1.
Ancient Egypt
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Ancient Egypt was a civilization of ancient Northeastern Africa, concentrated along the lower reaches of the Nile River in what is now the modern country of Egypt. It is one of six civilizations to arise independently, Egyptian civilization followed prehistoric Egypt and coalesced around 3150 BC with the political unification of Upper and Lower Egypt under the first pharaoh Narmer. In the aftermath of Alexander the Greats death, one of his generals, Ptolemy Soter and this Greek Ptolemaic Kingdom ruled Egypt until 30 BC, when, under Cleopatra, it fell to the Roman Empire and became a Roman province. The success of ancient Egyptian civilization came partly from its ability to adapt to the conditions of the Nile River valley for agriculture, the predictable flooding and controlled irrigation of the fertile valley produced surplus crops, which supported a more dense population, and social development and culture. Its art and architecture were widely copied, and its antiquities carried off to far corners of the world and its monumental ruins have inspired the imaginations of travelers and writers for centuries. The Nile has been the lifeline of its region for much of human history, nomadic modern human hunter-gatherers began living in the Nile valley through the end of the Middle Pleistocene some 120,000 years ago. By the late Paleolithic period, the climate of Northern Africa became increasingly hot and dry. In Predynastic and Early Dynastic times, the Egyptian climate was less arid than it is today. Large regions of Egypt were covered in treed savanna and traversed by herds of grazing ungulates, foliage and fauna were far more prolific in all environs and the Nile region supported large populations of waterfowl. Hunting would have been common for Egyptians, and this is also the period when many animals were first domesticated. The largest of these cultures in upper Egypt was the Badari, which probably originated in the Western Desert, it was known for its high quality ceramics, stone tools. The Badari was followed by the Amratian and Gerzeh cultures, which brought a number of technological improvements, as early as the Naqada I Period, predynastic Egyptians imported obsidian from Ethiopia, used to shape blades and other objects from flakes. In Naqada II times, early evidence exists of contact with the Near East, particularly Canaan, establishing a power center at Hierakonpolis, and later at Abydos, Naqada III leaders expanded their control of Egypt northwards along the Nile. They also traded with Nubia to the south, the oases of the desert to the west. Royal Nubian burials at Qustul produced artifacts bearing the oldest-known examples of Egyptian dynastic symbols, such as the crown of Egypt. They also developed a ceramic glaze known as faience, which was used well into the Roman Period to decorate cups, amulets, and figurines. During the last predynastic phase, the Naqada culture began using written symbols that eventually were developed into a system of hieroglyphs for writing the ancient Egyptian language. The Early Dynastic Period was approximately contemporary to the early Sumerian-Akkadian civilisation of Mesopotamia, the third-century BC Egyptian priest Manetho grouped the long line of pharaohs from Menes to his own time into 30 dynasties, a system still used today
2.
Nile
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The Nile is a major north-flowing river in northeastern Africa. It is generally regarded as the longest river in the world, in particular, the Nile is the primary water source of Egypt and Sudan. The Nile has two tributaries, the White Nile and Blue Nile. The White Nile is considered to be the headwaters and primary stream of the Nile itself, the Blue Nile, however, is the source of most of the water and silt. The White Nile is longer and rises in the Great Lakes region of central Africa and it flows north through Tanzania, Lake Victoria, Uganda and South Sudan. The Blue Nile begins at Lake Tana in Ethiopia and flows into Sudan from the southeast, the two rivers meet just north of the Sudanese capital of Khartoum. The northern section of the river flows north almost entirely through the Sudanese desert to Egypt, then ends in a large delta, Egyptian civilization and Sudanese kingdoms have depended on the river since ancient times. Most of the population and cities of Egypt lie along those parts of the Nile valley north of Aswan, in the ancient Egyptian language, the Nile is called Ḥpī or Iteru, meaning river. In Coptic, the words piaro or phiaro meaning the river come from the ancient name. The English name Nile and the Arabic names en-Nîl and an-Nîl both derive from the Latin Nilus and the Ancient Greek Νεῖλος, beyond that, however, the etymology is disputed. One possible etymology derives it from a Semitic Nahal, meaning river, the standard English names White Nile and Blue Nile, to refer to the rivers source, derive from Arabic names formerly applied only to the Sudanese stretches which meet at Khartoum. Above Khartoum, the Nile is also known as the White Nile, at Khartoum the river is joined by the Blue Nile. The White Nile starts in equatorial East Africa, and the Blue Nile begins in Ethiopia, both branches are on the western flanks of the East African Rift. The drainage basin of the Nile covers 3,254,555 square kilometers, the source of the Nile is sometimes considered to be Lake Victoria, but the lake has feeder rivers of considerable size. It is either the Ruvyironza, which emerges in Bururi Province, Burundi, or the Nyabarongo, the two feeder rivers meet near Rusumo Falls on the Rwanda-Tanzania border. Gish Abay is reportedly the place where the water of the first drops of the Blue Nile develop. The Nile leaves Lake Nyanza at Ripon Falls near Jinja, Uganda and it flows north for some 130 kilometers, to Lake Kyoga. For the remaining part it flows westerly through the Murchison Falls until it reaches the very northern shores of Lake Albert where it forms a significant river delta
3.
