located in West Africa, is the largest hot desert in the world. While deserts are traditionally characterized by a dry climate with low levels of vegetation, the Sahara has been much greener than ...

Over a million years ago, Homo erectus defied the extreme conditions of African ... was dominated by semi-desert plains. Analyses of sediments and fossil pollen show sparse vegetation, mainly ...

Over a million years ago, Homo erectus defied the extreme conditions of African deserts ... the Oldupai region was dominated by semi-desert plains. Analyses of sediments and fossil pollen show sparse ...