1.
Lebanon
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Lebanon, officially known as the Lebanese Republic, is a sovereign state in Western Asia. It is bordered by Syria to the north and east and Israel to the south, Lebanons location at the crossroads of the Mediterranean Basin and the Arabian hinterland facilitated its rich history and shaped a cultural identity of religious and ethnic diversity. At just 10,452 km2, it is the smallest recognized country on the entire mainland Asian continent, the earliest evidence of civilization in Lebanon dates back more than seven thousand years, predating recorded history. Lebanon was the home of the Canaanites/Phoenicians and their kingdoms, a culture that flourished for over a thousand years. In 64 BC, the region came under the rule of the Roman Empire, in the Mount Lebanon range a monastic tradition known as the Maronite Church was established. As the Arab Muslims conquered the region, the Maronites held onto their religion, however, a new religious group, the Druze, established themselves in Mount Lebanon as well, generating a religious divide that has lasted for centuries. During the Crusades, the Maronites re-established contact with the Roman Catholic Church, the ties they established with the Latins have influenced the region into the modern era. The region eventually was ruled by the Ottoman Empire from 1516 to 1918, following the collapse of the empire after World War I, the five provinces that constitute modern Lebanon came under the French Mandate of Lebanon. The French expanded the borders of the Mount Lebanon Governorate, which was populated by Maronites and Druze. Lebanon gained independence in 1943, establishing confessionalism, a unique, foreign troops withdrew completely from Lebanon on 31 December 1946. Lebanon has been a member of the Organisation internationale de la francophonie since 1973, despite its small size, the country has developed a well-known culture and has been highly influential in the Arab world. Before the Lebanese Civil War, the experienced a period of relative calm and renowned prosperity, driven by tourism, agriculture, commerce. At the end of the war, there were efforts to revive the economy. In spite of troubles, Lebanon has the highest Human Development Index and GDP per capita in the Arab world. The name of Mount Lebanon originates from the Phoenician root lbn meaning white, occurrences of the name have been found in different Middle Bronze Age texts from the library of Ebla, and three of the twelve tablets of the Epic of Gilgamesh. The name is recorded in Ancient Egyptian as Rmnn, where R stood for Canaanite L, the name occurs nearly 70 times in the Hebrew Bible, as לְבָנוֹן. The borders of contemporary Lebanon are a product of the Treaty of Sèvres of 1920 and its territory was the core of the Bronze Age Phoenician city-states. After the 7th-century Muslim conquest of the Levant, it was part of the Rashidun, Umyayad, Abbasid Seljuk, with the dissolution of the Ottoman Empire, Greater Lebanon fell under French mandate in 1920, and gained independence under president Bechara El Khoury in 1943
2.
Beqaa Valley
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The Beqaa Valley, also transliterated as Bekaa, Biqâ and Becaa and known in Classical antiquity as Coele-Syria, is a fertile valley in eastern Lebanon. It is Lebanons most important farming region, industry also flourishes in Beqaa, especially that related to agriculture. The Beqaa is located about 30 km east of Beirut, the valley is situated between Mount Lebanon to the west and Anti-Lebanon mountains to the east. It forms the northeasternmost extension of the Great Rift Valley, which stretches from Syria to the Red Sea, Beqaa Valley is 120 kilometres long and an average 16 kilometres wide on average. It has a Mediterranean climate of wet, often snowy winters and dry, the region receives limited rainfall, particularly in the north, because Mount Lebanon creates a rain shadow that blocks precipitation coming from the sea. The northern section has an annual rainfall of 230 millimetres ). Two rivers originate in the valley, the Orontes, which flows north into Syria and Turkey, and the Litani, which flows south and then west to the Mediterranean Sea. From the 1st century BC, when the region was part of the Roman Empire, today the valley makes up 40 percent of Lebanons arable land. The northern end of the valley, with its scarce rainfall and less fertile soils, is used primarily as grazing land by pastoral nomads, farther south, more fertile soils support crops of wheat, corn, cotton, and vegetables, with vineyards and orchards centered on Zahlé. The valley also produces hashish and cultivates opium poppies, which are exported as part of the drug trade. Since 1957 the Litani hydroelectricity project—a series of canals and a dam located at Lake Qaraoun in the end of the valley—has improved irrigation to farms in Beqaa Valley. Zahlé is the largest city and the capital of the Beqaa Governorate. It lies just north of the main Beirut–Damascus highway, which bisects the valley, the majority of Zahlés residents are Lebanese Christian, including those who are Melkite Greek Catholic, Maronite Catholic, and Greek Orthodox Christians. The town of Anjar, situated in the part of the valley, has a predominately Armenian Lebanese population and is also famous for its 8th-century Arab ruins. The majority of the inhabitants of the districts of Beqaa, Baalbek and Hermel, are Lebanese Shia, with the exception of the town of Deir el Ahmar. The Baalbeck and Hermel districts have a Christian and Sunni minority, the western and southern districts of the valley also have a mixed population of Muslims, Christians and also Druze. The town of Jib Janine with a population of about 9,000, is situated midway in the valley, Jib Janine is the governmental center of the region known as Western Beqaa, with municipal services like the emergency medical services, a fire department, and a courthouse. Other towns in the Western Beqaa district are Machghara, Sabghine, Kamed al Lawz, Qab Elias and these towns are all a mix of different Lebanese religious confessions
3.
