Question

the river valleys in the plains have been the cardle of civilization

Answer 1

Cradle of civilization
A cradle of civilization is a location where civilization is understood to have emerged. Current thinking is that there was no single "cradle", but several civilizations that developed independently, with the Fertile Crescent (Mesopotamia and Ancient Egypt) understood to be the earliest.Other civilizations arose in Asia among cultures situated along large river valleys, such as the Indo-Gangetic Plain in Ancient India and the Yellow River in Ancient China.The extent to which there was significant influence between the early civilizations of the Near East and those of East Asia is disputed. Scholars accept that the civilizations of Mesoamerica, mainly in modern Mexico, and Norte Chico in Peru emerged independently from those in Eurasia.
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