The Mediterranean Sea is a sea connected to the Atlantic Ocean, surrounded by the Mediterranean Basin and completely enclosed by land: on the north by Southern Europe and Anatolia, on the south by North Africa and on the east by the Levant. Although the sea is sometimes considered a part of the Atlantic Ocean, it is identified as a separate body of water. Geological evidence indicates that around 5.9 million years ago, the Mediterranean was cut off from the Atlantic and was or desiccated over a period of some 600,000 years, the Messinian salinity crisis, before being refilled by the Zanclean flood about 5.3 million years ago. It covers an approximate area of 2.5 million km2, representing 0.7 % of the global ocean surface, but its connection to the Atlantic via the Strait of Gibraltar-the narrow strait that connects the Atlantic Ocean to the Mediterranean Sea and separates Spain in Europe from Morocco in Africa- is only 14 km wide. In oceanography, it is sometimes called the Eurafrican Mediterranean Sea or the European Mediterranean Sea to distinguish it from mediterranean seas elsewhere.
The Mediterranean Sea has an average depth of 1,500 m and the deepest recorded point is 5,267 m in the Calypso Deep in the Ionian Sea. The sea is bordered on the north by Europe, the east by Asia, in the south by Africa, it is located between latitudes 30° and 46° N and longitudes 6° W and 36° E. Its west-east length, from the Strait of Gibraltar to the Gulf of Iskenderun, on the southwestern coast of Turkey, is 4,000 km; the sea's average north-south length, from Croatia's southern shore to Libya, is 800 km. The sea was an important route for merchants and travellers of ancient times that allowed for trade and cultural exchange between emergent peoples of the region; the history of the Mediterranean region is crucial to understanding the origins and development of many modern societies. The countries surrounding the Mediterranean in clockwise order are Spain, Monaco, Slovenia, Croatia and Herzegovina, Albania, Turkey, Lebanon, Egypt, Tunisia and Morocco. In addition, the Gaza Strip and the British Overseas Territories of Gibraltar and Akrotiri and Dhekelia have coastlines on the sea.
The Ancient Greeks called the Mediterranean ἡ θάλασσα or sometimes ἡ μεγάλη θάλασσα, ἡ ἡμέτερα θάλασσα, or ἡ θάλασσα ἡ καθ'ἡμᾶς. The Romans called it Mare Mare Internum and, starting with the Roman Empire, Mare Nostrum; the term Mare Mediterrāneum appears later: Solinus used it in the 3rd century, but the earliest extant witness to it is in the 6th century, in Isidore of Seville. It means'in the middle of land, inland' in Latin, a compound of medius, -āneus; the Latin word is a calque of Greek μεσόγειος, from μέσος and γήινος, from γῆ. The original meaning may have been'the sea in the middle of the earth', rather than'the sea enclosed by land'; the Carthaginians called it the "Syrian Sea". In ancient Syrian texts, Phoenician epics and in the Hebrew Bible, it was known as the "Great Sea" or as "The Sea". Another name was the "Sea of the Philistines", from the people inhabiting a large portion of its shores near the Israelites. In Modern Hebrew, it is called HaYam HaTikhon'the Middle Sea'. In Modern Arabic, it is known as al-Baḥr al-Mutawassiṭ'the Middle Sea'.
In Islamic and older Arabic literature, it was Baḥr al-Rūm'the Sea of the Romans' or'the Roman Sea'. At first, that name referred to only the Eastern Mediterranean, but it was extended to the whole Mediterranean. Other Arabic names were Baḥr al-šām'the Sea of Syria' and Baḥr al-Maghrib'the Sea of the West'. In Turkish, it is the Akdeniz'the White Sea'; the origin of the name is not clear, as it is not known in earlier Greek, Byzantine or Islamic sources. It may be to contrast with the Black Sea. In Persian, the name was translated as Baḥr-i Safīd, used in Ottoman Turkish, it is the origin of the colloquial Greek phrase Άσπρη Θάλασσα. Johann Knobloch claims that in Classical Antiquity, cultures in the Levant used colours to refer to the cardinal points: black referred to the north, yellow or blue to east, red to south, white to west; this would explain both the Turkish Akdeniz and the Arab nomenclature described above. Several ancient civilizations were located around the Mediterranean shores and were influenced by their proximity to the sea.
