1.
Romanian language
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Romanian is a Romance language spoken by around 24 million people as a native language, primarily in Romania and Moldova, and by another 4 million people as a second language. It has official status in Romania and the Republic of Moldova and it is one of the official languages of the European Union and the Latin Union. Romanian is a part of the Balkan-Romance group that evolved from several dialects of Vulgar Latin separated from the Western Romance during the 5th–8th centuries. To distinguish it within that group in comparative linguistics it is called Daco-Romanian as opposed to its closest relatives, Aromanian, Megleno-Romanian, and Istro-Romanian. Eastern Romance languages, like the branches of Romance languages, descend from Vulgar Latin. These vestiges of military usage are unique to Romanian in its language family. s. o, sat village, șes plain, a supune, tindă veranda, țară homeland a. s. o. This linguistic evidence challenges the Roeslerian theory, the vestiges from sermo castrensis particularize the Romanian language in the neolatin area, together with its isolated history. e. With Rom. māgurā and Alb. magulë etc, the Roman Empire withdrew from Dacia in 271–272 AD, leaving it to the Goths. The history of Eastern Romance between the 3rd century and the development of Proto-Romanian by the 10th century, when the area came under the influence of the Byzantine Empire, is unknown. It is a matter of debate whether Proto-Romanian developed among Romanized people who were left behind in Dacia by the Roman withdrawal or among Latin-speakers in the Balkans south of the Danube, during the Middle Ages, Romanian became influenced by the Slavic languages and to some degree by Greek. Romanian remains unattested throughout the Middle Ages, and only enters the record in the early 16th century. The use of the denomination Romanian for our language and use of the demonym Romanians for speakers of this language predates the foundation of the modern Romanian state. In 1534, Tranquillo Andronico notes, Valachi nunc se Romanos vocant, francesco della Valle writes in 1532 that Romanians are calling themselves Romans in their own language, and he subsequently quotes the expression, Știi Românește. After travelling through Wallachia, Moldavia and Transylvania Ferrante Capecci accounts in 1575 that the population of these regions call themselves românești. Pierre Lescalopier writes in 1574 that those who live in Moldavia, Wallachia, the Transylvanian Saxon Johann Lebel writes in 1542 that Vlachi se numeau între ei Romuini and the Polish chronicler Stanislaw Orzechowski notes in 1554 that în limba lor walachii se numesc romini. In Palia de la Orăștie stands written «, că văzum cum toate limbile au și înfluresc întru cuvintele slăvite a lui Dumnezeu numai noi românii pre limbă nu avem. și le-au dăruit voo fraților români. », nevertheless, the oldest extant document written in Romanian remains Neacșus letter and was written using Cyrillic letters. There are no records of any documents written in Romanian from before 1521
2.
Serbian language
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Serbian is the standardized variety of the Serbo-Croatian language mainly used by Serbs. It is the language of Serbia and one of the three official languages of Bosnia and Herzegovina. In addition, it is a minority language in Montenegro, Croatia, Macedonia, Romania, Hungary, Slovakia. Standard Serbian is based on the most widespread dialect of Serbo-Croatian, Shtokavian, which is also the basis of Standard Croatian, Bosnian, the other dialect spoken by Serbs is Torlakian in southeastern Serbia, which is transitional to Macedonian and Bulgarian. Serbian is practically the only European standard language with complete synchronic digraphia, the Serbian Cyrillic alphabet was devised in 1814 by Serbian linguist Vuk Karadžić, who created the alphabet on phonemic principles. The Latin alphabet was designed by Croatian linguist Ljudevit Gaj in 1830, Serbian is a standardized variety of Serbo-Croatian, a Slavic language, of the South Slavic subgroup. Other standardized forms of Serbo-Croatian are Bosnian, Croatian, and Montenegrin and it has lower intelligibility with the Eastern South Slavic languages Bulgarian and Macedonian, than with Slovene. The 2011 census show that 42. 88% still declare Serbian to be their native language, Standard Serbian language uses both Cyrillic and Latin script. Even in official government documents this constitutional requirement is rarely enforced, Serbian is a rare example of synchronic digraphia, a situation where all literate members of a society have two interchangeable writing systems available to them. Media and publishers typically select one alphabet or another, for example, the public broadcaster, Radio Television of Serbia, predominantly uses the Cyrillic script whereas the privately run broadcasters, like RTV Pink, predominantly use the Latin script. A survey from 2014 showed that 47% of the Serbian population favors the Latin alphabet whereas 36% favors the Cyrillic one and these are the tenses of the indicative mood. Apart from the mood, there is also the imperative mood. The conditional mood has two more tenses, the first conditional and the second conditional, Serbian has active and passive voice. As for the verb forms, Serbian has one infinitive. Most Serbian words are of native Slavic lexical stock, tracing back to the Proto-Slavic language, there are many loanwords from different languages, reflecting cultural interaction throughout history. Notable loanwords were borrowed from Greek, Latin, Italian, Turkish, Hungarian, Russian, Serbian literature emerged in the Middle Ages, and included such works as Miroslavljevo jevanđelje in 1192 and Dušanov zakonik in 1349. In the mid-15th century, Serbia was conquered by the Ottoman Empire, however, some of the greatest literary works in Serbian come from this time, in the form of oral literature, the most notable form being Serbian epic poetry. The epic poems were written down in the 19th century, and preserved in oral tradition up to the 1950s
3.
Bulgarian language
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Bulgarian /bʌlˈɡɛəriən/, /bʊlˈ-/ is an Indo-European language, a member of the Southern branch of the Slavic language family. Various evidential verb forms exist to express unwitnessed, retold, with the accession of Bulgaria to the European Union on 1 January 2007, Bulgarian became one of the official languages of the European Union. Development of the Bulgarian language may be divided into several periods, prehistoric period – occurred between the Slavonic migration to eastern Balkans and the mission of Saints Cyril and Methodius to Great Moravia in the 860s. Old Bulgarian – a literary norm of the southern dialect of the Common Slavic language from which Bulgarian evolved. It was used by Saints Cyril and Methodius and their disciples to translate the Bible, Middle Bulgarian – a literary norm that evolved from the earlier Old Bulgarian, after major innovations were accepted. It was a language of literary activity and the official administration language of the Second Bulgarian Empire. Modern Bulgarian – dates from the 16th century onwards, undergoing general grammar, present-day written Bulgarian language was standardized on the basis of the 19th-century Bulgarian vernacular. Bulgarian was the first Slavic language attested in writing, as Slavic linguistic unity lasted into late antiquity, in the oldest manuscripts this language was initially referred to as языкъ словяньскъ, the Slavic language. In the Middle Bulgarian period this name was replaced by the name языкъ блъгарьскъ. In some cases, the name языкъ блъгарьскъ was used not only with regard to the contemporary Middle Bulgarian language of the copyist but also to the period of Old Bulgarian. During the Middle Bulgarian period, the language underwent dramatic changes, losing the Slavonic case system, today one difference between Bulgarian dialects in the country and literary spoken Bulgarian is the significant presence of Old Bulgarian words and even word forms in the latter. Russian loans are distinguished from Old Bulgarian ones on the basis of the presence of specifically Russian phonetic changes, as in оборот, непонятен, ядро and others. As usual in cases, many other loans from French, English. Modern Bulgarian was based essentially on the Eastern dialects of the language, between 1835–1878 more than 25 proposals were put forward and linguistic chaos ensued. Eventually the eastern dialects prevailed, and in 1899 the Ministry of Education officially codified a standard Bulgarian language based on the Drinov-Ivanchev orthography, the language is mainly split into two broad dialect areas, based on the different reflexes of the Common Slavic yat vowel. This split, which occurred at some point during the Middle Ages, led to the development of Bulgarias, E. g. млеко – milk, хлеб – bread. This rule obtains in most Eastern dialects, although some have ya, or an open e sound. The literary language norm, which is based on the Eastern dialects
4.
German language
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German is a West Germanic language that is mainly spoken in Central Europe. It is the most widely spoken and official language in Germany, Austria, Switzerland, South Tyrol, the German-speaking Community of Belgium and it is also one of the three official languages of Luxembourg. Major languages which are most similar to German include other members of the West Germanic language branch, such as Afrikaans, Dutch, English, Luxembourgish and it is the second most widely spoken Germanic language, after English. One of the languages of the world, German is the first language of about 95 million people worldwide. The German speaking countries are ranked fifth in terms of publication of new books. German derives most of its vocabulary from the Germanic branch of the Indo-European language family, a portion of German words are derived from Latin and Greek, and fewer are borrowed from French and English. With slightly different standardized variants, German is a pluricentric language, like English, German is also notable for its broad spectrum of dialects, with many unique varieties existing in Europe and also other parts of the world. The history of the German language begins with the High German consonant shift during the migration period, when Martin Luther translated the Bible, he based his translation primarily on the standard bureaucratic language used in Saxony, also known as Meißner Deutsch. Copies of Luthers Bible featured a long list of glosses for each region that translated words which were unknown in the region into the regional dialect. Roman Catholics initially rejected Luthers translation, and tried to create their own Catholic standard of the German language – the difference in relation to Protestant German was minimal. It was not until the middle of the 18th century that a widely accepted standard was created, until about 1800, standard German was mainly a written language, in urban northern Germany, the local Low German dialects were spoken. Standard German, which was different, was often learned as a foreign language with uncertain pronunciation. Northern German pronunciation was considered the standard in prescriptive pronunciation guides though, however, German was the language of commerce and government in the Habsburg Empire, which encompassed a large area of Central and Eastern Europe. Until the mid-19th century, it was essentially the language of townspeople throughout most of the Empire and its use indicated that the speaker was a merchant or someone from an urban area, regardless of nationality. Some cities, such as Prague and Budapest, were gradually Germanized in the years after their incorporation into the Habsburg domain, others, such as Pozsony, were originally settled during the Habsburg period, and were primarily German at that time. Prague, Budapest and Bratislava as well as cities like Zagreb, the most comprehensive guide to the vocabulary of the German language is found within the Deutsches Wörterbuch. This dictionary was created by the Brothers Grimm and is composed of 16 parts which were issued between 1852 and 1860, in 1872, grammatical and orthographic rules first appeared in the Duden Handbook. In 1901, the 2nd Orthographical Conference ended with a standardization of the German language in its written form
5.
