GEOG 2051 Chapter : 9 Faulting
Document Summary
After about 9000bce, peoples of the eastern sudan domesticated cattle and became nomadic herders but also continued to collect wild grains. After 7500bce, they established permanent settlements and began to cultivate sorghum. Sudanic agriculture became increasingly diverse over the following centuries: sheep and goats arrived, cotton after 6500bce. >after 5000bce, the northern half of africa became much hotter and drier than before. Sahara desert in particular became increasingly arid and uninhabitable. This process of desiccation drove both humans and animals to regions that offered reliable sources of water such as lakes and rivers, such as the valley of the nile river, the principal source of water flowing through north africa. -courses some 4160 miles, from its source at lake victoria to its outlet through the delta to the. Until the completion of the high dam at aswan in 1968, every year the nile flooded the plains downstream.
