how they used Oracle bones
They were pieces of bone or shell. The bone was typically made of ox scapulae and the shell was typically made of turtle shell.This method was manly used during the Shang dynasty. if the ox bone is used the questions are divination. if the turtle shell was used that meant the question was plastromancy. once bone is scratched they give it to a priest. then the priest would heat it until it cracks then he can read what it says.