Hungarian language
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Hungarian is the official language of Hungary and one of the 24 official languages of the European Union. Outside Hungary it is spoken by communities of Hungarian people in neighbouring countries. Like Finnish and Estonian, it belongs to the Uralic language family, its closest relatives being Mansi and it is one of several European languages not part of the Indo-European languages, and the most widely-spoken European language that does not belong to the Indo-European family. The Hungarian name for the language is magyar or magyar nyelv, the word Magyar is used as an English and Hungarian word to refer to Hungarian people as an ethnic group. Hungarian is a member of the Uralic language family, the name of Hungary could be a result of regular sound changes of Ungrian/Ugrian, and the fact that the Eastern Slavs referred to Hungarians as Ǫgry/Ǫgrove seemed to confirm that. Current literature favors the hypothesis that it comes from the name of the Turkic tribe Onogur, there are numerous regular sound correspondences between Hungarian and the other Ugric languages. For example, Hungarian /aː/ corresponds to Khanty /o/ in certain positions, for example, Hungarian ház house vs. Khanty xot house, and Hungarian száz hundred vs. Khanty sot hundred. The distance between the Ugric and Finnic languages is greater, but the correspondences are also regular, during the later half of the 19th century, a competing hypothesis proposed a Turkic affinity of Hungarian. Following an academic debate known as Az ugor-török háború, the Finno-Ugric hypothesis was concluded the sounder of the two, foremost based on work by the German linguist Josef Budenz. The traditional view argues that the Hungarian language separated from its Ugric relatives in the first half of the 1st millennium b. c. e. in western Siberia, east of the southern Urals. The Hungarians gradually changed their lifestyle from settled hunters to nomadic pastoralists, in Hungarian, Iranian loans date back to the time immediately following the breakup of Ugric and probably span well over a millennium. Among these include tehén ‘cow’, tíz ‘ten’, tej ‘milk’, increasing archaeological evidence from present-day southern Bashkortostan found in the previous decades confirms the existence of Hungarian settlements between the Volga River and Ural Mountains. The Onogurs later had a influence on the language, especially between the 5th-9th centuries. This layer of Turkic loans is large and varied, and includes words borrowed from Oghur Turkic, e. g. borjú ‘calf’, dél ‘noon, many words related to agriculture, to state administration or even to family relations have such backgrounds. Hungarian syntax and grammar were not influenced in a dramatic way during these 300 years. After the arrival of the Hungarians into the Carpathian Basin the language came into contact with different speech communities, Turkic loans from this period come mainly from the Pechenegs and Cumanians who settled in Hungary during the 12th-13th centuries, e. g. koboz ‘cobza’, komondor ‘mop dog’. Hungarian borrowed many words from especially the neighbouring Slavic languages, in exchange, these languages also borrowed words from Hungarian, e. g. Serbo-Croatian ašov from Hung ásó ‘spade’. Approximately 1. 6% of the Romanian lexicon is of Hungarian origin, on the basis of the growing genetic evidence, the accepted origin theory is contested by geneticists too
6.
Canyon
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A canyon or gorge is a deep cleft between escarpments or cliffs resulting from the erosive activity of a river over geologic timescales. A canyon may also refer to a rift between two peaks, such as those in ranges including the Rocky Mountains, the Alps. Usually a river or stream and erosion carve out such splits between mountains, examples of mountain-type canyons are Provo Canyon in Utah or Yosemite National Park in Californias Sierra Nevada. Canyons within mountains, or gorges that have an opening on one side are called box canyons. Slot canyons are very narrow canyons, often with smooth walls, steep-sided valleys in the seabed of the continental slope underwater are referred to as submarine canyons. Unlike canyons on land, submarine canyons are thought to be formed by turbidity currents, the word canyon is Spanish in origin, with the same meaning. The word canyon is used in North America while the words gorge and ravine are used in Europe and Oceania, though gorge. In the United States, place names generally use canyon in the southwest and gorge in the northeast, in Canada, a gorge is usually narrow while a ravine is more open and often wooded. The military-derived word defile is occasionally used in the United Kingdom, most canyons were formed by a process of long-time erosion from a plateau or table-land level. The cliffs form because harder rock strata that are resistant to erosion, Canyons are much more common in arid than in wet areas because physical weathering has a more localized effect in arid zones. The wind and water from the combine to erode and cut away less resistant materials such as shales. The freezing and expansion of water also serves to help form canyons, water seeps into cracks between the rocks and freezes, pushing the rocks apart and eventually causing large chunks to break off the canyon walls, in a process known as frost wedging. Canyon walls are formed of resistant sandstones or granite. Sometimes large rivers run through canyons as the result of geological uplift. These are called entrenched rivers, because they are unable to alter their course. In the United States, the Colorado River in the Southwest, Canyons often form in areas of limestone rock. As limestone is soluble to an extent, cave systems form in the rock. When these collapse, a canyon is left, as in the Mendip Hills in Somerset and Yorkshire Dales in Yorkshire, England
7.
Danube
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The Danube is Europes second-longest river, after the Volga River, and also the longest river in the European Union region. It is located in Central and Eastern Europe, the Danube was once a long-standing frontier of the Roman Empire, and today flows through 10 countries, more than any other river in the world. Its drainage basin extends into nine more countries, the Latin name Dānuvius is one of a number of Old European river names derived from a Proto-Indo-European *dānu. Other river names from the root include the Dunajec, Dzvina/Daugava, Don, Donets, Dnieper, Dniestr. In Rigvedic Sanskrit, dānu means fluid, drop, in Avestan, in the Rigveda, Dānu once appears as the mother of Vrtra. Known to the ancient Greeks as the Istros a borrowing from a Daco-Thracian name meaning strong, in Latin, the Danube was variously known as Danubius, Danuvius or as Ister. The Dacian/Thracian name was Donaris for the upper Danube and Istros for the lower Danube, the Thraco-Phrygian name was Matoas, the bringer of luck. The Latin name is masculine, as are all its Slavic names, the German Donau is feminine, as it has been re-interpreted as containing the suffix -ouwe wetland. Classified as a waterway, it originates in the town of Donaueschingen, in the Black Forest of Germany, at the confluence of the rivers Brigach. The Danube then flows southeast for about 2,800 km, passing through four capital cities before emptying into the Black Sea via the Danube Delta in Romania and its drainage basin extends into nine more. The highest point of the basin is the summit of Piz Bernina at the Italy–Switzerland border. The land drained by the Danube extends into other countries. Many Danubian tributaries are important rivers in their own right, navigable by barges, from its source to its outlet into the Black Sea, its main tributaries are, The Danube flows through many cities, including four national capitals, more than any other river in the world. Danube remains a mountain river until Passau, with average bottom gradient 0. 0012%. Middle Section, From Devín Gate to Iron Gate, at the border of Serbia and Romania, the riverbed widens and the average bottom gradient becomes only 0. 00006%. Lower Section, From Iron Gate to Sulina, with average gradient as little as 0. 00003%, about 60 of its tributaries are also navigable. In 1994 the Danube was declared one of ten Pan-European transport corridors, routes in Central, the amount of goods transported on the Danube increased to about 100 million tons in 1987. In 1999, transport on the river was difficult by the NATO bombing of three bridges in Serbia during the Kosovo War
8.
Serbia
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Serbia, officially the Republic of Serbia, is a sovereign state situated at the crossroads of Central and Southeast Europe, covering the southern part of the Pannonian Plain and the central Balkans. Relative to its territory, it is a diverse country distinguished by a transitional character, situated along cultural, geographic, climatic. Serbia numbers around 7 million residents, and its capital, Belgrade, following the Slavic migrations to the Balkans from the 6th century onwards, Serbs established several states in the early Middle Ages. The Serbian Kingdom obtained recognition by Rome and the Byzantine Empire in 1217, in the early 19th century, the Serbian Revolution established the nation-state as the regions first constitutional monarchy, which subsequently expanded its territory. During the breakup of Yugoslavia, Serbia formed a union with Montenegro which dissolved peacefully in 2006, in 2008 the parliament of the province of Kosovo unilaterally declared independence, with mixed responses from the international community. Serbia is a member of organizations such as the UN, CoE, OSCE, PfP, BSEC. An EU membership candidate since 2012, Serbia has been negotiating its EU accession since January 2014, the country is acceding to the WTO and is a militarily neutral state. Serbia is an income economy with dominant service sector, followed by the industrial sector. The country ranks high on the Social Progress Index as well as the Global Peace Index, relatively high on the Human Development Index, located at the crossroads between Central and Southern Europe, Serbia is found in the Balkan peninsula and the Pannonian Plain. Serbia lies between latitudes 41° and 47° N, and longitudes 18° and 23° E. The country covers a total of 88,361 km2, which places it at 113th place in the world, with Kosovo excluded, the area is 77,474 km2. Its total border length amounts to 2,027 km, all of Kosovos border with Albania, Macedonia and Montenegro are under control of the Kosovo border police. The Pannonian Plain covers the third of the country while the easternmost tip of Serbia extends into the Wallachian Plain. The terrain of the part of the country, with the region of Šumadija at its heart. Mountains dominate the third of Serbia. Dinaric Alps stretch in the west and the southwest, following the flow of the rivers Drina, the Carpathian Mountains and Balkan Mountains stretch in a north–south direction in eastern Serbia. Ancient mountains in the southeast corner of the country belong to the Rilo-Rhodope Mountain system, elevation ranges from the Midžor peak of the Balkan Mountains at 2,169 metres to the lowest point of just 17 metres near the Danube river at Prahovo. The largest lake is Đerdap Lake and the longest river passing through Serbia is the Danube, the climate of Serbia is under the influences of the landmass of Eurasia and the Atlantic Ocean and Mediterranean Sea
9.
Romania
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Romania is a sovereign state located in Southeastern Europe. It borders the Black Sea, Bulgaria, Ukraine, Hungary, Serbia and it has an area of 238,391 square kilometres and a temperate-continental climate. With over 19 million inhabitants, the country is the member state of the European Union. Its capital and largest city, Bucharest, is the sixth-largest city in the EU, the River Danube, Europes second-longest river, rises in Germany and flows in a general southeast direction for 2,857 km, coursing through ten countries before emptying into Romanias Danube Delta. The Carpathian Mountains, which cross Romania from the north to the southwest are marked by one of their tallest peaks, Moldoveanu, modern Romania was formed in 1859 through a personal union of the Danubian Principalities of Moldavia and Wallachia. The new state, officially named Romania since 1866, gained independence from the Ottoman Empire in 1877, at the end of World War I, Transylvania, Bukovina and Bessarabia united with the sovereign Kingdom of Romania. Romania lost several territories, of which Northern Transylvania was regained after the war, following the war, Romania became a socialist republic and member of the Warsaw Pact. After the 1989 Revolution, Romania began a transition back towards democracy and it has been a member of NATO since 2004, and part of the European Union since 2007. A strong majority of the population identify themselves as Eastern Orthodox Christians and are speakers of Romanian. The cultural history of Romania is often referred to when dealing with artists, musicians, inventors. For similar reasons, Romania has been the subject of notable tourist attractions, Romania derives from the Latin romanus, meaning citizen of Rome. The first known use of the appellation was attested in the 16th century by Italian humanists travelling in Transylvania, Moldavia, after the abolition of serfdom in 1746, the word rumân gradually fell out of use and the spelling stabilised to the form român. Tudor Vladimirescu, a leader of the early 19th century. The use of the name Romania to refer to the homeland of all Romanians—its modern-day meaning—was first documented in the early 19th century. The name has been officially in use since 11 December 1861, in English, the name of the country was formerly spelt Rumania or Roumania. Romania became the predominant spelling around 1975, Romania is also the official English-language spelling used by the Romanian government. The Neolithic-Age Cucuteni area in northeastern Romania was the region of the earliest European civilization. Evidence from this and other sites indicates that the Cucuteni-Trypillian culture extracted salt from salt-laden spring water through the process of briquetage
10.