History of agriculture
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The history of agriculture records the domestication of plants and animals and the development and dissemination of techniques for raising them productively. Agriculture began independently in different parts of the globe, and included a range of taxa. At least eleven separate regions of the Old and New World were involved as independent centers of origin, Wild grains were collected and eaten from at least 20,000 BC. From around 9,500 BC, the eight Neolithic founder crops, emmer and einkorn wheat, hulled barley, peas, lentils, bitter vetch, chick peas and flax were cultivated in the Levant. Rice was domesticated in China between 11,500 and 6,200 BC, followed by mung, soy and azuki beans, pigs were domesticated in Mesopotamia around 13,000 BC, followed by sheep between 11,000 and 9,000 BC. Cattle were domesticated from the aurochs in the areas of modern Turkey. Sugarcane and some vegetables were domesticated in New Guinea around 7,000 BC. Sorghum was domesticated in the Sahel region of Africa by 5,000 BC, in the Andes of South America, the potato was domesticated between 8,000 and 5,000 BC, along with beans, coca, llamas, alpacas, and guinea pigs. Bananas were cultivated and hybridized in the period in Papua New Guinea. In Mesoamerica, wild teosinte was domesticated to maize by 4,000 BC, cotton was domesticated in Peru by 3,600 BC. Camels were domesticated late, perhaps around 3,000 BC, irrigation, crop rotation, and fertilizers were introduced soon after the Neolithic Revolution and developed much further in the past 200 years, starting with the British Agricultural Revolution. The Haber-Bosch process allowed the synthesis of nitrate fertilizer on an industrial scale. Modern agriculture has raised social, political, and environmental issues including pollution, biofuels, genetically modified organisms, tariffs. In response, organic farming developed in the century as a consciously pesticide-free alternative. Scholars have developed a number of hypotheses to explain the origins of agriculture. Current models indicate that wild stands that had been harvested previously started to be planted, localised climate change is the favoured explanation for the origins of agriculture in the Levant. When major climate change took place after the last ice age and these conditions favoured annual plants which die off in the long dry season, leaving a dormant seed or tuber. An abundance of readily storable wild grains and pulses enabled hunter-gatherers in some areas to form the first settled villages at this time, early people began altering communities of flora and fauna for their own benefit through means such as fire-stick farming and forest gardening very early
4.
