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 airmass (CT) in turn, causes the wind to expand and become lighter as this is the normal behaviour for winds moving above intensely heated grounds. The Tropical continental airmass (CT) loses its strength as a major airmass in the region of west Africa and over Nigeria at this time (around February in the southern part of Nigeria to June in northern Nigeria) and begins to retreat coupled with the rising of air in form of convection within this airmass (Tropical continental airmass (CT)), further weakening the dominance of the wind over west Africa and Nigeria. The Tropical continental airmass (CT)