It provided routes for trade and war, as well as food for numerous communities throughout the ages. Due to the shared climate and access to the sea, c
Africa is the world's second largest and second most-populous continent, being behind Asia in both categories. At about 30.3 million km2 including adjacent islands, it covers 6% of Earth's total surface area and 20% of its land area. With 1.2 billion people as of 2016, it accounts for about 16% of the world's human population. The continent is surrounded by the Mediterranean Sea to the north, the Isthmus of Suez and the Red Sea to the northeast, the Indian Ocean to the southeast and the Atlantic Ocean to the west; the continent includes various archipelagos. It contains 54 recognised sovereign states, nine territories and two de facto independent states with limited or no recognition; the majority of the continent and its countries are in the Northern Hemisphere, with a substantial portion and number of countries in the Southern Hemisphere. Africa's average population is the youngest amongst all the continents. Algeria is Africa's largest country by area, Nigeria is its largest by population. Africa central Eastern Africa, is accepted as the place of origin of humans and the Hominidae clade, as evidenced by the discovery of the earliest hominids and their ancestors as well as ones that have been dated to around 7 million years ago, including Sahelanthropus tchadensis, Australopithecus africanus, A. afarensis, Homo erectus, H. habilis and H. ergaster—the earliest Homo sapiens, found in Ethiopia, date to circa 200,000 years ago.
Africa encompasses numerous climate areas. Africa hosts a large diversity of ethnicities and languages. In the late 19th century, European countries colonised all of Africa. African nations cooperate through the establishment of the African Union, headquartered in Addis Ababa. Afri was a Latin name used to refer to the inhabitants of then-known northern Africa to the west of the Nile river, in its widest sense referred to all lands south of the Mediterranean; this name seems to have referred to a native Libyan tribe, an ancestor of modern Berbers. The name had been connected with the Phoenician word ʿafar meaning "dust", but a 1981 hypothesis has asserted that it stems from the Berber word ifri meaning "cave", in reference to cave dwellers; the same word may be found in the name of the Banu Ifran from Algeria and Tripolitania, a Berber tribe from Yafran in northwestern Libya. Under Roman rule, Carthage became the capital of the province it named Africa Proconsularis, following its defeat of the Carthaginians in the Third Punic War in 146 BC, which included the coastal part of modern Libya.
The Latin suffix -ica can sometimes be used to denote a land. The Muslim region of Ifriqiya, following its conquest of the Byzantine Empire's Exarchatus Africae preserved a form of the name. According to the Romans, Africa lay to the west of Egypt, while "Asia" was used to refer to Anatolia and lands to the east. A definite line was drawn between the two continents by the geographer Ptolemy, indicating Alexandria along the Prime Meridian and making the isthmus of Suez and the Red Sea the boundary between Asia and Africa; as Europeans came to understand the real extent of the continent, the idea of "Africa" expanded with their knowledge. Other etymological hypotheses have been postulated for the ancient name "Africa": The 1st-century Jewish historian Flavius Josephus asserted that it was named for Epher, grandson of Abraham according to Gen. 25:4, whose descendants, he claimed, had invaded Libya. Isidore of Seville in his 7th-century Etymologiae XIV.5.2. Suggests "Africa comes from the Latin aprica, meaning "sunny".