Flax
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Flax, Linum usitatissimum, is a member of the genus Linum in the family Linaceae. It is a food and fiber crop cultivated in regions of the world. The textiles made from flax are known in the Western countries as linen, and traditionally used for bed sheets, underclothes, the oil is known as linseed oil. In addition to referring to the plant itself, the word flax may refer to the fibers of the flax plant. The plant species is only as a cultivated plant, and appears to have been domesticated just once from the wild species Linum bienne. Several other species in the genus Linum are similar in appearance to L. usitatissimum, cultivated flax, including some that have similar blue flowers, some of these are perennial plants, unlike L. usitatissimum, which is an annual plant. Cultivated flax plants grow to 1.2 m tall, with slender stems, the leaves are glaucous green, slender lanceolate, 20–40 mm long, and 3 mm broad. The flowers are pale blue, 15–25 mm in diameter. The fruit is a round, dry capsule 5–9 mm in diameter, containing several brown seeds shaped like an apple pip. Flax was first domesticated in the Fertile Crescent region, evidence exists of a domesticated oilseed flax with increased seed size by 9,000 years ago from Tell Ramad in Syria. Use of the crop steadily spread, reaching as far as Switzerland, in China and India, domesticated flax was cultivated also by at least 5,000 years ago. Flax was extensively cultivated in ancient Egypt, where the walls had paintings of flowering flax. Egyptian priests only wore linen, as flax was considered a symbol of purity, phoenicians traded Egyptian linen throughout the Mediterranean, and the Romans used it for their sails. Eventually, Flanders became the center of the linen industry in the European Middle Ages. Since then, flax has lost its importance as a commercial crop, Flax is grown for its oil, used as a nutritional supplement, and as an ingredient in many wood-finishing products. Flax is also grown as a plant in gardens. Flax fibers are used to make linen, the Latin species name usitatissimum means most useful. Flax fibers are taken from the stem of the plant, and are two to three times as strong as those of cotton, additionally, flax fibers are naturally smooth and straight
5.
Papyrus
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The word papyrus /pəˈpaɪrəs/ refers to a thick precursor to modern paper made from the pith of the papyrus plant, Cyperus papyrus. Papyrus can also refer to a document written on sheets of papyrus joined together side by side and rolled up into a scroll, the plural for such documents is papyri. Papyrus is first known to have used in ancient Egypt. It was also used throughout the Mediterranean region and in Kingdom of Kush, the Ancient Egyptians used papyrus as a writing material, as well as employing it commonly in the construction of other artifacts such as reed boats, mats, rope, sandals, and baskets. Papyrus was first manufactured in Egypt as far back as the fourth millennium BCE, the earliest archaeological evidence of papyrus was excavated in 2012 and 2013 at Wadi al-Jarf, an ancient Egyptian harbor located on the Red Sea coast. The papyrus rolls describe the last years of building the Great Pyramid of Giza, in the first centuries BCE and CE, papyrus scrolls gained a rival as a writing surface in the form of parchment, which was prepared from animal skins. Sheets of parchment were folded to form quires from which book-form codices were fashioned, early Christian writers soon adopted the codex form, and in the Græco-Roman world, it became common to cut sheets from papyrus rolls to form codices. Codices were an improvement on the scroll, as the papyrus was not pliable enough to fold without cracking. Papyrus had the advantage of being cheap and easy to produce. Unless the papyrus was of quality, the writing surface was irregular. Its last appearance in the Merovingian chancery is with a document of 692, the latest certain dates for the use of papyrus are 1057 for a papal decree, under Pope Victor II, and 1087 for an Arabic document. Its use in Egypt continued until it was replaced by more inexpensive paper introduced by Arabs who originally learned of it from the Chinese, by the 12th century, parchment and paper were in use in the Byzantine Empire, but papyrus was still an option. Papyrus was made in several qualities and prices, pliny the Elder and Isidore of Seville described six variations of papyrus which were sold in the Roman market of the day. These were graded by quality based on how fine, firm, white, grades ranged from the superfine Augustan, which was produced in sheets of 13 digits wide, to the least expensive and most coarse, measuring six digits wide. Materials deemed unusable for writing or less than six digits were considered commercial quality and were pasted edge to edge to be used only for wrapping, until the middle of the 19th century, only some isolated documents written on papyrus were known. They did not contain literary works, the first modern discovery of papyri rolls was made at Herculaneum in 1752. Until then, the papyri known had been a few surviving from medieval times. The English word papyrus derives, via Latin, from Greek πάπυρος, Greek has a second word for it, βύβλος
6.
