Sahara
Encyclopedia article; The Columbia Encyclopedia, Sixth Edition, 2009
Collections:
Religious Studies, Education, Psychology, History, Literature, Philosophy, Entire Library
...3,500,000 sq mi (9,065,000 sq km), N...which rises to more than 9,000 ft (2,740 m...which rises to more than 11,000 ft (3,350 m...torrential when it occurs after long dry periods that sometimes...this view explain such changes as being the result of...