1. Define Absolute Time and Relative Time.

2. Discuss similarities and differences between absolute and relative time.

3. Describe various units of geologic time such as eons, eras, periods, and epochs.

4. Using a timeline, place the eras and periods in order from left to right, oldest to the most recent.

5. What is the fossil record and what problems are associated with it?

6. How do fossils help us understand changes in life forms and climate on Earth?

5. List the logical order of the Earth's development during the Precambrian Era.

6. List and explain two reasons why eras and periods end and others begin.

7. List three evolutionary developments in life that define the Precambrian/Paleozoic Boundary.

8. List the periods of the Paleozoic Era.

9. Briefly describe each period and why they differ.

10.Describe when and where the catastrophic event occurred that ended the Paleozoic Ear and began the Mesozoic Era.

11. What where three periods of the Mesozoic Era and how did they differ from each other?

12. List the five top reasons why dinosaurs disappeared.

13. What caused the Mesozoic/Cenozoic time boundary change?

14. Name the two periods of the Cenozoic Era and describe each.