Hydroelectricity
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Hydroelectricity is electricity produced from hydropower. In 2015 hydropower generated 16. 6% of the total electricity and 70% of all renewable electricity. Hydropower is produced in 150 countries, with the Asia-Pacific region generating 33 percent of global hydropower in 2013, China is the largest hydroelectricity producer, with 920 TWh of production in 2013, representing 16.9 percent of domestic electricity use. The cost of hydroelectricity is relatively low, making it a source of renewable electricity. The hydro station consumes no water, unlike coal or gas plants, the average cost of electricity from a hydro station larger than 10 megawatts is 3 to 5 U. S. cents per kilowatt-hour. With a dam and reservoir it is also a source of electricity since the amount produced by the station can be changed up or down very quickly to adapt to changing energy demands. Once a hydroelectric complex is constructed, the project produces no direct waste, Hydropower has been used since ancient times to grind flour and perform other tasks. In the mid-1770s, French engineer Bernard Forest de Bélidor published Architecture Hydraulique which described vertical-, by the late 19th century, the electrical generator was developed and could now be coupled with hydraulics. The growing demand for the Industrial Revolution would drive development as well, in 1878 the worlds first hydroelectric power scheme was developed at Cragside in Northumberland, England by William George Armstrong. It was used to power an arc lamp in his art gallery. The old Schoelkopf Power Station No.1 near Niagara Falls in the U. S. side began to produce electricity in 1881. The first Edison hydroelectric power station, the Vulcan Street Plant, began operating September 30,1882, in Appleton, Wisconsin, by 1886 there were 45 hydroelectric power stations in the U. S. and Canada. By 1889 there were 200 in the U. S. alone, at the beginning of the 20th century, many small hydroelectric power stations were being constructed by commercial companies in mountains near metropolitan areas. Grenoble, France held the International Exhibition of Hydropower and Tourism with over one million visitors, by 1920 as 40% of the power produced in the United States was hydroelectric, the Federal Power Act was enacted into law. The Act created the Federal Power Commission to regulate hydroelectric power stations on federal land, as the power stations became larger, their associated dams developed additional purposes to include flood control, irrigation and navigation. Federal funding became necessary for development and federally owned corporations, such as the Tennessee Valley Authority. Hydroelectric power stations continued to become larger throughout the 20th century, Hydropower was referred to as white coal for its power and plenty. Hoover Dams initial 1,345 MW power station was the worlds largest hydroelectric station in 1936
11.
Dam
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A dam is a barrier that impounds water or underground streams. Reservoirs created by not only suppress floods but also provide water for activities such as irrigation, human consumption, industrial use, aquaculture. Hydropower is often used in conjunction with dams to generate electricity, a dam can also be used to collect water or for storage of water which can be evenly distributed between locations. Dams generally serve the purpose of retaining water, while other structures such as floodgates or levees are used to manage or prevent water flow into specific land regions. The word dam can be traced back to Middle English, and before that, from Middle Dutch, the first known appearance of dam occurs in 1165. However, there is one village, Obdam, that is mentioned in 1120. The word seems to be related to the Greek word taphos, so the word should be understood as dike from dug out earth. The names of more than 40 places from the Middle Dutch era such as Amsterdam and Rotterdam, early dam building took place in Mesopotamia and the Middle East. Dams were used to control the level, for Mesopotamias weather affected the Tigris. The earliest known dam is the Jawa Dam in Jordan,100 kilometres northeast of the capital Amman and this gravity dam featured an originally 9-metre-high and 1 m-wide stone wall, supported by a 50 m-wide earth rampart. The structure is dated to 3000 BC, the Ancient Egyptian Sadd-el-Kafara Dam at Wadi Al-Garawi, located about 25 km south of Cairo, was 102 m long at its base and 87 m wide. The structure was built around 2800 or 2600 BC as a dam for flood control. During the Twelfth Dynasty in the 19th century BC, the Pharaohs Senosert III, Amenemhat III, two dams called Ha-Uar running east-west were built to retain water during the annual flood and then release it to surrounding lands. The lake called Mer-wer or Lake Moeris covered 1,700 km2 and is today as Berkat Qaroun. One of the wonders of the ancient world was the Great Dam of Marib in Yemen. Repairs were carried out during various periods, most important around 750 BC and these extensive works were not actually finalized until 325 AD and allowed the irrigation of 25,000 acres. By the mid-late 3rd century BC, an intricate water-management system within Dholavira in modern-day India was built, the system included 16 reservoirs, dams and various channels for collecting water and storing it. Eflatun Pınar is a Hittite dam and spring temple near Konya and it is thought to be from the time of the Hittite empire between the 15th and 13th century BC
12.
Iron Gate I Hydroelectric Power Station
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The Iron Gate I Hydroelectric Power Station is the largest dam on the Danube river and one of the largest hydro power plants in Europe. It is located on the Iron Gate gorge, between Romania and Serbia, the Romanian side of the power station produces approximately 5.24 TWh annually, while the Serbian side of the power station produces 5.65 TWh. The discrepancy in power output between the two halves is due to the generating equipment, while Romanias equipment is newer and thus more efficient, it is proving more unreliable, resulting in increased downtime for maintenance/repairs, and consequently lower annual power output overall. The project started in 1964 as a joint-venture between the governments of Romania and Yugoslavia for the construction of a dam on the Danube River which would serve both countries. The small inhabited island of Ada Kaleh was submerged during the construction, as the original turbines 30 years lifespan came to an end, in 1998 the Romanian half of the dam started a program of modernization. As part of program, the first of the turbines was stopped in 1999. By 2007 the program was completed and the Romanian half of the operations were back to full capacity. On the Serbian part of the dam, modernization started in July 2008, the units are being upgraded with the help of Russian company Power Machines from Saint Petersburg, as well as their subcontractors with the participation of eleven domestic companies. In addition to the upgrades, the Serbian side is planning on building a new, smaller power station, Iron Gate II Hydroelectric Power Station List of conventional hydroelectric power stations List of power stations in Romania List of power stations in Serbia Energy in Romania Description
13.
Iron Gate II Hydroelectric Power Station
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The Iron Gate II is a large dam on the Danube River, between Romania and Serbia. The project started in 1977 as a joint-venture between the governments of Romania and Yugoslavia for the construction of dam on the Danube River which would serve both countries. At the time of completion in 1984 the dam had 16 units generating a total of 432 MW, the Romanian side of the power station produces approximately 1.3 TWh per annum. The Serbian part of the station currently has 10 units with a nominal capacity of 27 MW each. The Serbian side of the station produces approximately 1.31 TWh per annum. At the celebration ceremony for the 27 years since the power stations deployment it was announced that production in 2011 reached 1.46 TWh despite bad weather conditions, current total power generation capacity of the power station is 591 MW. Ostrovul Mare Bridge Iron Gate I Hydroelectric Power Station List of power stations in Romania Energy in Romania Description The history of Iron Gate II
14.
Carpathian Mountains
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The Carpathian Mountains or Carpathians are a mountain range system forming an arc roughly 1,500 km long across Central and Eastern Europe, making them the second-longest mountain range in Europe. The Carpathians and their foothills also have many thermal and mineral waters, the Carpathians consist of a chain of mountain ranges that stretch in an arc from the Czech Republic in the northwest through Slovakia, Poland, Hungary and Ukraine to Romania and Serbia. The highest range within the Carpathians is the Tatras, on the border of Slovakia and Poland, the second-highest range is the Southern Carpathians in Romania, where the highest peaks exceed 2,500 m. The divisions of the Carpathians are usually in three sections, Western Carpathians — Czech Republic, Poland, and Slovakia. Eastern Carpathians — southeastern Poland, eastern Slovakia, Ukraine, Romania, the term Outer Carpathians is frequently used to describe the northern rim of the Western and Eastern Carpathians. The most important cities in or near the Carpathians are, Bratislava and Košice in Slovakia, Kraków in Poland, Cluj-Napoca, Sibiu and Braşov in Romania, and Uzhhorod in Ukraine. In modern times, the range is called Karpaty in Czech, Polish, Slovak and Карпати in Ukrainian, Carpați in Romanian, Karpaten in German, Kárpátok in Hungarian and Karpati or Карпати in Serbian. Although the toponym was recorded already by Ptolemy in the 2nd century CE, for instance, Havasok was its medieval Hungarian name, Rus and Romanian chronicles referred to it as Hungarian Mountains. The archaic Polish word karpa meant rugged irregularities, underwater obstacles/rocks, the more common word skarpa means a sharp cliff or other vertical terrain. In late Roman documents, the Eastern Carpathian Mountains were referred to as Montes Sarmatici, the Western Carpathians were called Carpates, a name that is first recorded in Ptolemys Geographia. In the Scandinavian Hervarar saga, which relates ancient Germanic legends about battles between Goths and Huns, the name Karpates appears in the predictable Germanic form as Harvaða fjöllum, inter Alpes Huniae et Oceanum est Polonia by Gervase of Tilbury, has described in his Otia Imperialia in 1211. Thirteenth- to fifteenth-century Hungarian documents named the mountains Thorchal, Tarczal or less frequently Montes Nivium, the northwestern Carpathians begin in Slovakia and southern Poland. They surround Transcarpathia and Transylvania in a semicircle, sweeping towards the southeast. The total length of the Carpathians is over 1,500 km, the highest altitudes of the Carpathians occur where they are widest. The Carpathians cover an area of 190,000 km2 and, after the Alps, although commonly referred to as a mountain chain, the Carpathians do not actually form an uninterrupted chain of mountains. Rather, they consist of several orographically and geologically distinctive groups, the Carpathians at their highest altitude are only as high as the middle region of the Alps, with which they share a common appearance, climate, and flora. The Carpathians are separated from the Alps by the Danube, the two ranges meet at only one point, the Leitha Mountains at Bratislava. The river also separates them from the Balkan Mountains at Orşova in Romania, the valley of the March and Oder separates the Carpathians from the Silesian and Moravian chains, which belong to the middle wing of the great Central Mountain System of Europe
15.
Balkan Mountains
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The Balkan mountain range is a mountain range in the eastern part of the Balkan Peninsula. The Balkan range runs 560 km from the Vrashka Chuka Peak on the border between Bulgaria and Serbia eastward through central Bulgaria to Cape Emine on the Black Sea, the highest peaks of the Balkan Mountains are in central Bulgaria. The highest peak is Botev at 2,376 m, which makes the range the third highest in the country, after Rila. The mountains are the source of the name of the Balkan Peninsula, the mountain range forms the watershed between the Black Sea and Aegean Sea catchment areas, with the exception of an area in west, where it is crossed by the spectacular Iskar Gorge. The karst relief determines the number of caves, including Magura, featuring the most important and extended European post-Palaeolithic cave painting, Ledenika, Saeva dupka, Bacho Kiro. The most notable formation are the Belogradchik Rocks in the west. There are several important protected areas, Central Balkan National Park, Vrachanski Balkan Nature Park, Bulgarka Nature Park and Sinite Kamani Nature Park, the Balkan Mountains are remarkable for their flora and fauna. Edelweiss grows there in the region of Kozyata stena, some of the most striking landscapes are included in the Central Balkan National Park with steep cliffs, the highest waterfalls in the Balkan Peninsula and lush vegetation. There are a number of important nature reserves such as Chuprene, Kozyata stena, most of Europes large mammals inhabit the area including the brown bear, wolf, boar, chamois and deer. The Balkan Mountains played a role in the history of Bulgaria since its foundation in 681 AD. It is believed the name was brought to the region in the 7th century by Bulgars who applied it to the area, in Bulgarian, the word balkan means mountain. It may have derived from the Persian bālkāneh or bālākhāna, meaning high, above, the name is still preserved in Central Asia with the Balkan Daglary and the Balkan Province of Turkmenistan. In Turkish balkan means a chain of wooded mountains In the Antiquity and the Middle Ages the mountains were known by their Thracian name, scholars consider that Haemus is believed that the name is derived from a Thracian word *saimon, mountain ridge. The name of the place where the range meets the Black Sea, other names used to refer to the mountains in different time periods include Aemon, Haemimons, Hem, Emus, the Slavonic Matorni gori and the Turkish Kodzhabalkan. Geologically, the Balkan Mountains are a part of the Alp-Himalayan chain that stretches across most of Europe. It can be divided into two parts, the main Balkan Chain and the Pre-Balkans to the north, which intrude slightly into the Danubian Plain, the range consists of around 30 portions called mountains. The Eastern Balkan Mountains from the Vratnik Pass to Cape Emine with a length of 160 kilometres, the eastern Balkan Mountains forms the lowest part of the range. The Balkan Mountains form a divide between the rivers flowing to the Danube in the north and those flowing to the Aegean Sea in the south
16.
