The rift served as a conduit for movement into southern Africa and also north down the Nile into North Africa and through the continuation of the rift in the Levant to the vast grasslands of Asia.
Starting from about 3 mya a single biome established itself from South Africa through the rift, North Africa, and across Asia to modern China, which has been called "transcontinental 'savannahstan'" recently.
This study examined the formation of a debris dam in steady-state conditions of debris common to flood-prone communities.
The study determined that the hydraulic conditions, in particular flow velocity, influenced the formation of the debris dam.
The Stone Age is a broad prehistoric period during which stone was widely used to make implements with a sharp edge, a point, or a percussion surface.