The main items traded were gold and salt. The gold mines of West Africa provided great wealth to West African Empires such as Ghana and Mali. Other items that were commonly traded included ivory, kola nuts, cloth, slaves, metal goods, and beads.
The answer
is C)It used to flood very predictably. It is important in their
agriculture because it provides water for their crops but may also damage
property when the water levels rise too high.
Later on modern irrigation methods have contributed in regulating the
floods from the Nile River.
Creation of law, development of democratic government practices, influences in language, literature, art, infrastructure, and city-planning are all areas where the influences of Roman ideas can be seen.