Archaeology
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Archaeology, or archeology, is the study of human activity through the recovery and analysis of material culture. The archaeological record consists of artifacts, architecture, biofacts or ecofacts, Archaeology can be considered both a social science and a branch of the humanities. In North America, archaeology is considered a sub-field of anthropology, archaeologists study human prehistory and history, from the development of the first stone tools at Lomekwi in East Africa 3.3 million years ago up until recent decades. Archaeology as a field is distinct from the discipline of palaeontology, Archaeology is particularly important for learning about prehistoric societies, for whom there may be no written records to study. Prehistory includes over 99% of the human past, from the Paleolithic until the advent of literacy in societies across the world, Archaeology has various goals, which range from understanding culture history to reconstructing past lifeways to documenting and explaining changes in human societies through time. The discipline involves surveying, excavation and eventually analysis of data collected to learn more about the past, in broad scope, archaeology relies on cross-disciplinary research. Archaeology developed out of antiquarianism in Europe during the 19th century, Archaeology has been used by nation-states to create particular visions of the past. Nonetheless, today, archaeologists face many problems, such as dealing with pseudoarchaeology, the looting of artifacts, a lack of public interest, the science of archaeology grew out of the older multi-disciplinary study known as antiquarianism. Antiquarians studied history with attention to ancient artifacts and manuscripts. Tentative steps towards the systematization of archaeology as a science took place during the Enlightenment era in Europe in the 17th and 18th centuries, in Europe, philosophical interest in the remains of Greco-Roman civilization and the rediscovery of classical culture began in the late Middle Age. Antiquarians, including John Leland and William Camden, conducted surveys of the English countryside, one of the first sites to undergo archaeological excavation was Stonehenge and other megalithic monuments in England. John Aubrey was a pioneer archaeologist who recorded numerous megalithic and other monuments in southern England. He was also ahead of his time in the analysis of his findings and he attempted to chart the chronological stylistic evolution of handwriting, medieval architecture, costume, and shield-shapes. Excavations were also carried out in the ancient towns of Pompeii and Herculaneum and these excavations began in 1748 in Pompeii, while in Herculaneum they began in 1738. The discovery of entire towns, complete with utensils and even human shapes, however, prior to the development of modern techniques, excavations tended to be haphazard, the importance of concepts such as stratification and context were overlooked. The father of archaeological excavation was William Cunnington and he undertook excavations in Wiltshire from around 1798, funded by Sir Richard Colt Hoare. Cunnington made meticulous recordings of neolithic and Bronze Age barrows, one of the major achievements of 19th century archaeology was the development of stratigraphy. The idea of overlapping strata tracing back to successive periods was borrowed from the new geological and paleontological work of scholars like William Smith, James Hutton, the application of stratigraphy to archaeology first took place with the excavations of prehistorical and Bronze Age sites
17.
The Times
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The Times is a British daily national newspaper based in London, England. It began in 1785 under the title The Daily Universal Register, the Times and its sister paper The Sunday Times are published by Times Newspapers, since 1981 a subsidiary of News UK, itself wholly owned by News Corp. The Times and The Sunday Times do not share editorial staff, were founded independently and have only had common ownership since 1967 and its news and its editorial comment have in general been carefully coordinated, and have at most times been handled with an earnest sense of responsibility. While the paper has admitted some trivia to its columns, its emphasis has been on important public affairs treated with an eye to the best interests of Britain. To guide this treatment, the editors have for long periods been in touch with 10 Downing Street. In these countries, the newspaper is often referred to as The London Times or The Times of London, although the newspaper is of national scope, in November 2006 The Times began printing headlines in a new font, Times Modern. The Times was printed in broadsheet format for 219 years, the Sunday Times remains a broadsheet. The Times had a daily circulation of 446,164 in December 2016, in the same period. An American edition of The Times has been published since 6 June 2006 and it has been heavily used by scholars and researchers because of its widespread availability in libraries and its detailed index. A complete historical file of the paper, up to 2010, is online from Gale Cengage Learning. The Times was founded by publisher John Walter on 1 January 1785 as The Daily Universal Register, Walter had lost his job by the end of 1784 after the insurance company where he was working went bankrupt because of the complaints of a Jamaican hurricane. Being unemployed, Walter decided to set a new business up and it was in that time when Henry Johnson invented the logography, a new typography that was faster and more precise. Walter bought the patent and to use it, he decided to open a printing house. The first publication of the newspaper The Daily Universal Register in Great Britain was 1 January 1785, unhappy because people always omitted the word Universal, Ellias changed the title after 940 editions on 1 January 1788 to The Times. In 1803, Walter handed ownership and editorship to his son of the same name, the Times used contributions from significant figures in the fields of politics, science, literature, and the arts to build its reputation. For much of its life, the profits of The Times were very large. Beginning in 1814, the paper was printed on the new steam-driven cylinder press developed by Friedrich Koenig, in 1815, The Times had a circulation of 5,000. Thomas Barnes was appointed editor in 1817
18.
Polish language
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Polish is a West Slavic language spoken primarily in Poland and is the native language of the Poles. It belongs to the Lechitic subgroup of the West Slavic languages, Polish is the official language of Poland, but it is also used throughout the world by Polish minorities in other countries. It is one of the languages of the European Union. Its written standard is the Polish alphabet, which has 9 additions to the letters of the basic Latin script, Polish is closely related to Kashubian, Silesian, Upper Sorbian, Lower Sorbian, Czech and Slovak. It is also the second most widely spoken Slavic language, after Russian, in history, Polish is known to be an important language, both diplomatically and academically in Central and Eastern Europe. Today, Polish is spoken by over 38.5 million people as their first language in Poland. It is also spoken as a language in western parts of Belarus and Ukraine, west and central Lithuania, as well as the northern parts of the Czech Republic. There are 55 million Polish language speakers around the world, Polish began to emerge as a distinct language around the 10th century, the process largely triggered by the establishment and development of the Polish state. With Christianity, Poland also adopted the Latin alphabet, which made it possible to write down Polish, the precursor to modern Polish is the Old Polish language. Ultimately, Polish is thought to descend from the unattested Proto-Slavic language, Poland is the most linguistically homogeneous European country, nearly 97% of Polands citizens declare Polish as their first language. Elsewhere, Poles constitute large minorities in Lithuania, Belarus, Polish is the most widely used minority language in Lithuanias Vilnius County and is found elsewhere in southeastern Lithuania. There are significant numbers of Polish speakers among Polish emigrants and their descendants in many other countries, in the United States, Polish Americans number more than 11 million but most of them cannot speak Polish fluently. The largest concentrations of Polish speakers reported in the census were found in three states, Illinois, New York, and New Jersey. Enough people in these areas speak Polish that PNC Financial Services offer services available in Polish at all of their machines in addition to English and Spanish. According to the 2011 census there are now over 500,000 people in England, in Canada, there is a significant Polish Canadian population, There are 242,885 speakers of Polish according to the 2006 census, with a particular concentration in Toronto and Montreal. The geographical distribution of the Polish language was affected by the territorial changes of Poland immediately after World War II. Poles settled in the Recovered Territories in the west and north and this tendency toward a homogeneity also stems from the vertically integrated nature of the authoritarian Polish Peoples Republic. The inhabitants of different regions of Poland still speak standard Polish somewhat differently, first-language speakers of Polish have no trouble understanding each other, and non-native speakers may have difficulty distinguishing regional variations
19.
Byzantine Greek
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From the 7th century onwards, Greek was the only language of administration and government in the Byzantine Empire. This stage of language is described as Byzantine Greek. The study of the Medieval Greek language and literature is a branch of Byzantine Studies, or Byzantinology, however, this approach is rather arbitrary as it is more an assumption of political as opposed to cultural and linguistic developments. Indeed, by time the spoken language, particularly pronunciation, had already shifted towards modern forms. Medieval Greek is the link between this vernacular, known as Koine Greek, and the Modern Greek language. With the transfer of the Roman imperial court to Byzantium between 324 and 330, the centre of the Roman Empire was moved into an area where Greek was the dominant language. At first, Latin remained the language of both the court and the army and it was used for documents, but its influence soon waned. From the beginning of the 6th century, amendments to the law were written in Greek. Furthermore, parts of the Roman Corpus Iuris Civilis were gradually translated into Greek, under the rule of Emperor Heraclius, who also assumed the Greek title Basileus in 629, Greek became the official language of the Eastern Roman Empire. This was in spite of the fact that the inhabitants of the empire still considered themselves Romaioi until its end in 1453, the number of those who were able to communicate in Greek may have been far higher. In any case, all cities of the Eastern Roman Empire were strongly influenced by the Greek language, alexandria, a center of Greek culture and language, fell to the Arabs in 642. During the seventh and eighth centuries, Greek was replaced by Arabic as a language in conquered territories such as Egypt. Thus, the use of Greek declined early on in Syria, Egypt, from the late 11th century onwards, the interior of Anatolia was invaded by Seljuq Turks, who advanced westwards. Language varieties after 1453 are referred to as Modern Greek, as early as in the Hellenistic period, there was a tendency towards a state of diglossia between the Attic literary language and the constantly developing vernacular Koiné. By late antiquity, the gap had become impossible to ignore, written literature reflecting this demotic Greek begins to appear around 1100. Among the preserved literature in the Attic literary language, various forms of historiography take a prominent place and they comprise chronicles as well as classicist, contemporary works of historiography, theological documents, and saints lives. Poetry can be found in the form of hymns and ecclesiastical poetry, many of the Byzantine emperors were active writers themselves and wrote chronicles or works on the running of the Byzantine state and strategic or philological works. Furthermore, letters, legal texts, and numerous registers and lists in Medieval Greek exist and these are influenced by the vernacular language of their time in choice of words and idiom, but largely follow the models of written Koine in their morphology and syntax
20.
