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Africa

Back to Africa: 600 to 501 B.C.

Northeast africa

Perhaps as early as this century the art of iron smelting was imported into Sudan from Egypt via Kush, which had become an immensely rich country. The early inhabitants of Axum on the Ethiopian plateau south of Kush were probably of mixed Asian and Negro origin, and they were joined about 500 B.C. by settlers from southern Arabia, some of whom were apparently Jews. An Ethiopian-Jewish community, as well as a later Christian one, has existed in Ethiopia

The word "Ethiopia" is Greek for "burnt-face". Actually this region was usually called "Abyssinia" until 1923. (Ref. 83 , 240 )
up to the present time. From those contacts arose the legend that the Queen of Sheba bore a son by Solomon, who became emperor of Ethiopia and founded the Solomaic Dynasty. (The Queen of Sheba, of course, lived in the 10th century B.C.)

Egypt continued to be ruled by the Persians, with no advance in their own civilization except that their economic isolation was eliminated and they did complete the Nile-Red Sea canal which had been begun by Necho. Apparently the original Egyptian cotton was a poor product and linen from flax dominated Egyptian clothing. (Ref. 213 ) The Egyptian science of previous centuries began to be picked up by Greeks who had colonies at Naucrates on the Nile delta, with others along the coast towards Libya. All of this was further developed in the subsequent Hellenic Culture. (Ref. 136 , 28 , 175 , 83 )

North central and northwest africa

In addition to the Greek settlements along the Libyan coast there were Phoenician colonies all along the western half of the North African shore from Leptis (east of Carthage) to the Pillars of Hercules. Carthage was rapidly developing an empire of its own, controlling the old Tartessus area of Spain by 480 B.C. and later gaining all of the western half of the African Mediterranean shore line. It was mentioned in the last chapter that at the end of that century Hanno, of Carthage, had established a large colony down the Atlantic coast of Africa. Other writers have dated this colony, some 2,600 miles down the Atlantic, at 490 B.C., but in any event, archeologists have shown that Hanno was not the first, as there were already ruins of a large megalithic city of Lixus, far south of Gibralter, just where the ocean current sweeps past to go directly to the Gulf of Mexico. The Romans later called this ancient city the "Eternal City" or by a still older name, "Sun City", as it was apparently built by sun-worshippers who included astronomers, architects, masons, scribes and expert potters. The Sumerians, Assyrians, Hittites, Phoenicians, Egyptians and the Lixus people were all fanatic sun-worshippers, just as were the Olmecs and the Mochica in Mexico and Peru, respectively. The Carthaginian Himilco also continued his trips up to the northern shores of Europe to obtain tin for bronze . In his effort to find the ultimate source of that metal, and avoid the Celtic middle men of France, Himilco finally found the channel islands and then the coast of Britain, either at Cornwall or Devon, eventually to discover the tin mines of Cornwall. (Ref. 28 , 136 , 95 , 66 ) The Carthaginian position in the Mediterranean was weakened in 480 B.C. when a large Carthaginian force suffered an humiliating defeat at the hands of Greek Syracusans in northern Sicily. Carthage then seemed to also lose its former Etruscan ally, the city-state of Caere. Perhaps this occurred because Caere had tried to establish a colony on the Atlantic island of Madeira as a means of interrupting the Carthaginian merchant marine's monopoly of the tin supply from Gaul and Cornwall. (Ref. 75 )

In addition to the civilized centers of Egypt, Kush and Carthage, the 4th century center of Cyrene, in present day east Libya, must be mentioned. This was a Greek city, settled in the previous- century but which now dominated an entire community area which was prosperous and cultured. (Ref. 83 )

Subsaharan africa

The climate continued to deteriorate in the Sahara and life in the Akan jeir Culture of the Tichit Valley of southern Mauretania was becoming progressively more difficult. In this century the areas of Ghana and Kanem began development, probably with the help of Berbers from the north, and with the economic foundation of the export of gold and slaves. Excavations south of Lake Chad give evidence of people, stone and bone implements and cattle-raising at the beginning of this century. (Ref. 83 ) In Nigeria an iron industry developed on the Jos Plateau, and sculptured heads and figurines in terracotta dating to 500 B.C. have been found near Nok, in that country. About the same time, the Negroes, starting northwest of the rain forests, migrated down through the forest along the great rivers to the central part of the southern savannas and then spread out in all directions to the eastern part of the continent and toward the south. They spoke the Bantu language, which is the ancestor of most African languages today. These men took knowledge of mining and iron with them. (Ref. 45 , 8 , 175 ) Hottentots and Bushmen still lived in the far south.

