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).
The Sahara Desert, located in North Africa, marks itself as the largest desert in the world by covering more than 3.5 million square miles. Many countries bordering the Sahara experience extreme heat during the summer because of the arid vastness of the Sahara. It can also turn bitterly cold at night. The Sahara Desert is a dry, sandy and arid wasteland. The highest point of the Sahara is Mount Koussi, which is more than 11,000 feet above sea level. At its lowest point, in Egypt, the Sahara is more than 400 feet below sea level.