Mozambique
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It is separated from Madagascar by the Mozambique Channel to the east. The capital and largest city is Maputo, between the 1st and 5th centuries AD, Bantu-speaking peoples migrated from farther north and west. Swahili commercial ports existed along the coasts until the arrival of Europeans, the area was explored by Vasco da Gama in 1498 and colonised by Portugal from 1505. The country was an important place where Somali merchants enslaved the local population, after over four centuries of Portuguese rule, Mozambique gained independence in 1975, becoming the Peoples Republic of Mozambique shortly thereafter. After only two years of independence, the country descended into an intense and protracted civil war lasting from 1977 to 1992, in 1994, Mozambique held its first multiparty elections and has remained a relatively stable presidential republic. However, since 2013, following more than 20 years of peace, Mozambique is one of the poorest and most underdeveloped countries in the world. Mozambique is endowed with rich and extensive natural resources, the countrys economy is based largely on agriculture, but industry is growing, mainly food and beverages, chemical manufacturing, and aluminium and petroleum production. The countrys tourism sector is also growing, South Africa is Mozambiques main trading partner and source of foreign direct investment. Belgium, Brazil, Portugal, and Spain are also among the countrys most important economic partners, since 2001, Mozambiques annual average GDP growth has been among the worlds highest. However, the ranks among the lowest in GDP per capita, human development, measures of inequality. The only official language of Mozambique is Portuguese, which is mostly as a second language by about half of the population. Common native languages include Makhuwa, Sena, and Swahili, the countrys population of around 24 million is composed overwhelmingly of Bantu people. The largest religion in Mozambique is Christianity, with significant minorities following Islam, the island-town was the capital of the Portuguese colony until 1898, when it was moved south to Lourenço Marques. Between the 1st and 5th centuries AD, waves of Bantu-speaking people migrated from the west and north through the Zambezi River valley and then gradually into the plateau and they established agricultural communities or societies based on herding cattle. They brought with them the technology for smelting and smithing iron, from the late first millennium AD, vast Indian Ocean trade networks extended as far south into Mozambique as the ancient port town of Chibuene. Connections are evident at sites including Manyikeni for 11–14th century ties with the inland Great Zimbabwe kingdoms, from about 1500, Portuguese trading posts and forts displaced the Arabic commercial and military hegemony, becoming regular ports of call on the new European sea route to the east. The voyage of Vasco da Gama around the Cape of Good Hope in 1498 marked the Portuguese entry into trade, politics, the Portuguese attempted to legitimise and consolidate their trade and settlement positions through the creation of prazos tied to Portuguese settlement and administration. Historically within Mozambique there was slavery, Human beings were bought and sold by African tribal chiefs, Arab Muslim traders and Portuguese and other European traders as well
4.