Massey, in 1881, stated that Africa is derived from the Egyptian af-rui-ka, meaning "to turn toward the opening of the Ka." The Ka is the energetic double of every person and the "opening of the Ka" refers to a womb or birthplace. Africa would be, for the Egyptians, "the birthplace." Michèle Fruyt in 1976 proposed linking the Latin word with africus "south wind", which would be of Umbrian origin and mean "rainy wind". Robert R. Stieglitz of Rutgers University in 1984 proposed: "The name Africa, derived from the Latin *Aphir-ic-a, is cognate to Hebrew Ophir." Ibn Khallikan and some other historians claim that the name of Africa came from a Himyarite king called Afrikin ibn Kais ibn Saifi called "Afrikus son of Abrahah" who subdued Ifriqiya. Africa is considered by most paleoanthropologists to be the oldest inhabited territory on Earth, with the human species originating from the continent. During the mid-20th century, anthropologists discovered many fossils and evidence of human occupation as early as 7 million years ago.
Fossil remains of several species of early apelike humans thought to have evolved into modern man, such as Australopithecus afarensis (radiometrically dated to 3.9–3.0 million years BP, Paranthropus boisei and Homo ergaster have been discovered. After the evolution of Homo sapiens sapiens 150,000 to 100,000 years BP in Africa, the continent was populated by groups of hunter-gatherers; these first modern humans left Africa and populated the rest of the globe during the Out of Africa II migration dated to 50,000 years BP, exiting the continent eith
Irrigation is the application of controlled amounts of water to plants at needed intervals. Irrigation helps to grow agricultural crops, maintain landscapes, revegetate disturbed soils in dry areas and during periods of less than average rainfall. Irrigation has other uses in crop production, including frost protection, suppressing weed growth in grain fields and preventing soil consolidation. In contrast, agriculture that relies only on direct rainfall is referred to as rain-fed or dry land farming. Irrigation systems are used for cooling livestock, dust suppression, disposal of sewage, in mining. Irrigation is studied together with drainage, the removal of surface and sub-surface water from a given area. Irrigation has been a central feature of agriculture for over 5,000 years and is the product of many cultures, it was the basis for economies and societies across the globe, from Asia to the Southwestern United States. Archaeological investigation has found evidence of irrigation in areas lacking sufficient natural rainfall to support crops for rainfed agriculture.
The earliest known use of the technology dates to the 6th millennium BCE in Khuzistan in the south-west of present-day Iran. Irrigation was used as a means of manipulation of water in the alluvial plains of the Indus valley civilization, the application of it is estimated to have begun around 4500 BC and drastically increased the size and prosperity of their agricultural settlements; the Indus Valley Civilization developed sophisticated irrigation and water-storage systems, including artificial reservoirs at Girnar dated to 3000 BCE, an early canal irrigation system from c. 2600 BCE. Large-scale agriculture was practiced, with an extensive network of canals used for the purpose of irrigation. Farmers in the Mesopotamian plain used irrigation from at least the third millennium BCE, they developed perennial irrigation watering crops throughout the growing season by coaxing water through a matrix of small channels formed in the field. Ancient Egyptians practiced basin irrigation using the flooding of the Nile to inundate land plots, surrounded by dykes.
The flood water remained until the fertile sediment had settled before the engineers returned the surplus to the watercourse. There is evidence of the ancient Egyptian pharaoh Amenemhet III in the twelfth dynasty using the natural lake of the Faiyum Oasis as a reservoir to store surpluses of water for use during dry seasons; the lake swelled annually from the flooding of the Nile. The Ancient Nubians developed a form of irrigation by using a waterwheel-like device called a sakia. Irrigation began in Nubia some time between the third and second millennia BCE, it depended upon the flood waters that would flow through the Nile River and other rivers in what is now the Sudan. In sub-Saharan Africa irrigation reached the Niger River region cultures and civilizations by the first or second millennium BCE and was based on wet-season flooding and water harvesting. Evidence of terrace irrigation occurs in pre-Columbian America, early Syria and China. In the Zana Valley of the Andes Mountains in Peru, archaeologists have found remains of three irrigation canals radiocarbon-dated from the 4th millennium BCE, the 3rd millennium BCE and the 9th century CE.
