<span> large, central granaries, Hindu Kush Mountains, streets planned on a grid</span>
I believe the answer may be 1,3,5 but i could be wrong and please correct me if i am
They broke into 15 separate states
From lakes and grasslands with hippos and giraffes to a vast desert, North Africa's sudden geographical transformation 5,000 years ago was one of the planet's most dramatic climate shifts.
The transformation took place nearly simultaneously across the continent's northern half, a new study finds. The results will appear in an upcoming issue of the journal Earth and Planetary Science Letters.
http://www.livescience.com/28493-when-sahara-desert-formed.html