Whirlpool
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A whirlpool is a body of swirling water produced by the meeting of opposing currents. The vast majority of whirlpools are not very powerful and very small whirlpools can easily be seen when a bath or a sink is draining, more powerful ones in seas or oceans may be termed maelstroms. Vortex is the term for any whirlpool that has a downdraft. Smaller whirlpools also appear at the base of waterfalls and can also be observed downstream from manmade structures such as weirs. In the case of waterfalls, like Niagara Falls, these whirlpools can be quite strong. Moskstraumen is a system of whirlpools in the open seas in the Lofoten Islands off the Norwegian coast. It is the second strongest whirlpool in the world with flow currents reaching speeds as high as 32 km/h and it finds mention in several books and movies. The maelstrom of Saltstraumen is the Earths strongest maelstrom, and is located close to the Arctic Circle,33 km round the bay on the Highway 17, south-east of the city of Bodø, Norway. The strait at its narrowest is 150 m in width and water funnels through the four times a day. It is estimated that 400 million cubic meters of water passes the narrow strait during this event, the water is creamy in colour and most turbulent during high tide, which is witnessed by thousands of tourists. It reaches speeds of 40 km/h, with speed of about 13 km/h. As navigation is dangerous in this only a small slot of time is available for large ships to pass through. Its impressive strength is caused by the worlds strongest tide occurring in the location during the new. A narrow channel of 3 km length connects the outer Saltfjord with its extension, the Corryvreckan is a narrow strait between the islands of Jura and Scarba, in Argyll and Bute, on the northern side of the Gulf of Corryvreckan, Scotland. It is the third-largest whirlpool in the world, though it was initially classified as non-navigable by the British navy it was later categorized as extremely dangerous. A documentary team from Scottish independent producers Northlight Productions once threw a mannequin into the Corryvreckan with a life jacket, the mannequin was swallowed and spat up far down current with a depth gauge reading of 262 metres with evidence of being dragged along the bottom for a great distance. Old Sow whirlpool is located between Deer Island, New Brunswick, Canada, and Moose Island, Eastport, Maine and it is given the epithet pig-like as it makes a screeching noise when the vortex is at its full fury. The smaller whirlpools around this Old Sow are known as Piglets. the Naruto whirlpools are located in the Naruto Strait near Awaji Island in Japan, which have speeds of 26 km/h
21.
Trajan's Bridge
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Trajans Bridge or Bridge of Apollodorus over the Danube was a Roman segmental arch bridge, the first bridge to be built over the lower Danube. Though it was functional for a few decades, for more than 1,000 years it was the longest arch bridge in both total and span length. The bridge was constructed in 105 AD by instruction of Emperor Trajan by Greek architect Apollodorus of Damascus for the deployment of Roman troops during the conquest of Dacia. The bridge was situated East of the Iron Gates, near the cities of Drobeta-Turnu Severin in Romania. Its construction was ordered by the Emperor Trajan as a route for the Roman legions fighting in Dacia. The structure was 1,135 m long,15 m wide, at each end was a Roman castrum, each built around an entrance, so that crossing the bridge was possible only by walking through the camps. The bridges engineer, Apollodorus of Damascus, used wooden arches, each spanning 38 m, set on twenty masonry pillars made of bricks, mortar and it was built unusually quickly, employing the construction of a wooden caisson for each pier. A Roman memorial plaque,4 metres wide and 1.75 metres high, in 1972, when the Iron Gate I Hydroelectric Power Station was built, the plaque was moved from its original location, and lifted to the present place. The Tabula Traiana was declared a Monument of Culture of Exceptional Importance in 1979, the wooden superstructure of the bridge was dismantled by Trajans successor, Hadrian, in order to protect the empire from barbarian invasions from the North. The twenty pillars were still visible in 1856, when the level of the Danube hit a record low, in 1906, the Commission of the Danube decided to destroy two of the pillars that were obstructing navigation. In 1932, there were 16 pillars remaining underwater, but in 1982 only 12 were mapped by archaeologists, only the entrance pillars are now visible on either bank of the Danube. Entwurf, Bau und Unterhaltung von Brücken im Donauraum,3, internationale Donaubrückenkonferenz, 29–30 October, Regensburg, pp. 401–409 Galliazzo, Vittorio, I ponti romani. Le pont de Trajan à Drobeta-Turnu Severin, Les ponts romains du Bas-Danube, Bibliotheca Historica Romaniae Études,51, Bucharest, Editura Academiei Republicii Socialiste România, pp. 47–134 Tudor, the Current Results of Underwater Archaeological Research, Istros, 119–130 Ранко Јаковљевић
22.
Moldova Veche
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Moldova Nouă is a town in southwestern Romania in Caraș-Severin County, in an area known as Clisura Dunării. It is located on the shores of the river Danube, in 2002, Moldova Nouă had a population of 13,917. The town administers three villages, Măcești, Moldova Veche and Moldovița, at the 2011 census,81. 2% of inhabitants were Romanians,12. 8% Serbs,3. 2% Roma,1. 3% Hungarians and 0. 8% Czechs. At the 2002 census,88. 4% were Romanian Orthodox,4. 5% Baptist, 4% Roman Catholic, emilijan Josimović, Serbian urbanist Iasmin Latovlevici, Romanian footballer Mihăiță Pleșan, Romanian footballer Clara Vădineanu, Romanian handballer
23.
Middle Ages
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In the history of Europe, the Middle Ages or Medieval Period lasted from the 5th to the 15th century. It began with the fall of the Western Roman Empire and merged into the Renaissance, the Middle Ages is the middle period of the three traditional divisions of Western history, classical antiquity, the medieval period, and the modern period. The medieval period is subdivided into the Early, High. Population decline, counterurbanisation, invasion, and movement of peoples, the large-scale movements of the Migration Period, including various Germanic peoples, formed new kingdoms in what remained of the Western Roman Empire. In the seventh century, North Africa and the Middle East—once part of the Byzantine Empire—came under the rule of the Umayyad Caliphate, although there were substantial changes in society and political structures, the break with classical antiquity was not complete. The still-sizeable Byzantine Empire survived in the east and remained a major power, the empires law code, the Corpus Juris Civilis or Code of Justinian, was rediscovered in Northern Italy in 1070 and became widely admired later in the Middle Ages. In the West, most kingdoms incorporated the few extant Roman institutions, monasteries were founded as campaigns to Christianise pagan Europe continued. The Franks, under the Carolingian dynasty, briefly established the Carolingian Empire during the later 8th, the Crusades, first preached in 1095, were military attempts by Western European Christians to regain control of the Holy Land from Muslims. Kings became the heads of centralised nation states, reducing crime and violence, intellectual life was marked by scholasticism, a philosophy that emphasised joining faith to reason, and by the founding of universities. Controversy, heresy, and the Western Schism within the Catholic Church paralleled the conflict, civil strife. Cultural and technological developments transformed European society, concluding the Late Middle Ages, the Middle Ages is one of the three major periods in the most enduring scheme for analysing European history, classical civilisation, or Antiquity, the Middle Ages, and the Modern Period. Medieval writers divided history into periods such as the Six Ages or the Four Empires, when referring to their own times, they spoke of them as being modern. In the 1330s, the humanist and poet Petrarch referred to pre-Christian times as antiqua, leonardo Bruni was the first historian to use tripartite periodisation in his History of the Florentine People. Bruni and later argued that Italy had recovered since Petrarchs time. The Middle Ages first appears in Latin in 1469 as media tempestas or middle season, in early usage, there were many variants, including medium aevum, or middle age, first recorded in 1604, and media saecula, or middle ages, first recorded in 1625. The alternative term medieval derives from medium aevum, tripartite periodisation became standard after the German 17th-century historian Christoph Cellarius divided history into three periods, Ancient, Medieval, and Modern. The most commonly given starting point for the Middle Ages is 476, for Europe as a whole,1500 is often considered to be the end of the Middle Ages, but there is no universally agreed upon end date. English historians often use the Battle of Bosworth Field in 1485 to mark the end of the period
24.
Golubac
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Golubac is a village and municipality located in the Braničevo District of the eastern Serbia. It is situated on the side of the Danube river. It is bordered by Romania to the east, Veliko Gradište to the west, the population of the village is 1,655 and the population of the municipality is 8,161. In Serbian, the town is known as Golubac, in Romanian as Golumbacu Mare or Columbaci, in Hungarian as Galambóc, in German as Taubenberg and in Turkish as Güvercinlik which means dovecote. The name Golubac is derived from golub, which is Serbian for pigeon or dove and its historical names were Columbria, in Latin, as a contraction of Columbaria that means city of pigeons, and as a city derived from Cuppae during pre-Roman times. It was a stronghold called Cuppae during Roman and Early Byzantine times, due to many nearby archeological sites and the Đerdap national park, the village is a popular tourist, fishing and sailing destination. The archeological sites include the remnants of one of Roman Emperor Trajans tables near Trajans Bridge, found along his road through the Danubes Iron Gates, Golubac fortress,4 km downstream, is from the 14th century and also of interest. The fortress was the scene of a battle against the Turks in 1428, from 1929 to 1941, Golubac was part of the Morava Banovina of the Kingdom of Yugoslavia. The villages quay along the Danube river is popular for more relaxed hiking, Golubac has become a famous sailing site. The Sailing Center of the Sailing Association of Serbia, which the Serbian National Team uses for ground preparations before every big sailing event, is located in Golubac, one of the events is a sailing Regatta, which is traditionally held in August. During the summer, the Center holds an Optimist Class sailing camp, where beginners can learn from the best Serbian sailors and their international guests
25.
Wallachia
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Wallachia or Walachia is a historical and geographical region of Romania. It is situated north of the Lower Danube and south of the Southern Carpathians, Wallachia is traditionally divided into two sections, Muntenia and Oltenia. Wallachia as a whole is referred to as Muntenia through identification with the larger of the two traditional sections. In 1417, Wallachia accepted the suzerainty of the Ottoman Empire, in 1859, Wallachia united with Moldavia to form the United Principalities, which adopted the name Romania in 1866 and officially became the Kingdom of Romania in 1881. In the Early Middle Ages, in Slavonic texts, the name of Zemli Ungro-Vlahiskoi was also used as a designation for its location, official designations of the state were Muntenia and Țara Românească. The traditional Hungarian name for Wallachia is Havasalföld, or literally Snowy Lowlands, in Ottoman Turkish, the term Eflâk Prensliği, or simply Eflâk افلاق, appears. Mavrovlachi is another name of the Balkan Vlachs or Aromanians, both names could come from a confusion, Kara Iflak, the Turkish name of Wallachia, means land of Wallachians, but later kara was misconstrued as kara. Later, the Turks renamed Moldavia and Wallachia as Kara Iflak and Ak Iflak according to the Turkish cardinal points symbolism, north is symbolized by black, and west is symbolized by white. Ardeal/Erdel was the name of Transylvania, and Kara Iflak, Northern Wallachia was either Wallachia, north of the Balkan territories inhabited by Vlachs, the second explanation is typologically better. In the Second Dacian War western Oltenia became part of the Roman province of Dacia, the Roman limes was initially built along the Olt River, before being moved slightly to the east in the 2nd century—during which time it stretched from the Danube up to Rucăr in the Carpathians. The Roman line fell back to the Olt in 245 and, in 271, in 328, the Romans built a bridge between Sucidava and Oescus which indicates that there was a significant trade with the peoples north of the Danube. A short period of Roman rule in the area is attested under Emperor Constantine I, the period of Goth rule ended when the Huns arrived in the Pannonian Plain and, under Attila, attacked and destroyed some 170 settlements on both sides of the Danube. Wallachia was under the control of the First Bulgarian Empire from its establishment in 681, in 1241, during the Mongol invasion of Europe, Cuman domination was ended—a direct Mongol rule over Wallachia was not attested, but it remains probable. His successor was his brother Bărbat.1334, Basarab was succeeded by Nicolae Alexandru, followed by Vladislav I. Under Radu I and his successor Dan I, the realms in Transylvania, as the entire Balkan Peninsula became an integral part of the growing Ottoman Empire, Wallachia became engaged in frequent confrontations in the final years of Mircea the Elders reign. Mircea initially defeated the Ottomans in several battles, driving away from Dobruja and briefly extending his rule to the Danube Delta, Dobruja. He swung between alliances with Sigismund of Hungary and Jagiellon Poland, and accepted a treaty with the Ottomans in 1417, after Mehmed I took control of Turnu Măgurele. The two ports remained part of the Ottoman state, with interruptions, until 1829
26.