These canals provide the earliest record of irrigation in the New World. Traces of a canal dating from the 5th millennium BCE were found under the 4th-millennium canal. Ancient Persia used irrigation as far back as the 6th millennium BCE to grow barley in areas with insufficient natural rainfall; the Qanats, developed in ancient Persia about 800 BCE, are among the oldest known irrigation methods still in use today. They are now found in the Middle East and North Africa; the system comprises a network of vertical wells and sloping tunnels driven into the sides of cliffs and of steep hills to tap groundwater. The noria, a water wheel with clay pots around the rim powered by the flow of the stream, first came into use at about this time among Roman settlers in North Africa. By 150 BCE the pots were fitted with valves to allow smoother filling as they were forced into the water; the irrigation works of ancient Sri Lanka, the earliest dating from about 300 BCE in the reign of King Pandukabhaya, under continuous development for the next thousand years, were one of the most complex irrigation systems of the ancient world.
In addition to underground canals, the Sinhalese were the first to build artificial reservoirs to store water. These reservoirs and canal systems were used to irrigate paddy fields, which require a lot of water to cultivate. Most of these irrigation systems still exist undamaged up to now, in Anuradhapura and Polonnaruwa, because of the advanced and precise engineering; the system was further extended during the reign of King Parakrama Bahu. The oldest known hydraulic engineers of China were Sunshu Ao of the Spring and Autumn period and Ximen Bao of the Warring States period, both of whom worked on large irrigation projects. In the Sichuan region belonging to the state of Qin of ancient China, the Dujiangyan Irrigation System devised by the Qin Chinese hydrologist and irrigation engineer Li Bing was built in 256 BCE to irrigate a vast area of farmland that today still supplies water. By the 2nd century AD, during the Han Dynasty, the Chinese used chain pumps which lifted water from a lower elevation to a higher one.
These were powered by manual foot-pedal, hydraulic waterwheels, or rotating mechanical wheels pulled by oxen. The water was used for public works, providing water for urban residential quarters and palace gardens, bu
Algeria the People's Democratic Republic of Algeria, is a country in the Maghreb region of North Africa. The capital and most populous city is Algiers, located in the far north of the country on the Mediterranean coast. With an area of 2,381,741 square kilometres, Algeria is the tenth-largest country in the world, the world's largest Arab country, the largest in Africa. Algeria is bordered to the northeast by Tunisia, to the east by Libya, to the west by Morocco, to the southwest by the Western Saharan territory and Mali, to the southeast by Niger, to the north by the Mediterranean Sea; the country is a semi-presidential republic consisting of 1,541 communes. It has the highest human development index of all non-island African countries. Ancient Algeria has known many empires and dynasties, including ancient Numidians, Carthaginians, Vandals, Umayyads, Idrisid, Rustamid, Zirid, Almoravids, Spaniards and the French colonial empire. Berbers are the indigenous inhabitants of Algeria. Algeria is a middle power.
It supplies large amounts of natural gas to Europe, energy exports are the backbone of the economy. According to OPEC Algeria has the 16th largest oil reserves in the world and the second largest in Africa, while it has the 9th largest reserves of natural gas. Sonatrach, the national oil company, is the largest company in Africa. Algeria has one of the largest defence budget on the continent. Algeria is a member of the African Union, the Arab League, OPEC, the United Nations and is a founding member of the Arab Maghreb Union. On 2 April 2019, president Abdelaziz Bouteflika resigned after nearly 20 years in power, following pressure from the country’s army after mass protests against Bouteflika's campaign for a fifth term; the country's name derives from the city of Algiers. The city's name in turn derives from the Arabic al-Jazā'ir, a truncated form of the older Jazā'ir Banī Mazghanna, employed by medieval geographers such as al-Idrisi. In the region of Ain Hanech, early remnants of hominid occupation in North Africa were found.