Rift
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In geology, a rift is a linear zone where the Earths crust and lithosphere are being pulled apart and is an example of extensional tectonics. Typical rift features are a central linear downfaulted depression, called a graben, or more commonly a half-graben with normal faulting, where rifts remain above sea level they form a rift valley, which may be filled by water forming a rift lake. The axis of the area may contain volcanic rocks, and active volcanism is a part of many. Major rifts occur along the axis of most mid-ocean ridges. Failed rifts are the result of rifting that failed to continue to the point of break-up. Typically the transition from rifting to spreading develops at a junction where three converging rifts meet over a hotspot. Two of these evolve to the point of spreading, while the third ultimately fails. Most rifts consist of a series of segments that together form the linear zone characteristic of rifts. The individual rift segments have a dominantly half-graben geometry, controlled by a single basin-bounding fault, segment lengths vary between rifts, depending on the elastic thickness of the lithosphere. Areas of thick colder lithosphere, such as the Baikal Rift have segment lengths in excess of 80 km, while in areas of warmer thin lithosphere, segment lengths may be less than 30 km. Along the axis of the rift the position, and in cases the polarity. Segment boundaries often have a complex structure and generally cross the rift axis at a high angle. These segment boundary zones accommodate the differences in fault displacement between the segments and are known as accommodation zones. Accommodation zones may be located where older crustal structures intersect the rift axis, in the Gulf of Suez rift, the Zaafarana accommodation zone is located where a shear zone in the Arabian-Nubian Shield meets the rift. At the onset of rifting, the part of the lithosphere starts to extend on a series of initially unconnected normal faults. In subaerial rifts, drainage at this stage is generally internal, as the rift evolves, some of the individual fault segments grow, eventually becoming linked together to form the larger bounding faults. Subsequent extension becomes concentrated on these faults, the longer faults and wider fault spacing leads to more continuous areas of fault-related subsidence along the rift axis. Significant uplift of the rift shoulders develops at this stage, strongly influencing drainage, during rifting, as the crust is thinned, the Earths surface subsides and the Moho becomes correspondingly raised
5.
Fault (geology)
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In geology, a fault is a planar fracture or discontinuity in a volume of rock, across which there has been significant displacement as a result of rock-mass movement. Large faults within the Earths crust result from the action of tectonic forces. Energy release associated with movement on active faults is the cause of most earthquakes. A fault plane is the plane that represents the surface of a fault. A fault trace or fault line is the intersection of a plane with the ground surface. A fault trace is also the line commonly plotted on maps to represent a fault. Since faults do not usually consist of a single, clean fracture, the two sides of a non-vertical fault are known as the hanging wall and footwall. By definition, the wall occurs above the fault plane. This terminology comes from mining, when working a tabular ore body, because of friction and the rigidity of rocks, they cannot glide or flow past each other easily, and occasionally all movement stops. A fault in ductile rocks can also release instantaneously when the rate is too great. The energy released by instantaneous strain-release causes earthquakes, a common phenomenon along transform boundaries, slip is defined as the relative movement of geological features present on either side of a fault plane, and is a displacement vector. A faults sense of slip is defined as the motion of the rock on each side of the fault with respect to the other side. In practice, it is only possible to find the slip direction of faults. Based on direction of slip, faults can be categorized as, strike-slip. Dip-slip, offset is predominantly vertical and/or perpendicular to the fault trace, oblique-slip, combining significant strike and dip slip. The fault surface is usually vertical and the footwall moves either left or right or laterally with very little vertical motion. Strike-slip faults with left-lateral motion are known as sinistral faults. Those with right-lateral motion are known as dextral faults
6.
