noun, Pathology. 1. the accumulation of excessive ketones in the body, as in diabetic acidosis. Origin of ketosis. 1915-1920.
Climate zones of Africa, showing the ecological break between the hot desert climate of the Sahara Desert (red), the hot semi-arid climate of the Sahel (orange) and the tropical climate of Central and Western Africa (blue).
History Ancient Africa. The Sahara Desert is the largest hot desert on Earth (the cold desert of Antarctica is larger). The Sahara has played an important role in the development of African culture and history.istory Ancient Africa. The Sahara Desert is the largest hot desert on Earth (the cold desert of Antarctica is larger). The Sahara has played an important role in the development of African culture and history.