Neanderthal tool makers produced hand axes in the Levalloisian and Mousterian styles similar to those in the Levant. Algeria was the site of the highest state of development of Middle Paleolithic Flake tool techniques. Tools of this era, starting about 30,000 BC, are called Aterian; the earliest blade industries in North Africa are called Iberomaurusian. This industry appears to have spread throughout the coastal regions of the Maghreb between 15,000 and 10,000 BC. Neolithic civilization developed in the Saharan and Mediterranean Maghreb as early as 11,000 BC or as late as between 6000 and 2000 BC; this life, richly depicted in the Tassili n'Ajjer paintings, predominated in Algeria until the classical period. The mixture of peoples of North Africa coalesced into a distinct native population that came to be called Berbers, who are the indigenous peoples of northern Africa. From their principal center of power at Carthage, the Carthaginians expanded and established small settlements along the North African coast.
These settlements served as market towns as well as anchorages. As Carthaginian power grew, its impact on the indigenous population increased dramatically. Berber civilization was at a stage in which agriculture, manufacturing and political organization supported several states. Trade links between Carthage and the Berbers in the interior grew, but territorial expansion resulted in the enslavement or military recruitment of some Berbers and in the extraction of tribute from others. By the early 4th century BC, Berbers formed the single largest element of the Carthaginian army. In the Revolt of the Mercenaries, Berber soldiers rebelled from 241 to 238 BC after being unpaid following the defeat of Carthage in the First Punic War, they succeeded in obtaining control of much of Carthage's North African territory, they minted coins bearing the name Libyan, used in Greek to describe natives of North Africa. The Carthaginian state declined because of successive defeats by the Romans in the Punic Wars.
In 146 BC the city of Carthage was destroyed. As Carthaginian power waned, the influence of Berber leaders in the hinterland grew. By the 2nd century BC, several large but loosely administered Berber kingdoms had emerged. Two of them were established behind the coastal areas controlled by Carthage. West of Numidia lay Mauretania, which extended across the Moulouya River in modern-day Morocco to the Atlantic Ocean; the high point of Berber civilization, unequaled until the coming of the Almohads and Almoravids more than a millennium was reached during the reign of Masinissa in the 2nd century BC. After Masinissa's death in 148 BC, the Berber kingdoms were reunited several times. Masinissa's line survived until 24 AD, when the remaining Berber territory was annexed to the Roman Empire. For several centuries Algeria was ruled by the Romans. Like the rest of No
Libya the State of Libya, is a country in the Maghreb region in North Africa, bordered by the Mediterranean Sea to the north, Egypt to the east, Sudan to the southeast, Chad to the south, Niger to the southwest, Algeria to the west, Tunisia to the northwest. The sovereign state is made of three historical regions: Tripolitania and Cyrenaica. With an area of 1.8 million square kilometres, Libya is the fourth largest country in Africa, is the 16th largest country in the world. Libya has the 10th-largest proven oil reserves of any country in the world; the largest city and capital, Tripoli, is located in western Libya and contains over one million of Libya's six million people. The second-largest city is Benghazi, located in eastern Libya. Libya has been inhabited by Berbers since the late Bronze Age; the Phoenicians established trading posts in western Libya, ancient Greek colonists established city-states in eastern Libya. Libya was variously ruled by Carthaginians, Persians and Greeks before becoming a part of the Roman Empire.
Libya was an early centre of Christianity. After the fall of the Western Roman Empire, the area of Libya was occupied by the Vandals until the 7th century, when invasions brought Islam to the region. In the 16th century, the Spanish Empire and the Knights of St John occupied Tripoli, until Ottoman rule began in 1551. Libya was involved in the Barbary Wars of the 19th centuries. Ottoman rule continued until the Italian occupation of Libya resulted in the temporary Italian Libya colony from 1911 to 1947. During the Second World War, Libya was an important area of warfare in the North African Campaign; the Italian population went into decline. Libya became independent as a kingdom in 1951. A military coup in 1969 overthrew King Idris I; the "bloodless" coup leader Muammar Gaddafi ruled the country from 1969 and the Libyan Cultural Revolution in 1973 until he was overthrown and killed in the 2011 Libyan Civil War. Two authorities claimed to govern Libya: the Council of Deputies in Tobruk and the 2014 General National Congress in Tripoli, which considered itself the continuation of the General National Congress, elected in 2012.
