History of West Africa more states. Early human settlers arrived in West Africa around 12,000 BCE. In the fifth millennium, as the ancestors of modern West Africans began entering the area, the development of sedentary farming began to take place in West Africa. The Iron industry, in both smelting and forging for tools and weapons, appeared in Sub-Saharan Africa by 1200 BCE, and by 400 BCE, contact had been made with the Mediterranean civilizations, and a regular trade included exporting gold, cotton, metal, and leather in exchange for copper, horses, salt, textiles, and beads. Culture developed further with the Nok culture (1000 BCE to
Geography of Nigeria of low pressure to develop over west Africa and Nigeria (between March to May). The Tropical continental airmass (CT) from the Sahara Desert in the northern part of West Africa, is weakened due to the overheating of the land surface in west Africa and Nigeria at this time. The Tropical continental airmass (CT) begins to retreat northwards to the Sahara Desert due to massive heating of the land which transfers heat in the form of convection into the Tropical continental airmass (CT) which constitutes the main layer of air above the land. This transfer of heat in the Tropical continental