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 finally retreats from most part of Nigeria, and the West African atmosphere around April to May, leaving an empty atmosphere over Nigeria. The sun's rays enters into the atmosphere of Nigeria more intense than it does during the presence of the Tropical continental airmass, which contained dust (in form of haze) that reduced the intensity of the sun. The overheating of the west Africa land mass and Nigeria in particular creates a low pressure region over west Africa and Nigeria. This low pressure zone attracts the Tropical Maritime Airmass (MT) from the south Atlantic Ocean since areas of low pressures