After UN-led peace talks between the Tobruk and Tripoli governments, a unified interim UN-backed Government of National Accord was established in 2015, the GNC disbanded to support it. Parts of Libya remain outside either government's control, with various Islamist and tribal militias administering some areas; as of July 2017, talks are still ongoing between the GNA and the Tobruk-based authorities to end the strife and unify the divided establishments of the state, including the Libyan National Army and the Central Bank of Libya. Libya is a member of the United Nations, the Non-Aligned Movement, the Arab League, the OIC and OPEC; the country's official religion is Islam, with 96.6% of the Libyan population being Sunni Muslims. The Latin name Libya referred to the region west of the Nile corresponding to its central location in North Africa visited by many Mediterranean cultures which referred to its original inhabitants as the "Libúē." The name Libya was introduced in 1934 for Italian Libya, reviving the historical name for Northwest Africa, from the ancient Greek Λιβύη.
It was intended to supplant terms applied to Ottoman Tripolitania, the coastal region of what is today Libya having been ruled by the Ottoman Empire from 1551 to 1911, as the Eyalet of Tripolitania. The name "Libya" was brought back into use in 1903 by Italian geographer Federico Minutilli. Libya gained independence in 1951 as the United Libyan Kingdom, changing its name to the Kingdom of Libya in 1963. Following a coup d'état led by Muammar Gaddafi in 1969, the name of the state was changed to the Libyan Arab Republic; the official name was "Socialist People's Libyan Arab Jamahiriya" from 1977 to 1986, "Great Socialist People's Libyan Arab Jamahiriya" from 1986 to 2011. The National Transitional Council, established in 2011, referred to the state as "Libya"; the UN formally recognized the country as "Libya" in September 2011, based on a request from the Permanent Mission of Libya citing the Libyan interim Constitutional Declaration of 3 August 2011. In November 2011, the ISO 3166-1 was altered to reflect the new country name "Libya" in English, "Libye" in French.
In December 2017 the Permanent Mission of Libya to the United Nations informed the United Nations that the country's official name was henceforth the "State of Libya". The coastal plain of Libya was inhabited by Neolithic peoples from as early as 8000 BC; the Afroasiatic ancestors of the Berber people are assumed to have spread into the area by the Late Bronze Age. The earliest known name of such a tribe was the Garamantes, based in Germa; the Phoenicians were the first to establish trading posts in Libya. By the 5th century BC, the greatest of the Phoenician colonies, had extended its hegemony across much of North Africa, where a distinctive civilization, known as Punic, came into being. In 630 BC, the ancient Greeks colonized the area around Barca in Eastern Libya and founded the city of Cyrene. Within 200 years, four more important Greek cities were established in the area that became known as
Sudan or the Sudan the Republic of the Sudan, is a country in Northeast Africa. It is bordered by Egypt to the north, the Red Sea to the northeast, Eritrea to the east, Ethiopia to the southeast, South Sudan to the south, the Central African Republic to the southwest, Chad to the west, Libya to the northwest, it has a population of 39 million people and occupies a total area of 1,886,068 square kilometres, making it the third-largest country in Africa. Sudan's predominant religion is Islam, its official languages are Arabic and English; the capital is Khartoum, located at the confluence of the White Nile. Since 2011, Sudan is the scene of ongoing military conflict in its regions South Kordofan and Blue Nile. Sudan's history goes back to the Pharaonic period, witnessing the kingdom of Kerma, the subsequent rule of the Egyptian New Kingdom and the rise of the kingdom of Kush, which would in turn control Egypt itself for nearly a century. After the fall of Kush the Nubians formed the three Christian kingdoms of Nobatia and Alodia, with the latter two lasting until around 1500.