East African Rift
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The East African Rift is an active continental rift zone in East Africa. The EAR began developing around the onset of the Miocene, 22–25 million years ago, in the past, it was considered to be part of a larger Great Rift Valley that extended north to Asia Minor. As extension continues, lithospheric rupture will occur within 10 million years, the Somalian plate will break off, a series of distinct rift basins, the East African Rift System extends over thousands of kilometers. The EAR consists of two main branches, the Eastern Rift Valley includes the Main Ethiopian Rift, running eastward from the Afar Triple Junction, which continues south as the Kenyan Rift Valley. The Western Rift Valley includes the Albertine Rift, and farther south, to the north of the Afar Triple Junction, the rift follows one of two paths, west to the Red Sea Rift or east to the Aden Ridge in the Gulf of Aden. The EAR runs from the Afar Triple Junction in the Afar Triangle of Ethiopia through eastern Africa, the EAR transects through Ethiopia, Kenya, Uganda, Rwanda, Burundi, Zambia, Tanzania, Malawi and Mozambique. The Davie Ridge ranges between 30–120 km wide, with a west facing scarp along the half of its length that rises up to 2300 m above the sea floor. Its movement is concurrent with the EAR, over time, many theories have tried to clarify the evolution of the East African Rift. In 1972 it was proposed that the EAR was not caused by tectonic activity, others proposed an African superplume causing mantle deformation. However, the varying geochemical signatures of a suite of Ethiopian lavas suggest multiple plume sources, at least one of deep mantle origin, additionally, the subject of deep-rooted mantle plumes is still a matter of controversy, and therefore cannot be confirmed. The most recent and accepted view is the theory put forth in 2009, at that time it was suggested that lithospheric thinning generated volcanic activity, further increasing the magmatic processes at play such as intrusions and numerous small plumes. These processes further thin the lithosphere in saturated areas, forcing the thinning lithosphere to behave like a mid-ocean ridge, prior to rifting, enormous continental flood basalts erupted on the surface and uplift of the Ethiopian, Somalian, and East African plateaus occurred. The first stage of rifting of the EAR is characterized by rift localization, periods of extension alternated with times of relative inactivity. There was also the reactivation of a weakness in the crust, a suture zone of multiple cratons, displacement along large boundary faults. The second stage of rifting is characterized by the deactivation of large boundary faults, the development of internal fault segments, today, the narrow rift segments of the East African Rift system form zones of localized strain. These rifts are the result of the actions of numerous faults which are typical of all tectonic rift zones. The African continental crust is generally cool and strong, many cratons are found throughout the EAR, such as the Tanzania and Kaapvaal cratons. The cratons are thick, and have survived for billions of years with little tectonic activity and they are characterized by greenstone belts, tonalites, and other high-grade metamorphic lithologies
7.
Plate tectonics
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The theoretical model builds on the concept of continental drift developed during the first few decades of the 20th century. The geoscientific community accepted plate-tectonic theory after seafloor spreading was validated in the late 1950s, the lithosphere, which is the rigid outermost shell of a planet, is broken up into tectonic plates. The Earths lithosphere is composed of seven or eight major plates, where the plates meet, their relative motion determines the type of boundary, convergent, divergent, or transform. Earthquakes, volcanic activity, mountain-building, and oceanic trench formation occur along plate boundaries. The relative movement of the plates typically ranges from zero to 100 mm annually, tectonic plates are composed of oceanic lithosphere and thicker continental lithosphere, each topped by its own kind of crust. Along convergent boundaries, subduction carries plates into the mantle, the material lost is balanced by the formation of new crust along divergent margins by seafloor spreading. In this way, the surface of the lithosphere remains the same. This prediction of plate tectonics is also referred to as the conveyor belt principle, earlier theories, since disproven, proposed gradual shrinking or gradual expansion of the globe. Tectonic plates are able to move because the Earths lithosphere has greater strength than the underlying asthenosphere. Lateral density variations in the result in convection. Plate movement is thought to be driven by a combination of the motion of the seafloor away from the ridge and drag, with downward suction. Another explanation lies in the different forces generated by forces of the Sun. The relative importance of each of these factors and their relationship to other is unclear. The outer layers of the Earth are divided into the lithosphere and asthenosphere and this is based on differences in mechanical properties and in the method for the transfer of heat. Mechanically, the lithosphere is cooler and more rigid, while the asthenosphere is hotter, in terms of heat transfer, the lithosphere loses heat by conduction, whereas the asthenosphere also transfers heat by convection and has a nearly adiabatic temperature gradient. The key principle of plate tectonics is that the lithosphere exists as separate and distinct tectonic plates, Plate motions range up to a typical 10–40 mm/year, to about 160 mm/year. The driving mechanism behind this movement is described below, tectonic lithosphere plates consist of lithospheric mantle overlain by either or both of two types of crustal material, oceanic crust and continental crust. Average oceanic lithosphere is typically 100 km thick, its thickness is a function of its age, as passes, it conductively cools
8.
