PRESENTED
BY
8th Grade Science
Geologic
Vocab.
Geologic
Time
Relative
Dating
Absolute
Dating
100
100
100
100
200
200
200
200
300
300
300
300
400
400
400
400
500
500
500
500
F
I
N
A
L
J
E
O
P
A
R
D
Y!
1: $100
This is caused by an earthquake
Fault
1,1
2: $100
Approx. how old is the earth?
4.6 Billion Years Old
1,2
3: $100
Which layer is older
Blue - Limestone
1,3
4: $100
What helps us to do absolute
dating of rocks?
Radioactive decay
1,4
1: $200
This states that older layers are
below younger layers
The Law of Superposition
2,1
2: $200
What determines when one Era
ends and another begins (a new
named Era starts)?
Major biologic event occurs like
extinction or acceleration of new
species.
2,2
3: $200
What is H and how does it compare in
age to R
Extrusion/Intrusion; H is older than R
(explain reasoning) or H is younger
than R (explain reasoning)
2,3
4: $200
What is a Half-Life?
The number of years it takes for ½ of the
radioactive element to decay
2,4
1: $300
This type of dating compares
things as older or younger
Relative Dating
3,1
2: $300
What had to happen on Earth
before complex (multi-celled)
organism could develop.
Oxygen produced by cyanobacteria and
volcanoes moving onto land where
they burned differently.
3,2
3: $300
Which is older B or I?
I is older
3,3
4: $300
What is the half-life in years of the
element below?
28.1 years
3,4
1: $400
This can be found only in limited
layers and helps to date objects
Index Fossil
4,1
2: $400
What Eon do we live in?
Phanerozoic
4,2
3: $400
List 3 things that can impact
geologists being able to accurately
date an area?
Intrusions, Extrusions, Faults, Erosion
4,3
4: $400
How long would it take for 2 half-lives ?
28 billion years
4,4
1: $500
This is what we call a break in an old
layer that then comes in contact with a
new layer
Unconformity
5,1
2: $500
In which ERA did dinosaurs live?
Mesozoic
5,2
3: $500
Which layer(s) are younger than A – explain
5,3
4: $500
Would an element with a half-life
of 100 years be useful in dating a
dinosaur fossil? Explain
No, dinosaurs are millions of years
old and there would not be enough
Radioactive material left to use.
5,4
FINAL JEOPARDY!
Topic:
Absolute Dating
Why is radiometric dating not a useful tool
for a Sedimentary Rock layer. Be sure
To explain your answer fully.