Maritime transport
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Ship transport is watercraft carrying people or goods. Freight transport has been achieved widely by sea throughout recorded history, although the importance of sea travel for passengers has decreased due to aviation, it is effective for short trips and pleasure cruises. Transport by water is cheaper than transport by air, despite fluctuating exchange rates, ship transport can be realized over any distance by boat, ship, sailboat or barge, over oceans and lakes, through canals or along rivers. Virtually any material can be moved by water, however, water transport becomes impractical when material delivery is highly time-critical such as types of perishable produce. Containerization revolutionized ship transport starting in the 1970s, general cargo includes goods packaged in boxes, cases, pallets, and barrels. When a cargo is carried in more than one mode, it is intermodal or co-modal, a nations shipping fleet consists of the ships operated by civilian crews to transport passengers or cargo from one place to another. Ores, Coal, and grains can travel along the rivers of the American midwest to Pittsburgh, professional mariners are merchant seaman, merchant sailor, and merchant mariner, or simply seaman, sailor, or mariners. The terms seaman or sailor may refer to a member of a countrys navy, according to the 2005 CIA World Factbook, the total number of merchant ships of at least 1,000 gross register tons in the world was 30,936. In 2010, it was 38,988, an increase of 26%, statistics for individual countries are available at the list of merchant navy capacity by country. A ships complement can be divided into four categories, the department, the engineering department, the stewards department. Officer positions in the department include but not limited to, Master and his Chief, Second. The official classifications for unlicensed members of the department are Able Seaman. Their time on board is spent learning the operations and tasks of life on a merchant vessel. A ships engineering department consists of the members of a crew that operate and maintain the propulsion. Marine Engineering staff also deal with the Hotel facilities on board, notably the sewage, lighting, air conditioning, on LPG and LNG tankers however, a cargo engineer works with the deck department during cargo operations, as well as being a watchkeeping engineer. Other possible positions include Motorman, Machinist, Electrician, Refrigeration Engineer, engine Cadets are trainee engineers who are completing sea time necessary before they can obtain a watchkeeping license. A typical Stewards department for a ship would be composed of a Chief Steward, a Chief Cook. All three positions are filled by unlicensed personnel
27.
Rudder
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A rudder is a primary control surface used to steer a ship, boat, submarine, hovercraft, aircraft, or other conveyance that moves through a fluid medium. On an aircraft the rudder is used primarily to counter adverse yaw, a rudder operates by redirecting the fluid past the hull or fuselage, thus imparting a turning or yawing motion to the craft. In basic form, a rudder is a plane or sheet of material attached with hinges to the crafts stern, tail. Often rudders are shaped so as to minimize hydrodynamic or aerodynamic drag, on simple watercraft, a tiller—essentially, a stick or pole acting as a lever arm—may be attached to the top of the rudder to allow it to be turned by a helmsman. In larger vessels, cables, pushrods, or hydraulics may be used to link rudders to steering wheels, in typical aircraft, the rudder is operated by pedals via mechanical linkages or hydraulics. Generally, a rudder is part of the apparatus of a boat or ship that is fastened outside the hull, that is denoting all different types of oars, paddles. More specifically, the gear of ancient vessels can be classified into side-rudders and stern-mounted rudders. A third term, steering oar, can denote both types, in a Mediterranean context, side-rudders are more specifically called quarter-rudders as the later term designates more exactly the place where the rudder was mounted. Stern-mounted rudders are uniformly suspended at the back of the ship in a central position. S, a steering oar was used at this time because the rudder had not yet been invented. With a single sail, a frequent movement of the oar was required to steer a straight course. The steering oar or steering board is an oar or board to control the direction of a ship or other watercraft prior to the invention of the rudder. It is normally attached to the side in larger vessels, though in smaller ones it is rarely, if ever. Rowing oars set aside for steering appeared on large Egyptian vessels long before the time of Menes, in the Old Kingdom as much as five steering oars are found on each side of passenger boats. The tiller, at first a small pin run through the stock of the steering oar, both the tiller and the introduction of an upright steering post abaft reduced the usual number of necessary steering oars to one each side. In Iran, oars mounted on the side of ships for steering are documented from the 3rd millennium BCE in artwork, wooden models, the strength of the steering oar lay in its combination of effectiveness, adaptability and simpleness. Roman quarter steering oar mounting systems survived mostly intact through the medieval period, by the first half of the 1st century AD, steering gear mounted on the stern were also quite common in Roman river and harbour craft as proved from reliefs and archaeological finds. A tomb plaque of Hadrianic age shows a harbour tug boat in Ostia with a long stern-mounted oar for better leverage, interestingly, the boat already featured a spritsail, adding to the mobility of the harbour vessel. Further attested Roman uses of stern-mounted steering oars includes barges under tow, transport ships for wine casks, also, the well-known Zwammerdam find, a large river barge at the mouth of the Rhine, featured a large steering gear mounted on the stern
28.
Waterfall
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A waterfall is a place where water flows over a vertical drop or a series of drops in the course of a stream or river. Waterfalls also occur where meltwater drops over the edge of an iceberg or ice shelf. Waterfalls are commonly formed in the course of a river. At these times the channel is narrow and deep. When the river courses over resistant bedrock, erosion happens slowly, as the watercourse increases its velocity at the edge of the waterfall, it plucks material from the riverbed. Whirlpools created in the turbulence as well as sand and stones carried by the increase the erosion capacity. This causes the waterfall to carve deeper into the bed and to recede upstream, often over time, the waterfall will recede back to form a canyon or gorge downstream as it recedes upstream, and it will carve deeper into the ridge above it. The rate of retreat for a waterfall can be as high as one, eventually, the outcropping, more resistant cap rock will collapse under pressure to add blocks of rock to the base of the waterfall. Waterfalls normally form in an area due to erosion. After a long period of being formed, the water falling off the ledge will retreat. Eventually, as the pit grows deeper, the waterfall collapses to be replaced by a steeply sloping stretch of river bed, a river sometimes flows over a large step in the rocks that may have been formed by a fault line. Waterfalls can occur along the edge of a trough, where a stream or river flowing into a glacier continues to flow into a valley after the glacier has receded or melted. The large waterfalls in Yosemite Valley are examples of this phenomenon, another reason hanging valleys may form is where two rivers join and one is flowing faster than the other. Waterfalls can be grouped into ten classes based on the average volume of water present on the fall using a logarithmic scale. Class 10 waterfalls include Niagara Falls, Paulo Afonso Falls and Khone Falls, young Wrote Waterfalls, form and process this work made waterfalls a much more serious topic for research for modern Geoscientists. Ledge waterfall, Water descends vertically over a cliff, maintaining partial contact with the bedrock. Block/Sheet. Classical, Ledge waterfalls where fall height is equal to stream width. Curtain, Ledge waterfalls which descend over a larger than the width of falling water stream
29.
Locomotive
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A locomotive or engine is a rail transport vehicle that provides the motive power for a train. A locomotive has no payload capacity of its own, and its purpose is to move the train along the tracks. In contrast, some trains have self-propelled payload-carrying vehicles and these are not normally considered locomotives, and may be referred to as multiple units, motor coaches or railcars. The use of these vehicles is increasingly common for passenger trains. Traditionally, locomotives pulled trains from the front, however, push-pull operation has become common, where the train may have a locomotive at the front, at the rear, or at each end. Prior to locomotives, the force for railroads had been generated by various lower-technology methods such as human power, horse power. The first successful locomotives were built by Cornish inventor Richard Trevithick, in 1804 his unnamed steam locomotive hauled a train along the tramway of the Penydarren ironworks, near Merthyr Tydfil in Wales. Although the locomotive hauled a train of 10 long tons of iron and 70 passengers in five wagons over nine miles, the locomotive only ran three trips before it was abandoned. Trevithick built a series of locomotives after the Penydarren experiment, including one which ran at a colliery in Tyneside in northern England, the first commercially successful steam locomotive was Matthew Murrays rack locomotive, Salamanca, built for the narrow gauge Middleton Railway in 1812. This was followed in 1813 by the Puffing Billy built by Christopher Blackett and William Hedley for the Wylam Colliery Railway, Puffing Billy is now on display in the Science Museum in London, the oldest locomotive in existence. In 1814 George Stephenson, inspired by the locomotives of Trevithick. He built the Blücher, one of the first successful flanged-wheel adhesion locomotives, Stephenson played a pivotal role in the development and widespread adoption of steam locomotives. His designs improved on the work of the pioneers, in 1825 he built the Locomotion for the Stockton and Darlington Railway, north east England, which became the first public steam railway. In 1829 he built The Rocket which was entered in and won the Rainhill Trials and this success led to Stephenson establishing his company as the pre-eminent builder of steam locomotives used on railways in the United Kingdom, the United States and much of Europe. The first inter city passenger railway, Liverpool and Manchester Railway, opened in 1830, there are a few basic reasons to isolate locomotive train power, as compared to self-propelled vehicles. Maximum utilization of power cars Separate locomotives facilitate movement of costly motive power assets as needed, flexibility Large locomotives can substitute for small locomotives when more power is required, for example, where grades are steeper. As needed, a locomotive can be used for freight duties. Obsolescence cycles Separating motive power from payload-hauling cars enables replacement without affecting the other, to illustrate, locomotives might become obsolete when their associated cars did not, and vice versa
30.