Forward to Africa: 400 to 301 B.C.

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Questions & Answers

Three charges q_{1}=+3\mu C, q_{2}=+6\mu C and q_{3}=+8\mu C are located at (2,0)m (0,0)m and (0,3) coordinates respectively. Find the magnitude and direction acted upon q_{2} by the two other charges.Draw the correct graphical illustration of the problem above showing the direction of all forces.
Kate Reply
To solve this problem, we need to first find the net force acting on charge q_{2}. The magnitude of the force exerted by q_{1} on q_{2} is given by F=\frac{kq_{1}q_{2}}{r^{2}} where k is the Coulomb constant, q_{1} and q_{2} are the charges of the particles, and r is the distance between them.
Muhammed
What is the direction and net electric force on q_{1}= 5µC located at (0,4)r due to charges q_{2}=7mu located at (0,0)m and q_{3}=3\mu C located at (4,0)m?
Kate Reply
what is the change in momentum of a body?
Eunice Reply
what is a capacitor?
Raymond Reply
Capacitor is a separation of opposite charges using an insulator of very small dimension between them. Capacitor is used for allowing an AC (alternating current) to pass while a DC (direct current) is blocked.
Gautam
A motor travelling at 72km/m on sighting a stop sign applying the breaks such that under constant deaccelerate in the meters of 50 metres what is the magnitude of the accelerate
Maria Reply
please solve
Sharon
8m/s²
Aishat
What is Thermodynamics
Muordit
velocity can be 72 km/h in question. 72 km/h=20 m/s, v^2=2.a.x , 20^2=2.a.50, a=4 m/s^2.
Mehmet
A boat travels due east at a speed of 40meter per seconds across a river flowing due south at 30meter per seconds. what is the resultant speed of the boat
Saheed Reply
50 m/s due south east
Someone
which has a higher temperature, 1cup of boiling water or 1teapot of boiling water which can transfer more heat 1cup of boiling water or 1 teapot of boiling water explain your . answer
Ramon Reply
I believe temperature being an intensive property does not change for any amount of boiling water whereas heat being an extensive property changes with amount/size of the system.
Someone
Scratch that
Someone
temperature for any amount of water to boil at ntp is 100⁰C (it is a state function and and intensive property) and it depends both will give same amount of heat because the surface available for heat transfer is greater in case of the kettle as well as the heat stored in it but if you talk.....
Someone
about the amount of heat stored in the system then in that case since the mass of water in the kettle is greater so more energy is required to raise the temperature b/c more molecules of water are present in the kettle
Someone
definitely of physics
Haryormhidey Reply
how many start and codon
Esrael Reply
what is field
Felix Reply
physics, biology and chemistry this is my Field
ALIYU
field is a region of space under the influence of some physical properties
Collete
what is ogarnic chemistry
WISDOM Reply
determine the slope giving that 3y+ 2x-14=0
WISDOM
Another formula for Acceleration
Belty Reply
a=v/t. a=f/m a
IHUMA
innocent
Adah
pratica A on solution of hydro chloric acid,B is a solution containing 0.5000 mole ofsodium chlorid per dm³,put A in the burret and titrate 20.00 or 25.00cm³ portion of B using melting orange as the indicator. record the deside of your burret tabulate the burret reading and calculate the average volume of acid used?
Nassze Reply
how do lnternal energy measures
Esrael
Two bodies attract each other electrically. Do they both have to be charged? Answer the same question if the bodies repel one another.
JALLAH Reply
No. According to Isac Newtons law. this two bodies maybe you and the wall beside you. Attracting depends on the mass och each body and distance between them.
Dlovan
Are you really asking if two bodies have to be charged to be influenced by Coulombs Law?
Robert
like charges repel while unlike charges atttact
Raymond
What is specific heat capacity
Destiny Reply
Specific heat capacity is a measure of the amount of energy required to raise the temperature of a substance by one degree Celsius (or Kelvin). It is measured in Joules per kilogram per degree Celsius (J/kg°C).
AI-Robot
specific heat capacity is the amount of energy needed to raise the temperature of a substance by one degree Celsius or kelvin
ROKEEB
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Source:  OpenStax, A comprehensive outline of world history. OpenStax CNX. Nov 30, 2009 Download for free at http://cnx.org/content/col10595/1.3
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