Between the 14th and 15th centuries much of Sudan was settled by Arab nomads. From the 16th–19th centuries and eastern Sudan were dominated by the Funj sultanate, while Darfur ruled the west and the Ottomans the far north; this period saw Arabization. From 1820 to 1874 the entirety of Sudan was conquered by the Muhammad Ali dynasty. Between 1881 and 1885 the harsh Egyptian reign was met with a successful revolt led by the self-proclaimed Mahdi Muhammad Ahmad, resulting in the establishment of the Caliphate of Omdurman; this state was destroyed in 1898 by the British, who would govern Sudan together with Egypt. The 20th century saw the growth of Sudanese nationalism and in 1953 Britain granted Sudan self-government. Independence was proclaimed on January 1, 1956. Since independence, Sudan has been ruled by a series of unstable parliamentary governments and military regimes. Under Gaafar Nimeiry, Sudan instituted Islamic law in 1983; this exacerbated the rift between the Islamic north, the seat of the government and the animists and Christians in the south.
Differences in language and political power erupted in a civil war between government forces influenced by the National Islamic Front and the southern rebels, whose most influential faction was the Sudan People's Liberation Army concluding in the independence of South Sudan in 2011. In April 2019, following contentious protests that faced fierce resistance from the Omar al-Bashir regime, the Sudanese military, under the command of Ahmed Awad Ibn Auf, took control of the nation and established a Transitional Military Council; this move dissolved the constitution. The country's place name Sudan is a name given to a geographical region to the south of the Sahara, stretching from Western Africa to eastern Central Africa; the name derives from the Arabic bilād as-sūdān, or "the lands of the Blacks". The name is one of several toponyms sharing similar etymologies meaning "land of the blacks" or similar meanings, in reference to the dark skin of the inhabitants; the term "Sudanese" had a negative connotation in Sudan due to its association with black African slaves.
The idea of "Sudanese" nationalism goes back to the 1930s and 1940s, when it was popularized by young intellectuals. By the eighth millennium BC, people of a Neolithic culture had settled into a sedentary way of life there in fortified mudbrick villages, where they supplemented hunting and fishing on the Nile with grain gathering and cattle herding. During the fifth millennium BC, migrations from the drying Sahara brought neolithic people into the Nile Valley along with agriculture; the population that resulted from this cultural and genetic mixing developed a social hierarchy over the next centuries which became the Kingdom of Kush at 1700 BC. Anthropological and archaeological research indicate that during the predynastic period Nubia and Nagadan Upper Egypt were ethnically, culturally nearly identical, thus evolved systems of pharaonic kingship by 3300 BC; the Kingdom of Kush was an ancient Nubian state centered on the confluences of the Blue Nile and White Nile, the Atbarah River and the Nile River.
It was established after the Bronze Age collapse and the disintegration of the New Kingdom of Egypt, centered at Napata in its early phase. After King Kashta invaded Egypt in the eighth century BC, the Kushite kings ruled as pharaohs of the Twenty-fifth Dynasty of Egypt for a century before being defeated and driven out by the Assyrians. At the height of their glory, the Kushites conquered an empire that stretched from what is now known as South Kordofan all the way to the Sinai. Pharaoh Piye attempted to expand the empire into the Near East, but was thwarted by the Assyrian king Sargon II; the Kingdom of Kush is mentioned in the Bible as having saved the Israelites from the wrath of the Assyrians, although disease among the besiegers was the main reason for the failure to take the city. The war that took place between Pharaoh Taharqa and the Assyrian king Sennacherib was a decisive event in western history, with the Nubians being defeated in their attempts to gain a foothold in the Near East by Assyria.
Sennacherib's successor Esarhaddon went further, invaded Egypt itself, deposing Taharqa and driving the Nubians from Egypt entirely. Taharqa fled back to his homeland. Egypt became an Assyrian colony.
