocks laid down over a period of about 260 million years. The oldest rocks form the northern scarp of the Witwatersrand plateau, Gold is found in the conglomerate strata of the younger members of the Supergroup. The abundance of gold is without equal anywhere else in the world. Over 50000 tons have been mined from these rocks since this precious metal was first discovered here in 1886 and this accounts for approximately 50% of all the gold ever mined on earth. The gold-bearing conglomerates occur chiefly in the upper, younger layers of the Witwatersrand Supergroup of rocks, the Witwatersrand Supergroup strata which reach the surface in Johannesburg dip downwards to the south at an angle of about 30°. From there on they are almost everywhere, with few exceptions. Gold mining in these buried portions of the Witwatersrand Supergroup is sometimes carried out at depths of 4 kilometres below the surface, the Kaapvaal Craton, one of the first microcontinents to form on Earth through plate tectonics, was assembled about 3900 million years ago. Its size and position relative to Southern Africa today is indicated in the diagram on the left, about 3000 million years ago local cooling of the underlying asthenosphere caused subsidence of the south-eastern portion of this microcontinent below sea level. The floor of newly formed “Witwatersrand sea” consisted of smoothly eroded granites. Sandy sediments brought in by rivers from the north started being deposited on the granite about 2970 million years ago and this sandy layer eventually became compressed to form the Orange Grove Quartzite, the lowermost layer of the Witwatersrand Supergroup. This quartzite formation forms the scarp from which the Witwatersrand derives its name, as the sea deepened finer grained and muddy sediments accumulated
13.
International Standard Book Number
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The International Standard Book Number is a unique numeric commercial book identifier. An ISBN is assigned to each edition and variation of a book, for example, an e-book, a paperback and a hardcover edition of the same book would each have a different ISBN. The ISBN is 13 digits long if assigned on or after 1 January 2007, the method of assigning an ISBN is nation-based and varies from country to country, often depending on how large the publishing industry is within a country. The initial ISBN configuration of recognition was generated in 1967 based upon the 9-digit Standard Book Numbering created in 1966, the 10-digit ISBN format was developed by the International Organization for Standardization and was published in 1970 as international standard ISO2108. Occasionally, a book may appear without a printed ISBN if it is printed privately or the author does not follow the usual ISBN procedure, however, this can be rectified later. Another identifier, the International Standard Serial Number, identifies periodical publications such as magazines, the ISBN configuration of recognition was generated in 1967 in the United Kingdom by David Whitaker and in 1968 in the US by Emery Koltay. The 10-digit ISBN format was developed by the International Organization for Standardization and was published in 1970 as international standard ISO2108, the United Kingdom continued to use the 9-digit SBN code until 1974. The ISO on-line facility only refers back to 1978, an SBN may be converted to an ISBN by prefixing the digit 0. For example, the edition of Mr. J. G. Reeder Returns, published by Hodder in 1965, has SBN340013818 -340 indicating the publisher,01381 their serial number. This can be converted to ISBN 0-340-01381-8, the check digit does not need to be re-calculated, since 1 January 2007, ISBNs have contained 13 digits, a format that is compatible with Bookland European Article Number EAN-13s. An ISBN is assigned to each edition and variation of a book, for example, an ebook, a paperback, and a hardcover edition of the same book would each have a different ISBN. The ISBN is 13 digits long if assigned on or after 1 January 2007, a 13-digit ISBN can be separated into its parts, and when this is done it is customary to separate the parts with hyphens or spaces. Separating the parts of a 10-digit ISBN is also done with either hyphens or spaces, figuring out how to correctly separate a given ISBN number is complicated, because most of the parts do not use a fixed number of digits. ISBN issuance is country-specific, in that ISBNs are issued by the ISBN registration agency that is responsible for country or territory regardless of the publication language. Some ISBN registration agencies are based in national libraries or within ministries of culture, in other cases, the ISBN registration service is provided by organisations such as bibliographic data providers that are not government funded. In Canada, ISBNs are issued at no cost with the purpose of encouraging Canadian culture. In the United Kingdom, United States, and some countries, where the service is provided by non-government-funded organisations. Australia, ISBNs are issued by the library services agency Thorpe-Bowker
