The following discussion questions:
1.What is the basis and criteria for developing the geologic time scale? Based on your reading and experience, what is the most interesting period within the geologic time scale? Why?
2.What is the nature of scientific inquiry? What is the difference between a scientific hypothesis and a scientific theory? How is hypothesis and theory different from a scientific law?
3.Select one of the common ores in your state or region (such as northwest United States, southeast United States, or western Europe). Where does it come from? Why does it occur there? How important is it economically? Why?