Answer:The river-valley civilizations developed in Sumer, Egypt, China, and the Indus River Valley. These civilizations share some similarities such as their reliance on rivers for agriculture and transportation1. However, there are also differences between these civilizations. For example, the Indus River Valley Civilization was known for its standardized weights and measures, seal carving, and metallurgy with copper, bronze, lead, and tin2. In contrast, the Sumerians were known for their irrigation systems1. The Egyptians were known for their pyramids and mummification practices3. The Chinese were known for their invention of paper and gunpowder3.
To write an effective essay comparing and contrasting these civilizations, you should first identify the similarities and differences between them. Then you should organize your essay by discussing each civilization in turn and comparing it to the others. You should also use specific examples from each civilization to support your arguments4.
Step-by-step explanation: