For the first week of school in World History, I have learned about four river vally civilizations they are: The Mesopotamia, Egypt, India, and China valley civilizations. The similarities of these four civilizations is that they all have a stable water and food supply, shelter, and domesticated animals used for many different things. Within the civilizations, the similarities are that they have defense and that they have specialized so not everyone is doing the same thing. Also, they all have written languages, even if they aren’t translated yet. Another similarity of these civilizations is that they all believe in polytheism, also known as the belief of more than one god. Some differences is that they have been slightly different time periods, some lasted longer than others. Their architecture is different, Egypt having pyramids and Mesopotamia having Ziggurats, houses made of mud, bricks, and reeds. Another difference is their language and written language. Some civilizations had pictures as their language, while others had actual written language. India had a major difference with the way the city was set up. They had set up their city in a grid like structure, kind of like present day cities, with roads and buildings on the edge of the roads in a manner so they are set in a certain place for a specific reason. Some of the basic characterizations of the civilizations is the specialization of the people, the written language, and the way each civilizations shelter was built.