Sluice
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A sluice is a water channel controlled at its head by a gate. A mill race, leet, flume, penstock or lade is a sluice channelling water toward a water mill, the terms sluice, sluice gate, knife gate, and slide gate are used interchangeably in the water and wastewater control industry. A sluice gate is traditionally a wood or metal barrier sliding in grooves that are set in the sides of the waterway, Sluice gates commonly control water levels and flow rates in rivers and canals. They are also used in treatment plants and to recover minerals in mining operations. Sluice gate refers to a gate allowing water to flow under it. When a sluice is lowered, water may spill over the top, usually, a mechanism drives the sluice up or down. This may be a simple, hand-operated, chain pulled/lowered, worm drive or rack-and-pinion drive, flap sluice gate A fully automatic type, controlled by the pressure head across it, operation is similar to that of a check valve. It is a gate hinged at the top, when pressure is from one side, the gate is kept closed, a pressure from the other side opens the sluice when a threshold pressure is surpassed. Vertical rising sluice gate A plate sliding in the vertical direction, radial sluice gate A structure, where a small part of a cylindrical surface serves as the gate, supported by radial constructions going through the cylinders radius. On occasion, a counterweight is provided, rising sector sluice gate Also a part of a cylindrical surface, which rests at the bottom of the channel and rises by rotating around its centre. Needle sluice A sluice formed by a number of thin needles held against a solid frame through water pressure as in a needle dam. The gates of a Guillotine lock work in a way similar to a sluice gate, in the mountains of the United States, sluices transported logs from steep hillsides to downslope sawmill ponds or yarding areas. Nineteenth-century logging was traditionally a winter activity for men who spent summers working on farms, where there were freezing nights, water might be applied to logging sluices every night so a fresh coating of slippery ice would reduce friction of logs placed in the sluice the following morning. Sluice boxes are used in the recovery of black sands, gold. They may be small-scale, as used in prospecting, or much larger, as in commercial operations, typical sluices have transverse riffles over a carpet, which trap the heavy minerals, gemstones, and other valuable minerals. Cast Iron Cast iron has been popular when constructing sluice gates for years and this material is great at keeping the strength needed when dealing with powerful water levels. Stainless Steel Stainless steel in most cases is lighter than the older cast iron material, fibre-reinforced plastic Rather recently a new technologies such as fibre-reinforced plastic are being used to build sluices. This modern technology has many of the attributes as the older ways while bringing in new attributes such as corrosion resistance, in the Somerset Levels, sluice gates are known as clyse or clyce
31.
Lock (water navigation)
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A lock is a device used for raising and lowering boats, ships and other watercraft between stretches of water of different levels on river and canal waterways. Locks are used to make a more easily navigable, or to allow a canal to cross land that is not level. Later canals used more and larger locks to allow a direct route to be taken. Since 2016 the largest lock worldwide is the Kieldrecht Lock in the Port of Antwerp, a pound lock is a type of lock that is used almost exclusively nowadays on canals and rivers. A pound lock has a chamber with gates at both ends that control the level of water in the pound, in contrast, an earlier design with a single gate was known as a flash lock. Pound locks were first used in medieval China during the Song Dynasty, having been pioneered by the government official and engineer Qiao Weiyue in 984. The gates were hanging gates, when they were closed the water accumulated like a tide until the level was reached. The water level could differ by 4 feet or 5 feet at each lock, in medieval Europe a sort of pound lock was built in 1373 at Vreeswijk, Netherlands. This pound lock serviced many ships at once in a large basin, yet the first true pound lock was built in 1396 at Damme near Bruges, Belgium. A famous civil engineer of pound locks in Europe was the Italian Bertola da Novate, who constructed 18 of them on the Naviglio di Bereguardo between the years 1452 and 1458. When a stretch of river is navigable, a lock is sometimes required to bypass an obstruction such as a rapid, dam. In large scale river navigation improvements, weirs and locks are used together, a river improved by these means is often called a Waterway or River Navigation. Sometimes a river is made entirely non-tidal by constructing a sea lock directly into the estuary, in more advanced river navigations, more locks are required. Where a longer cut bypasses a stretch of river, the upstream end of the cut will often be protected by a flood lock. The longer the cut, the greater the difference in level between start and end of the cut, so that a very long cut will need additional locks along its length. At this point, the cut is, in effect, a canal, Early completely artificial canals, across fairly flat countryside, would get round a small hill or depression by simply detouring around it. However, locks continued to be built to supplement these solutions, all pound locks have three elements, A watertight chamber connecting the upper and lower canals, and large enough to enclose one or more boats. The position of the chamber is fixed, but its level can vary
32.
Belgrade
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Belgrade is the capital and largest city of Serbia. It is located at the confluence of the Sava and Danube rivers and its name translates to White city. The urban area of the City of Belgrade has a population of 1.34 million, one of the most important prehistoric cultures of Europe, the Vinča culture, evolved within the Belgrade area in the 6th millennium BC. In antiquity, Thraco-Dacians inhabited the region, and after 279 BC Celts conquered the city and it was conquered by the Romans during the reign of Augustus, and awarded city rights in the mid-2nd century. In 1521, Belgrade was conquered by the Ottoman Empire and became the seat of the Sanjak of Smederevo and it frequently passed from Ottoman to Habsburg rule, which saw the destruction of most of the city during the Austro-Ottoman wars. Belgrade was again named the capital of Serbia in 1841, northern Belgrade remained the southernmost Habsburg post until 1918, when the city was reunited. As a strategic location, the city was battled over in 115 wars, Belgrade was the capital of Yugoslavia from its creation in 1918, to its final dissolution in 2006. Belgrade has an administrative status within Serbia and it is one of five statistical regions of Serbia. Its metropolitan territory is divided into 17 municipalities, each with its own local council, City of Belgrade covers 3. 6% of Serbias territory, and 22. 5% of the countrys population lives within its administrative limits. It is classified as a Beta- global city, chipped stone tools found at Zemun show that the area around Belgrade was inhabited by nomadic foragers in the Palaeolithic and Mesolithic eras. Some of these belong to the Mousterian industry, which are associated with Neanderthals rather than modern humans. Aurignacian and Gravettian tools have also discovered there, indicating occupation between 50,000 and 20,000 years ago. The first farming people to settle in the region are associated with the Neolithic Starčevo culture, there are several Starčevo sites in and around Belgrade, including the eponymous site of Starčevo. The Starčevo culture was succeeded by the Vinča culture, a more sophisticated farming culture that grew out of the earlier Starčevo settlements which is named for a site in the Belgrade region. Evidence of early knowledge about Belgrades geographical location comes from ancient myths, the rock overlooking the confluence of the Sava and Danube rivers has been identified as one of the place in the story of Jason and the Argonauts. The Paleo-Balkan tribes of Thracians and Dacians ruled this area prior to the Roman conquest, Belgrade was inhabited by a Thraco-Dacian tribe Singi, after the Celtic invasion in 279 BC, the Scordisci took the city, naming it Singidūn. In 34–33 BC the Roman army led by Silanus reached Belgrade, jovian reestablished Christianity as the official religion of the Roman Empire, ending the brief revival of traditional Roman religions under his predecessor Julian the Apostate. In 395 AD, the passed to the Eastern Roman or Byzantine Empire
33.
Reservoir
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A reservoir is a storage space for fluids. These fluids may be water, hydrocarbons or gas, a reservoir usually means an enlarged natural or artificial lake, storage pond or impoundment created using a dam or lock to store water. Reservoirs can be created by controlling a stream that drains a body of water. They can also be constructed in river valleys using a dam, alternately, a reservoir can be built by excavating flat ground or constructing retaining walls and levees. Tank reservoirs store liquids or gases in storage tanks that may be elevated, at grade level, tank reservoirs for water are also called cisterns. Underground reservoirs are used to store liquids, principally either water or petroleum, a dam constructed in a valley relies on the natural topography to provide most of the basin of the reservoir. Dams are typically located at a part of a valley downstream of a natural basin. The valley sides act as walls, with the dam located at the narrowest practical point to provide strength. In many reservoir construction projects, people have to be moved and re-housed, construction of a reservoir in a valley will usually need the river to be diverted during part of the build, often through a temporary tunnel or by-pass channel. In hilly regions, reservoirs are constructed by enlarging existing lakes. Sometimes in such reservoirs the new top water level exceeds the height on one or more of the feeder streams such as at Llyn Clywedog in Mid Wales. In such cases additional side dams are required to contain the reservoir, where water is pumped or siphoned from a river of variable quality or quantity, bank-side reservoirs may be built to store the water. Such reservoirs are usually formed partly by excavation and partly by building a complete encircling bund or embankment, the water stored in such reservoirs may stay there for several months, during which time normal biological processes may substantially reduce many contaminants and almost eliminate any turbidity. The use of reservoirs also allows water abstraction to be stopped for some time. Service reservoirs store fully treated potable water close to the point of distribution, many service reservoirs are constructed as water towers, often as elevated structures on concrete pillars where the landscape is relatively flat. Other service reservoirs can be almost entirely underground, especially in hilly or mountainous country. In the United Kingdom, Thames Water has many underground reservoirs, sometimes called cisterns, built in the 1800s. A good example is the Honor Oak Reservoir in London, constructed between 1901 and 1909, when it was completed it was said to be the largest brick built underground reservoir in the world and it is still one of the largest in Europe
34.
Spawn (biology)
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Spawn is the eggs and sperm released or deposited into water by aquatic animals. As a verb, to refers to the process of releasing the eggs and sperm. Most aquatic animals, except for aquatic mammals and reptiles, reproduce through the process of spawning, spawn consists of the reproductive cells of many aquatic animals, some of which will become fertilized and produce offspring. The process of spawning typically involves females releasing ova into the water, often in large quantities, fungi, such as mushrooms, are also said to spawn a white, fibrous matter that forms the matrix from which they grow. Marine animals, and particularly fish, commonly reproduce by broadcast spawning. This is a method of reproduction where the female releases many unfertilised eggs into the water. At the same time, a male or many males release a lot of sperm into the water which fertilises some of these eggs, the eggs contain a drop of nutrient oil to sustain the embryo as it develops inside the egg case. The oil also provides buoyancy, so the float and drift with the current. The strategy for survival of broadcast spawning is to disperse the fertilised eggs, there the larvae develop as they consume their fat stores, and eventually hatch from the egg capsule into miniature versions of their parents. To survive, they must then become miniature predators themselves, feeding on plankton, fish eventually encounter others of their own kind, where they form aggregations and learn to school. Internally, the sexes of most marine animals can be determined by looking at the gonads, male lampreys, hagfish and salmon discharge their sperm into the body cavity where it is expelled through pores in the abdomen. Male sharks and rays can pass sperm along a duct into a seminal vesicle, externally, many marine animals, even when spawning, show little sexual dimorphism or little difference in colouration. Where species are dimorphic, such as sharks or guppies, the males often have penis-like intromittent organs in the form of a modified fin, a species is semelparous if its individuals spawn only once in their lifetime, and iteroparous if its individuals spawn more than once. The term semelparity comes from the Latin semel, once, and pario, to beget, while iteroparity comes from itero, to repeat, semelparity is sometimes called big bang reproduction, since the single reproductive event of semelparous organisms is usually large and fatal to the spawners. The classic example of an animal is the Pacific salmon, which lives for many years in the ocean before swimming to the freshwater stream of its birth, spawning. Other spawning animals which are semelparous include mayflies, squid, octopus, smelt, capelin, semelparity is often associated with r-strategists. However, most fish and other spawning animals are iteroparous, when the internal ovaries or egg masses of fish and certain marine animals are ripe for spawning they are called roe. Roe from certain species, such as shrimp, scallop, crab, caviar is a name for the processed, salted roe of non-fertilized sturgeon
35.
