About F.1 History...20分!!

FOR GENERAL REFERENCE (NOT F.1 HISTORY)
The earliest civilizations that arose in the world developed in the late fourth and the third millennia BC in parts of Asia and north Africa. The three large alluvial systems of the Tigris-Euphrates, the Nile and the Indus supported three great ancient civilizations. Other urban communities also arose during this time. For example, settlement mounds known as tells or tepes, occur in almost all major valleys between Iraq and Pakistan in one direction and between the Caspian Sea and the Indian Ocean in the other and many that have been explored are known to have been occupied in the same period. However, unlike the great civilizations of Egypt, Mesopotamia and Indus, these communities did not form part of a unified economic system, and these small units, though clearly able for a time to support large, wealthy and organized societies, were much weaker than the vast civilizations of the alluvial lowlands.
The Nile Valley has been called the cradle of civilization. The first inhabitants of this area were the Ethiopians, a black skinned people whose descendants entered the valley through Nubia following the Nile River. Thebes and Moroe were among the first cities established and became the religious centers of Upper Egypt. The practice of Ammonism or the worship of the God Ammon was the major religion (Ammon being the God of Gods).