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Africa

Back to Africa: A.D. 901 to 1000

Northeast africa

In Ethiopia there was a revival of power under the Cushitic-speaking Zagwe Dynasty. Old documents link King Yimrha-Kristos to the Egyptian Coptic patriarchs Cyril II (1,077-1,092) and Michael (1,092-1102). Meanwhile the Semitic component of the country spread westward from Addis Ababa to include Lake Tana by 1,100. (Ref. 270 ) Nubia, in the region between the 1st and 4th cataracts of the Nile, continued to have two separate kingdoms, one the Kingdom of Nubia and the other, farther south, the Kingdom of Alwa. (Ref. 83 )

Egypt remained an Arab, Moslem state under the Fatimid Dynasty throughout this century. As noted in the last chapter, these Shi'ite rulers had invaded from the west, having first had a base in Tunisia and an army of Berber tribesmen. They developed Cairo as their capital.

North central and northwestern africa

Morocco and Tunisia had a continuing change of emirates and the situation was complicated by the return of hordes of Spanish Moors, who were being run out of Spain. When the Berber Zirid Dynasty tried to become independent of Cairo, the Fatimids sent armies of Bedouin Arabs against them and they succeeded in devastating the region and its economy. At about that same time, on an island just off the Moroccan coast, Ibn Yasin, with some Sahara desert followers, formed a dedicated band and with thousands of camel men, launched a "jihad"

This means a "holy war"
, driving eastward, overrunning all western, north Africa (the Mahgrib), some of Ghana and even part of Spain, establishing the Almoravid Dynasty
In a newer terminology this is called the Murabit Dynasty. (Ref. 137 )
. A concept of Moroccan unity was born and Marakesh was developed as the capital of this new ruling group in 1062.

Subsaharan africa

The acme of the Ghana Empire may have occurred in the first half of this century. The inhabitants were the Negroid Soninke (Sarakole) branch of Mande-speakers. They dominated well over 100,000 square miles of territory with an efficient administration and an army of 200,000, including 40,000 bowmen. Their horses had gold trappings and their guard dogs had gold collars. Al Bakri, writing in 1067, said that the houses were of two stories, with warehouses on the ground floor and living quarters above. The Soninke had their own pagan religion, but they allowed Muslims in their territory. In the second half of the century drought, famine and pillage of the capital city by the Almoravids (1076) started the empire into decline. The invading Moslems were helped by non-Moslem Berbers who needed the salt mines of Ankar. It is probable that the city of Jennejeno, whose development we have followed in previous chapters, participated in this decline as it known that its population decreased, despite new commerce with North Africa. (Ref. 268 ) As Ghana fell, successor states included Diara, Soso, two Mossi states and Manding, or Mali, formed by the Malinke Mande. The ruler of the latter was a Moslem living in the rapidly growing city of Timbuktu. Subject to Mali was an adjacent empire in the middle Niger called Songhoy and at about this same time a people called the "Telem" took over the old abandoned granaries in the caves of the Bandiagara cliff in Mali and used this as a burial place for their dead. (See page 234, volume 1). One cave alone has been found to have 3,000 skeletons. (Ref. 251 )

By this time most of the desert nomads had been converted to Islam, which had spread south from the Maghrib into the states of the Sudan with Muslim merchants as they crossed the Sahara. This dangerous trans-Sahara trade carried luxury goods, eventually fire-arms and salt, a vital element in the diet of tropical countries. On the reverse, north trek went gold, leather work and slaves. (Ref. 8 , 45 , 211 , 83 ) This was the era when the one-humped camel (dromedary) really became of greatest importance in the desert. These hot, dry-country animals could carry 700 to 800 "light pounds". A caravan of 6,000 camels could carry 2,400 to 3,000 tons or the load of 4 to 6 medium sized sailing ships of that period. (Ref. 260 )

Farther east there was the country of Kanem, which had no gold but did a brisk business of exporting slaves. In this century Kanem accepted Islam and under Mai Dunama I, the borders of the state were extended northward across the desert to Fezzan and westward into Hausaland. Dunama is said to have had 30,000 horsemen, cultural and commercial links with the Middle East and to have maintained a rest house in Cairo for pilgrims going from Kanem to Mecca. (Ref. 175 , 83 )

In the dense rain forest of central Africa, Pygmoid and Bushmanoid hunters continued to be present and the Bantu-speaking Negroids had already been migrating down the rivers from the Sudanic belt to that area and were gradually spreading east and south. The Luba people may have been well established in the Lake Kisale region of northern Katanga for three centuries. The Kenya highlands and adjoining northern Tanzania were also already well populated. The original inhabitants, as previously noted, were Caucasoids called "Azanians" and by tradition were tall, bearded and red-skinned. Gradually through the centuries, however, these had been gradually absorbed by the Nilo-Hamites and the Bantu-speaking Negroids. The latter were also filtering into the south into the territory of the Bushmen. Some buildings were erected at Zimbabwe in this century, beginning the development of another great empire which would flower some centuries hence. (Ref. 83 , 175 )

Forward to Africa: A.D. 1101 to 1200

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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