Drainage divide
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A drainage divide, water divide, divide, ridgeline, watershed, water parting, is the line that separates neighbouring drainage basins. In hilly country, the divide lies along topographical ridges, and may be in the form of a range of hills or mountains. In flat country—especially where the ground is marshy—the divide may be harder to discern, a valley floor divide is a low drainage divide that runs across a valley, sometimes created by deposition or stream capture. Settlements are often built on valley-floor divides in the Alps, examples are Eben im Pongau, Kirchberg in Tirol and Waidring. Extremely low divides with heights of less than two metres are found on the North German Plain within the Urstromtäler, for example, between Havel and Finow in the Eberswalde Urstromtal. In marsh deltas such as the Okavango, the largest drainage area on earth, or in large areas, such as the Finnish Lakeland. Another case is bifurcation, where the watershed is effectively in the river bed, in pre-industrial times, water divides were crossed at portages. Later, canals connected adjoining drainage basins, a key problem in such canals is ensuring a sufficient water supply, category, Drainage basins List of watershed topics European watershed Scottish watershed River source
7.
Geography of Egypt
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Egypt The geography of Egypt relates to two regions, North Africa and Southwest Asia. Egypt has coastlines on both the Mediterranean Sea and the Red Sea, Egypt borders Libya to the west, the Gaza Strip and Israel to the northeast, and Sudan to the south. Egypt has an area of 1,001,449 km2, the longest straight-line distance in Egypt from north to south is 1,024 km, while that from east to west measures 1,240 km. 35,000 km2 -3. 5% - of the land area is cultivated. Most of the lies within the wide band of desert that stretches eastwards from Africas Atlantic Coast across the continent. The Nile valley extends approximately 800 km from Aswan to the outskirts of Cairo, the Nile Valley is very cool and known as Upper Egypt, while the Nile Delta region is known as Lower Egypt. Steep rocky cliffs rise along the banks of the Nile in some stretches, while areas along the Nile are flat. In the past, flooding of the Nile during the summer provided silt, since construction of the Aswan Dam, agriculture in the Nile valley depends on irrigation. The Nile delta consists of flat, low-lying areas, some parts of the delta are marshy and water-logged, and thus not suitable for agriculture. Other areas of the delta are used for agriculture, the Nile Valley and Delta, the most extensive oasis on earth, was created by the worlds longest river and its seemingly inexhaustible sources. Without the topographic channel that permits the Nile to flow across the Sahara, the length within Egypt of the River Nile in its northwards course from three central African sources – the White Nile, the Blue Nile, and the Atbara – totals some 1,600 km. The White Nile, which begins at Lake Victoria in Uganda, in its course from Lake Victoria to Juba in South Sudan, the White Niles channel drops more than 600 m. In its 1, 600-km course from Juba to Khartoum, Sudans capital, in South Sudan, the White Nile passes through the Sudd, a wide, flat plain covered with swamp vegetation and slows almost to the point of stagnation. The Blue Nile, which originates at Lake Tana in Ethiopia and this river has a steeper gradient and therefore flows more swiftly than the White Nile, which it joins at Khartoum. Unlike the White Nile, the Blue Nile carries an amount of sediment. The much shorter Atbarah River, which originates in Ethiopia. During the low-water season, which runs from January to June, but, in late-summer, when torrential rains fall on the Ethiopian Highlands, the Atbarah provides 22% of the Niles flow. The Blue Nile has a similar pattern and it contributes 17% of the Niles waters in the low-water season and 68% during the high-water season
8.
