Gleaning is the act of collecting leftover crops from farmers' fields after they have been commercially harvested or on fields where it is not economically profitable to harvest, is a practice described in the Hebrew Bible that became a legally enforced entitlement of the poor in a number of Christian kingdoms.
Much of the region is an ancient highland, but there is basaltic bedrock near Cooma and Nimmitabel that produce the only true chernozems in the whole continent, which are some of the best soils in Australia.
The Sahel is also a cultural transition zone separating the Arab and Muslim dominated countries of North Africa from the African and Christian (and/or animist) peoples of sub-Saharan Africa.Note how the presence of Islam tails off dramatically as one leaves the Sahel and enters sub-Saharan Africa.he East African Rift Valley System is an example of a fissure in the Earthâs crust in which the continent is splitting apart, causing an extensive series of valleys, fingerlike freshwater lakes and volcanoes to form. The map below shows how dominant savanna zones are in sub-Saharan Africa, in particular the Sahel.