Which statement about the desert regions of North Africa is true?

A. The Sahara averages 14 inches of rain a year.

B. All desert regions of North Africa have a semi-arid climate.

C. No vegetation grows in the desert regions of North Africa.

D. Droughts have expanded the Sahara.
The unique black and pink landforms of the Ahaggar were formed by

A. glaciers.

C. running water.

B. volcanoes.

D. earthquakes.