1.In the Hadean Eon, was there any life?Was there any water in the oceans?

2.In the Archean Eon, what are two of the key developments that occurred?

3.When there started to be an abundance of Oxygen during the Proterozoic Eon, what other chemical compound was produced that provided a protective layer in the atmosphere?

4.What is radiodating?

5.What does relative dating mean?

6.In the Rock Record, where there are sedimentary rock layers, which layers are newer, the upper layers or bottom layers?

7.Name two disruptive effects or events that interfere with the sedimentary rock layers.

8. What does Absolute Dating mean?

9. Why are the three first Eons called the Precambrian Time?

10. Which came first, the Sun or the Earth?