Sedimentation and erosion lead to what characteristic of streams?

What is the main idea of the text: hammurabi's code

Drastic boundary changes can occur for all of the following reasons except for a. a shift in the way a river flows b. the collapse of a government system c. a conflict between two neighboring groups d. one country's decision to sell land to another country select the best answer from the choices provide

What happens to rock when acid reacts with it?