I need help with the 4 early river valley civilizations , Mesopotamian, Nile, Yellow River, and the Indus River. I need to locate date and describe them, but I'm having trouble because every website says something different. I don't understand what what it means by describe, like what does it look like or describe how they were form.. I don't really know what it means so if you could I would really appreciate it if anyone could help me out. I would just like quick brief answers that aren't from Wikipedia. Any quick help would work, and no i'm not being lazy I just really don't understand it. So any help would be greatly accepted and thnx.. 