Sturgeon
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Sturgeon is the common name for the 27 species of fish belonging to the family Acipenseridae. Their evolution dates back to the Triassic some 245 to 208 million years ago, the family is grouped into four genera, Acipenser, Huso, Scaphirhynchus and Pseudoscaphirhynchus. Four species may now be extinct, two closely related species, Polyodon spathula and Psephurus gladius are of the same order, Acipenseriformes, but are in the family Polyodontidae and are not considered to be true sturgeons. Both sturgeons and paddlefish have been referred to as primitive fishes because their morphological characteristics have remained unchanged since the earliest fossil record. Sturgeons are native to subtropical, temperate and sub-Arctic rivers, lakes and coastlines of Eurasia, several species can grow quite large, typically ranging 7–12 feet in length. The largest sturgeon on record was a Beluga female captured in the Volga estuary in 1827, most sturgeons are anadromous bottom-feeders which migrate upstream to spawn but spend most of their lives feeding in river deltas and estuaries. Some species inhabit freshwater environments exclusively while others primarily inhabit marine environments near coastal areas and they are particularly vulnerable to overexploitation and other threats, including pollution and habitat fragmentation. Most species of sturgeon are considered to be at risk of extinction, acipenseriform fishes appeared in the fossil record some 245 to 208 million years ago presumably near the end of the Triassic, making them among the most ancient of actinopterygian fishes. True sturgeons appear in the record during the Upper Cretaceous. In that time, sturgeons have undergone remarkably little change, indicating their evolution has been exceptionally slow. Although their evolution has been slow, they are a highly evolved living fossil. They do however still share several characteristics, such as heterocercal tail, reduced squamation, more fin rays than supporting bony elements. A further confounding factor is the ability of sturgeons to produce reproductively viable hybrids. While ray-finned fishes have an evolutionary history culminating in our most familiar fishes, past adaptive radiations have left only a few survivors, like sturgeons. The wide range of the acipenserids and their endangered status have made collection of systematic materials difficult and these factors have led researchers in the past to identify over 40 additional species that were rejected by later scientists. There is an effort to resolve the taxonomic confusion using a continuing synthesis of systematic data. Sturgeons retain several primitive characters among the bony fishes, along with other members of the subclass Chondrostei, they are unique among bony fishes because the skeleton is almost entirely cartilaginous. Notably, however, the skeleton is not a primitive character
36.
Geomorphology
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Geomorphology is the scientific study of the origin and evolution of topographic and bathymetric features created by physical, chemical or biological processes operating at or near the Earths surface. Geomorphologists work within disciplines such as geography, geology, geodesy, engineering geology, archaeology. This broad base of interests contributes to many styles and interests within the field. Earths surface is modified by a combination of processes that sculpt landscapes, and geologic processes that cause tectonic uplift and subsidence. Many of these factors are strongly mediated by climate, the broad-scale topographies of the Earth illustrate this intersection of surface and subsurface action. Mountain belts are uplifted due to geologic processes, denudation of these high uplifted regions produces sediment that is transported and deposited elsewhere within the landscape or off the coast. On progressively smaller scales, similar ideas apply, where individual landforms evolve in response to the balance of additive processes, often, these processes directly affect each other, ice sheets, water, and sediment are all loads that change topography through flexural isostasy. Topography can modify the climate, for example through orographic precipitation. Many geomorphologists are particularly interested in the potential for feedbacks between climate and tectonics, mediated by geomorphic processes, in addition to these broad-scale questions, geomorphologists address issues that are more specific and/or more local. Fluvial geomorphologists focus on rivers, how they transport sediment, migrate across the landscape, cut into bedrock, respond to environmental and tectonic changes, and interact with humans. Soils geomorphologists investigate soil profiles and chemistry to learn about the history of a landscape and understand how climate, biota. Other geomorphologists study how hillslopes form and change, still others investigate the relationships between ecology and geomorphology. Because geomorphology is defined to comprise everything related to the surface of the Earth and its modification, geomorphologists use a wide range of techniques in their work. These may include fieldwork and field data collection, the interpretation of remotely sensed data, geochemical analyses, geomorphologists may rely on geochronology, using dating methods to measure the rate of changes to the surface. Practical applications of geomorphology include hazard assessment, river control and stream restoration, planetary geomorphology studies landforms on other terrestrial planets such as Mars. Indications of effects of wind, fluvial, glacial, mass wasting, meteor impact, tectonics and this effort not only helps better understand the geologic and atmospheric history of those planets but also extends geomorphological study of the Earth. Planetary geomorphologists often use Earth analogues to aid in their study of surfaces of other planets, other than some notable exceptions in antiquity, geomorphology is a relatively young science, growing along with interest in other aspects of the earth sciences in the mid-19th century. This section provides a brief outline of some of the major figures
37.
Sandstone
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Sandstone is a clastic sedimentary rock composed mainly of sand-sized minerals or rock grains. Most sandstone is composed of quartz or feldspar because these are the most common minerals in the Earths crust, like sand, sandstone may be any color, but the most common colors are tan, brown, yellow, red, grey, pink, white, and black. Since sandstone beds often form highly visible cliffs and other topographic features, quartz-bearing sandstone is converted into quartzite through heating and pressure, usually related to tectonic compression within orogenic belts. They are formed from cemented grains that may either be fragments of a rock or be mono-minerallic crystals. The cements binding these grains together are typically calcite, clays, grain sizes in sands are defined within the range of 0.0625 mm to 2 mm. The formation of sandstone involves two principal stages, first, a layer or layers of sand accumulates as the result of sedimentation, either from water or from air. Typically, sedimentation occurs by the settling out from suspension. The most common cementing materials are silica and calcium carbonate, which are derived either from dissolution or from alteration of the sand after it was buried. Colours will usually be tan or yellow, a predominant additional colourant in the southwestern United States is iron oxide, which imparts reddish tints ranging from pink to dark red, with additional manganese imparting a purplish hue. Red sandstones are seen in the Southwest and West of Britain, as well as central Europe. The regularity of the latter favours use as a source for masonry, either as a building material or as a facing stone. These physical properties allow the grains to survive multiple recycling events. Quartz grains evolve from rock, which are felsic in origin. Feldspathic framework grains are commonly the second most abundant mineral in sandstones, Feldspar can be divided into two smaller subdivisions, alkali feldspars and plagioclase feldspars. The different types of feldspar can be distinguished under a petrographic microscope, below is a description of the different types of feldspar. Alkali feldspar is a group of minerals in which the composition of the mineral can range from KAlSi3O8 to NaAlSi3O8. Plagioclase feldspar is a group of solid solution minerals that range in composition from NaAlSi3O8 to CaAl2Si2O8. Lithic framework grains are pieces of ancient source rock that have yet to weather away to individual mineral grains, accessory minerals are all other mineral grains in a sandstone, commonly these minerals make up just a small percentage of the grains in a sandstone
38.
Neolithic
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It ended when metal tools became widespread. The Neolithic is a progression of behavioral and cultural characteristics and changes, including the use of wild and domestic crops, the beginning of the Neolithic culture is considered to be in the Levant about 10, 200–8800 BC. It developed directly from the Epipaleolithic Natufian culture in the region, whose people pioneered the use of wild cereals, which then evolved into true farming. The Natufian period was between 12,000 and 10,200 BC, and the so-called proto-Neolithic is now included in the Pre-Pottery Neolithic between 10,200 and 8800 BC. By 10, 200–8800 BC, farming communities arose in the Levant and spread to Asia Minor, North Africa, Mesopotamia is the site of the earliest developments of the Neolithic Revolution from around 10,000 BC. Early Neolithic farming was limited to a range of plants, both wild and domesticated, which included einkorn wheat, millet and spelt, and the keeping of dogs, sheep. By about 6900–6400 BC, it included domesticated cattle and pigs, the establishment of permanently or seasonally inhabited settlements, not all of these cultural elements characteristic of the Neolithic appeared everywhere in the same order, the earliest farming societies in the Near East did not use pottery. Early Japanese societies and other East Asian cultures used pottery before developing agriculture, unlike the Paleolithic, when more than one human species existed, only one human species reached the Neolithic. The term Neolithic derives from the Greek νέος néos, new and λίθος líthos, stone, the term was invented by Sir John Lubbock in 1865 as a refinement of the three-age system. In the Middle East, cultures identified as Neolithic began appearing in the 10th millennium BC, early development occurred in the Levant and from there spread eastwards and westwards. Neolithic cultures are attested in southeastern Anatolia and northern Mesopotamia by around 8000 BC. The total excavated area is more than 1,200 square yards, the Neolithic 1 period began roughly 10,000 years ago in the Levant. A temple area in southeastern Turkey at Göbekli Tepe dated around 9500 BC may be regarded as the beginning of the period. This site was developed by nomadic tribes, evidenced by the lack of permanent housing in the vicinity. At least seven stone circles, covering 25 acres, contain limestone pillars carved with animals, insects, Stone tools were used by perhaps as many as hundreds of people to create the pillars, which might have supported roofs. Other early PPNA sites dating to around 9500–9000 BC have been found in Jericho, Israel, Gilgal in the Jordan Valley, the start of Neolithic 1 overlaps the Tahunian and Heavy Neolithic periods to some degree. The major advance of Neolithic 1 was true farming, in the proto-Neolithic Natufian cultures, wild cereals were harvested, and perhaps early seed selection and re-seeding occurred. The grain was ground into flour, emmer wheat was domesticated, and animals were herded and domesticated
39.
Lepenski Vir
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Lepenski Vir is an important Mesolithic archaeological site located in Serbia in central Balkan peninsula. The latest radiocarbon and AMS data suggests that the chronology of Lepenski Vir is compressed between 9500/7200-6000 BC, there is some disagreement about the early start of the settlement and culture of Lepenskir Vir. But the latest data suggest 9500-7200 to be the start, numerous piscine sculptures and peculiar architecture have been found at the site. Lepenski Vir is located on the banks of the Danube in eastern Serbia, within the Iron Gates gorge, the first excavations were made on the site in 1965. In 1966 it was listed as a monument of Yugoslavia. It was only in 1967 that its importance was fully understood after the discovery of the first Mesolithic sculptures, the excavations ended in 1971 when the whole site was relocated 29. 7m higher to avoid flooding from a new artificial lake created in the Iron Gates gorge. The main contribution to the exploration of site was through the work of professor Dragoslav Srejović of the University of Belgrade. 136 buildings, settlements and altars were found in the excavations in 1965-1970. Lepenski Vir was declared a Monument of Culture of Exceptional Importance in 1979, a number of satellite villages belonging to the same culture and time period were discovered in the surrounding area. These additional sites include Hajducka Vodenica, Padina, Vlasac, Ikaona, Kladovska Skela, found artifacts include tools made from stone and bones, the remains of houses, and numerous sacral objects including unique stone sculptures. It is assumed that the people of Lepenski Vir culture represent the descendants of the early European population of the Brno-Předmostí hunter gatherer culture from the end of the last ice age, archeological evidence of human habitation of the surrounding caves dates back to around 20,000 BC. The first settlement on the low plateau dates back to 9500-7200 BC, treskavac - a bare porphyritic cliff which rises on the left bank of the Danube opposite Lepenski Vir like a giant sentinel of the prehistoric settlement. Treskavac was very important to the habitants of Lepenski Vir, the development of the settlement was strongly influenced by the topology of the surrounding area. It sat on a plateau on the banks of the river. As such it offered only limited resources in terms of food, raw materials and this is reflected in the findings from the earliest layer. Proto-Lepenski Vir represents only a settlement of maybe just 4 or 5 families with fewer than a hundred inhabitants. The primary food source of the inhabitants was probably fishing, fishing communities of this type are typical for the wider Danube valley region during this period. In later periods the problems of overpopulation of the settlement became evident
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