Petroleum is a occurring, yellowish-black liquid found in geological formations beneath the Earth's surface. It is refined into various types of fuels. Components of petroleum are separated using a technique called fractional distillation, i.e. separation of a liquid mixture into fractions differing in boiling point by means of distillation using a fractionating column. It consists of occurring hydrocarbons of various molecular weights and may contain miscellaneous organic compounds; the name petroleum covers both occurring unprocessed crude oil and petroleum products that are made up of refined crude oil. A fossil fuel, petroleum is formed when large quantities of dead organisms zooplankton and algae, are buried underneath sedimentary rock and subjected to both intense heat and pressure. Petroleum has been recovered by oil drilling. Drilling is carried out after studies of structural geology, sedimentary basin analysis, reservoir characterisation have been completed, it is refined and separated, most by distillation, into a large number of consumer products, from gasoline and kerosene to asphalt and chemical reagents used to make plastics and pharmaceuticals.
Petroleum is used in manufacturing a wide variety of materials, it is estimated that the world consumes about 95 million barrels each day. The use of petroleum as fuel is controversial due to its impact on global warming and ocean acidification. Fossil fuels, including petroleum, need to be phased out by the end of 21st century to avoid "severe and irreversable impacts for people and ecosystems", according to the UN's Intergovernmental Panel on Climate Change; the word petroleum comes from Medieval Latin petroleum, which comes from Latin petra', "rock", Latin oleum, "oil". The term was used in the treatise De Natura Fossilium, published in 1546 by the German mineralogist Georg Bauer known as Georgius Agricola. In the 19th century, the term petroleum was used to refer to mineral oils produced by distillation from mined organic solids such as cannel coal, refined oils produced from them. Petroleum, in one form or another, has been used since ancient times, is now important across society, including in economy and technology.
The rise in importance was due to the invention of the internal combustion engine, the rise in commercial aviation, the importance of petroleum to industrial organic chemistry the synthesis of plastics, solvents and pesticides. More than 4000 years ago, according to Herodotus and Diodorus Siculus, asphalt was used in the construction of the walls and towers of Babylon. Great quantities of it were found on the banks of the river Issus, one of the tributaries of the Euphrates. Ancient Persian tablets indicate the medicinal and lighting uses of petroleum in the upper levels of their society; the use of petroleum in ancient China dates back to more than 2000 years ago. In I Ching, one of the earliest Chinese writings cites that oil in its raw state, without refining, was first discovered and used in China in the first century BCE. In addition, the Chinese were the first to use petroleum as fuel as early as the fourth century BCE. By 347 AD, oil was produced from bamboo-drilled wells in China. Crude oil was distilled by Arabic chemists, with clear descriptions given in Arabic handbooks such as those of Muhammad ibn Zakarīya Rāzi.
The streets of Baghdad were paved with tar, derived from petroleum that became accessible from natural fields in the region. In the 9th century, oil fields were exploited in the area around Azerbaijan; these fields were described by the Arab geographer Abu al-Hasan'Alī al-Mas'ūdī in the 10th century, by Marco Polo in the 13th century, who described the output of those wells as hundreds of shiploads. Arab and Persian chemists distilled crude oil in order to produce flammable products for military purposes. Through Islamic Spain, distillation became available in Western Europe by the 12th century, it has been present in Romania since the 13th century, being recorded as păcură. Early British explorers to Myanmar documented a flourishing oil extraction industry based in Yenangyaung that, in 1795, had hundreds of hand-dug wells under production. Pechelbronn is said to be the first European site where petroleum has been used; the still active Erdpechquelle, a spring where petroleum appears mixed with water has been used since 1498, notably for medical purposes.
Oil sands have been mined since the 18th century. In Wietze in lower Saxony, natural asphalt/bitumen has been explored since the 18th century. Both in Pechelbronn as in the coal industry dominated the petroleum technologies. Chemist James Young noticed a natural petroleum seepage in the Riddings colliery at Alfreton, Derbyshire from which he distilled a light thin oil suitable for use as lamp oil, at the same time obtaining a more viscous oil suitable for lubricating machinery. In 1848, Young set up a small business refining the crude oil. Young succeeded, by distilling cannel coal at a low heat, in creating a fluid resembling petroleum, which when treated in the same way as the seep oil gave similar products. Young found that by sl