Each row is 4 pts.

B. In dating geologic materials, age determinations are often cross-checked by using different isotopes from the same sample. Why is this good science?

2 pts

C. To which geologic Era can you assign the basal granite (uraninite and zircon samples)?

1 pt

D. To which geologic Era can you assign the younger granite intrusion (mica samples)?

1 pt

E. To which geologic Era can you assign the volcanic ash bed?

1 pt

F. Combining the radiometric ages and the relative age principles you know, construct a sequence of events for the block diagram.

2 pts

2 pts

Each row is 4 points. pt each

1 pt each

Final questions:

How are absolute dating and relative dating different?

2 pts

In your opinion, is one method better than the other?

2pts

Imagine that you had to tell someone who didn’t know radioactive material decays into daughter atoms. How could you describe this process to them? Include a description of half-life in your answer.

4pts