Answer:
Trade Routes. Mesopotamia's rivers and location in central Asia supported extensive trade routes. ... This allowed Mesopotamia to access resources not native to its region, like timber and precious metals. In turn, Mesopotamia developed key aspects of civilization, like a token system to keep trading records
Eratosthenes lived in Alexandria of Egypt in BC 240.. He found out the diameter of Earth thorough geometry and mathematics. Hope this helps .. :)
