1. 161 Geologic Principles What geologic principles are shown in this diagram?

2. 172 Sequences of Events: What is the order of each event shown?

3. 193 Radiometric Dating U-Pb decay curve How much of the daughter element is remaining after 4 half lives? What is the age of the sample?

4. 204 Potassium-Argon Decay Series

5. 215 Parent and Daughter Nuclides

6. 226 Cross-Cutting Relationships, Superposition and Correlation Determining the age of sedimentary strata by correlation

7. 237 Cross-Cutting Relationships How old (numerical age) is rock unit A? How old (numerical age) is rock unit B? How old (numerical age) is rock unit C?

8. 258 Note the changes in the time scale as it was revised. What do you think are the reasons for this?