Lake Victoria
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Lake Victoria is one of the African Great Lakes. The lake was named after Queen Victoria by the explorer John Hanning Speke, Speke accomplished this in 1858, while on an expedition with Richard Francis Burton to locate the source of the Nile River. In terms of volume, Lake Victoria is the ninth largest continental lake. Lake Victoria receives its water primarily from rainfall and thousands of small streams. The Kagera River is the largest river flowing into this lake, Lake Victoria is drained solely by the Nile River near Jinja, Uganda, on the lakes northern shore. Lake Victoria occupies a depression in Africa. The lake has a depth of 84 metres and an average depth of 40 metres. Its catchment area covers 184,000 square kilometres, geologically, Lake Victoria is relatively young – about 400,000 years old – and it formed when westward-flowing rivers were dammed by an upthrown crustal block. During its geological history, Lake Victoria went through changes ranging from its present shallow depression, geological cores taken from its bottom show Lake Victoria has dried up completely at least three times since it formed. These drying cycles are probably related to past ice ages, which were times when precipitation declined globally, Lake Victoria last dried out about 17,300 years ago, and it refilled 14,700 years ago. Lake Victoria receives 80 percent of its water from direct rainfall, average evaporation on the lake is between 2.0 and 2.2 metres per year, almost double the precipitation of riparian areas. In the Kenya sector, the main influent rivers are the Sio, Nzoia, Yala, Nyando, Sondu Miriu, Mogusi, combined, these rivers contribute far more water to the lake than does the largest single river entering the lake from the west, the Kagera River. The only outflow from Lake Victoria is the Nile River, which exits the lake near Jinja, in terms of contributed water, this makes Lake Victoria the principal source of the longest branch of the Nile. The uppermost section of the Nile is generally known as the Victoria Nile until it reaches Lake Albert, in 1990–1991, oxygen concentrations in the mixed layer were higher than in 1960–1961, with nearly continuous oxygen supersaturation in surface waters. The changes in oxygenation are considered consistent with measurements of higher algal biomass, the extinction of cichlids in the genus Haplochromis has also been blamed on the lakes eutrophication. The fertility of tropical waters depends on the rate at which nutrients can be brought into solution, the influent rivers of Lake Victoria provide few nutrients to the lake in relation to its size. Because of this, most of Lake Victorias nutrients are thought to be locked up in lake-bottom deposits, by itself, this vegetative matter decays slowly. Animal flesh decays considerably faster, however, so the fertility of the lake is dependent on the rate at which nutrients can be taken up by fish
9.
Blue Nile
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The Blue Nile is a river originating at Lake Tana in Ethiopia. With the White Nile, the river one of the two major tributaries of the Nile. The upper course of the river is called the Abbay in Ethiopia, some Ethiopians have long identified the Blue Nile as the River Gihon mentioned as flowing out of the Garden of Eden, in Genesis 2 and encircling the entire land of Cush. In the local Sudanese language, the word for black is used for the colour blue. The distance of the river from its source to its confluence has been reported as being between 1,460 kilometres and 1,600 kilometres. According to materials published by the Central Statistical Agency, the Blue Nile has a length of 1,450 kilometres. The Blue Nile flows generally south from Lake Tana and then west across Ethiopia, within 30 km of its source at Lake Tana, the river enters a canyon about 400 km long. This gorge is an obstacle for travel and communication from the north half of Ethiopia to the southern half. The power of the Blue Nile may best be appreciated at the Blue Nile Falls and this stream, known as the Lesser Abay River, flows north into Lake Tana. Other affluents of this include, in clockwise order from Gorgora, the Magech River, the Northern Gumara, the Reb River, the southern Gumara River. Lake Tanas outflow then flows some 30 kilometres before plunging over the Blue Nile Falls, the river then loops across northwest Ethiopia through a series of deep valleys and canyons into Sudan, by which point it is only known as the Blue Nile. There are numerous tributaries of the Abay between Lake Tana and the Sudanese border. Those on the side, also in downstream order, include the Handassa, Tul, Abaya, Sade, Tammi, Cha, Shita, Suha, Muga, Gulla, Temcha, Bachat, Katlan, Jiba, Chamoga, Weter. The flow of the Blue Nile reaches maximum volume in the rainy season, the Blue Nile was a major source of the flooding of the Nile that contributed to the fertility of the Nile Valley and the consequent rise of Ancient Egypt and Egyptian mythology. With the completion in 1970 of the Aswan Dam in Egypt, the Blue Nile is vital to the livelihood of Egypt. The Blue Nile, the most significant tributary of the Nile, though shorter than the White Nile, 59% of the water that reaches Egypt originates from the Blue Nile branch of the great river. The river is also an important resource for Sudan, where the Roseires Dam and these dams also help irrigate the Gezira Scheme, which is most famous for its high quality cotton. The region also produces wheat and animal feed crops, in November 2012, Ethiopia began a six-year project for the construction of the Grand Ethiopian Renaissance Dam, a 6000-megawatt hydroelectric dam on the river
