Dr.Livingston is a doctor or a archaeologists that ether helps people or does research around the world.
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Hess's law allows you to find the net enthalpy of the magnesium combustion by adding the enthalpies of intermediate reactions. The <span>Hess's </span>Law<span> of Constant </span>Heat Summation states that<span> the total enthalpy change for the reaction is the sum of all changes</span> (no matter how many stages the reaction has).
The African slaves have been extremely civilized, with complex politics and expansive and solid economies. in some way, the Europeans noticed this as primitive.
The northern half of Africa had big trade with the human beings of the Mediterranean, which became extraordinarily profitable for each facet. unluckily, the Africans fought constantly for goods to alternate with the Europeans and Arabs, because of this that after the Europeans start to change with them as goods in preference to goods with them, they had been in a country of steady struggle.
African slaves in northern Africa date returned to historical Egypt. the brand new nation (1558–1080 BC) delivered big numbers of slaves as prisoners of struggle up the Nile valley and used them for home and supervised hard work. Ptolemaic Egypt (305 BC–30 BC) used each land and sea route to bring slaves in.
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