They noticed circumference/diameter was a constant ratio applicable to all circles no matter whattheir sizes were
the early civilizations began in Africa but most exact in Zambia
The economy of early civilizations was based around agriculture.
The Nile River was the axis of two early African civilizations
Inca
?
the early civilization in mexico is olmec
Food
Vast Empires
Early civilizations emerged between the Tigris, Euphrates, Nile, and (sorry, blanking out out on the fourth...) Rivers.
Obviously not or we would not be referring to them as "early" civilisations.
Answer this question… What innovation made early civilizations historic rather than prehistoric?
king