Afar Triple Junction
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The Afar Triple Junction is located along a divergent plate boundary dividing the Nubian, Somalian, and Arabian plates. This area is considered an example of continental rifting leading to seafloor spreading and producing an oceanic basin. Here, the Red Sea Rift meets the Aden Ridge and the East African Rift and it extends a total of 6500 km in three arms from the Afar Triangle to Mozambique. The connecting three arms form a triple junction, both of these rifting arms are below sea level and are similar to a mid-ocean ridge. The third rifting arm runs south extending around 4000 km through the countries of Kenya, Uganda, the Democratic Republic of Congo, Rwanda, Burundi, Tanzania, Zambia, Malawi, and finally Mozambique. This southern rifting arm is known as the East African Rift or the East African Rift System. A rift is the result of pulling apart or extension of both the lithosphere and crust and this is a product of what is referred to as mantle upwelling where hotter asthenosphere rises up into colder lithosphere. This rise is associated with thinning and stretching of the lithosphere, rifting is said to have begun in the Late Cretaceous epoch to Paleogene period. At that time the African plate was experiencing far-field stresses caused by portions of the boundary of the African plate subducting under the Eurasian plate. Today, the Arabian plate is experiencing a crustal down pull, or slab pull, at the same time of the subduction in the north there was mantle upwelling causing the crust to down warp and swell into domes. There are many throughout the East African Rift System. The plume is thought to have begun under Lake Tana in Ethiopia, the Kenyan dome has been studied extensively. Gani 2007 proposes that episodic increase of incision of the Ethiopian Plateau suggests episodic growth rates within the plateau and this is proposed since the incision rates have no correlation to the past climate events. Using Archimedes’ principle of isostatic rebound,2.05 km uplift has occurred within the last 30 Ma, the thinned Ethiopian lithosphere could have resulted in ponding from mantle plume and subsequent uplift. Baker, B. H.1972 also suggests that the uplift of this area is sporadic and divided by long periods of stability and erosion. Some periods of uplift are recorded at the end of the Cretaceous that resulted in 400 m uplift, the Ethiopian dome experienced its largest uplift coinciding with the end of the Neogene uplift associated with the Kenyan dome. It has been argued that the current Ethiopian plateau is a result of the most recent uplift of 500 m estimated to be an Oligocene-early Miocene event, but the most accepted argument of the plateau is the result of the Paleogene flood-basalts. The uplift associated with both domes has resulted in structural features due to the swelling and warped crustal extension
9.
Africa
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Africa is the worlds second-largest and second-most-populous continent. At about 30.3 million km² including adjacent islands, it covers 6% of Earths total surface area and 20.4 % of its land area. With 1.2 billion people as of 2016, it accounts for about 16% of the human population. The continent includes Madagascar and various archipelagos and it contains 54 fully recognized sovereign states, nine territories and two de facto independent states with limited or no recognition. Africas population is the youngest amongst all the continents, the age in 2012 was 19.7. Algeria is Africas largest country by area, and Nigeria by population, afarensis, Homo erectus, H. habilis and H. ergaster – with the earliest Homo sapiens found in Ethiopia being dated to circa 200,000 years ago. Africa straddles the equator and encompasses numerous climate areas, it is the continent to stretch from the northern temperate to southern temperate zones. Africa hosts a diversity of ethnicities, cultures and languages. In the late 19th century European countries colonized most of Africa, Africa also varies greatly with regard to environments, economics, historical ties and government systems. However, most present states in Africa originate from a process of decolonization in the 20th century, afri was a Latin name used to refer to the inhabitants of Africa, which in its widest sense referred to all lands south of the Mediterranean. This name seems to have referred to a native Libyan tribe. The name is connected with Hebrew or Phoenician ʿafar dust. The same word may be found in the name of the Banu Ifran from Algeria and Tripolitania, under Roman rule, Carthage became the capital of the province of Africa Proconsularis, which also included the coastal part of modern Libya. The Latin suffix -ica can sometimes be used to denote a land, the later Muslim kingdom of Ifriqiya, modern-day Tunisia, also 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, as Europeans came to understand the real extent of the continent, the idea of Africa expanded with their knowledge. 25,4, whose descendants, he claimed, had invaded Libya, isidore of Seville in 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 double of every person and the opening of the Ka refers to a womb or birthplace
"Great Rift Valley". New International Encyclopedia. 1905.
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