The Explanation of the disappearance of the first civilizations.

As I read "The beginning" in my four year old daughters children bible, I wonder exactly how true this version of civilization is. With different myths you see different explanations. I chose to discuss the topic: Historians have devised various explanations for the appearance of the first civilizations on this planet. Which explanation makes the most sense to you? Growing up, I was taught the story of Genesis that's found in The King James version …

…for what it is, a natural disaster. (1)The NIV Rainbow Study Bible, Genesis 1-10, pp.3-13,Rainbow Studies,1996 (2)<Tab/>http://www.wsu.edu/~dee/MESO/GILG.HTM,Mesopotamia, Epic of Gilgamesh (3)<Tab/>Chronology and Catastrophism Workshop, Comets and the Bronze Age Collapse,n1.pp6-10,1992 (4)<Tab/>Science Online, http://www.Science.com The NIV Rainbow Study Bible, Genesis 1-10, pp.3-13,Rainbow Studies,1996