Sub-Saharan Africa SOL REVIEW Tools A B low per capital GDP low life expectancy high population growth large percent of population under 15 low literacy rates uneven distribution of wealth many ethnic groups-languages and customs large number of refugess knowledge of history through oral tradition many landlocked states subsistence agriculture namadic herding slash and burn agriculture productivity lags behind population growth historical empires Mali, Ghana and Zimbabwe location of equator few harbors limited fertility of rainforest soils