text: In this region’s namesake “pump” theory, the precession of the Earth’s axis causes this region to have “wet” and “dry” stages every 41,000 years.
full_question: In this region’s namesake “pump” theory, the precession of the Earth’s axis causes this region to have “wet” and “dry” stages every 41,000 years. Located west of the Hoggar Mountains, the Tanezrouft is the most extreme subdivision of this region with maximum high temperatures of 125 degrees Fahrenheit. Emi Koussi and Bikku Bitti are the two highest points in this region and are located within the Tibesti Mountains. This region is separated from the Sudanian Savanna by the Sahel. Home to sand dunes known as “ergs,” for ten points, name this desert that covers most of North Africa.
first_sentence: In this region’s namesake “pump” theory, the precession of the Earth’s axis causes this region to have “wet” and “dry” stages every 41,000 years.