1. Earth’s History Review!

2. Geologic Time Scale and Fossils
Relative Dating
Absolute Dating
Geologic Time Scale and Fossils
Misc.
100
100
100
100
200
200
200
200
300
300
300
300
400
400
400
400
500
500
500
500

3. Relative dating provides
What is the sequence or order of events in which the rocks were laid down?
Relative dating provides
Us with…
Row 1, Col 1

4. And the Lindow man’s ages Were found using ______ dating.
What is C-14 or Absolute?
Otzi the Ice man
And the Lindow man’s ages
Were found using ______ dating.
1,2

5. Longest division of geologic
What is an era?
Longest division of geologic
time
1,3

6. Find fossils in rocks cooled from
What is the fossils would melt and be destroyed?
Why would we not
Find fossils in rocks cooled from
Magma?
1,4

7. An igneous intrusion cuts
What is cross cutting?
An igneous intrusion cuts
Through other rock
layers
2,1

8. The element that the original
What is the daughter product?
The element that the original
Radioactive element
Decays into.
2,2

9. History is within this time
What is Pre-Cambrian?
About 88% of Earth’s
History is within this time
Period.
2,3

10. Sample A has gone through 3 half-lives. The half-life of the
What is 1500 years old?
Sample A has gone through
3 half-lives. The half-life of the
Element is 500 years. How
Old is sample A?
2,4

11. incomplete. Can be caused by
What is unconformity?
When rock layers are
incomplete. Can be caused by
Erosion.
3,1

12. The original radioactive element Before it begins to decay.
What is the parent material?
The original radioactive element
Before it begins to decay.
3,2

13. Molds, Casts, Petrification
What are different methods of fossil preservation?
Molds, Casts, Petrification
And Carbonization
3,3

14. To match up rock layers by
What is to correlate?
To match up rock layers by
Looking at clues.
3,4

15. Remains or traces of once Lived for a certain known
What is fossils and index fossils?
Remains or traces of once
Living organisms
Lived for a certain known
Time period and can
Be used to date things.
4,1

16. The time it takes for 50% Of the radioactive Isotope to decay. 4,2
What is half-life?
The time it takes for 50%
Of the radioactive
Isotope to decay.
4,2

17. To represent recent geologic history
What is …?
Where would we break up
The time line below
To represent recent geologic history
And geologic past?
Today bya
4,3

18. Difference between absolute and
What is R= sequence or order of events, A= Age in years of a sample?
Difference between absolute and
Relative dating.
4,4

19. Which is the oldest rock layer? Which is the youngest?
What is I, R and the principle of superposition?
Which is the oldest rock layer?
Which is the youngest?
What principle tells us this?
5,1

20. How many half-lives has an Element undergone if there is
What is two half-lives?
How many half-lives has an
Element undergone if there is
25 grams of parent
Material and 75grams of
Daughter?
5,2

21. Why do we know more about Recent geologic history
What is fossil record, preservation and destroying of clues and evidence?
Why do we know more about
Recent geologic history
Than events occurring in geologic
Past?
5,3

22. Fill in the table if we start
Parent Material (50, 25), Daughter Product (50, 75)
Fill in the table if we start
With 100g of the sample.
Hal-life
Parent Material
Daughter Product 1 2
5,4