Ch 8 Review Jeopardy

1
Ch 8 Review Jeopardy
Unconformities Half Lives Laws Relative/ Absolute Age Fossils
100 100 100 100 100
200 200 200 200 200
300 300 300 300 300
400 400 400 400 400
500 500 500 500 500
2
Break in geologic time
Answer
3
Unconformity
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4
Stratified rock over unstratified rock
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5
Nonconformity
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6
Layer of sedimentary rock over an older, eroded
layer of rock
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7
Disconformity
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8
True or False Unconformities determine absolute
age
Answer
9
false
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10
Which law tells us that all rocks beneath an
unconformity are older than rocks above the
unconformity?
Answer
11
Law of Superposition
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12
In radiometric dating, what is the original
material called? (the radioactive material)
Answer
13
Parent isotope
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14
What do we use to date fossils younger than
70,000 years?
Answer
15
Carbon-14 dating
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16
In radiometric dating, scientists compare the
proportion of a radioactive parent isotope to a
stable ___________
Answer
17
Daughter isotope
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18
Method of determining the absolute age of an
object by comparing the relative percentages of a
radioactive and stable isotope
Answer
19
Radiometric dating
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20
Radioactive decay happens at a relatively
____________ rate.
Answer
21

Constant
.
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22
States that sedimentary rocks left undisturbed
will remain in horizontal layers
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23
Principle of horizontality
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24
Which law tells us that a fault or igneous
intrusion is always younger than the rock layers
it cuts through?
Answer
25
The Law of Crosscutting Relationships
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26
States that undisturbed sedimentary rock layer is
older than the layer above it and is younger than
the layers below it
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27
Law of Superpostion
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28
Principle that geologic processes that occurred
in the past can be explained by current geologic
processes
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29
Uniformitariansim
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30
Assuming a fault is younger than 2 layers its
cutting through is explained by this law
Answer
31
Crosscutting Relationships
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32
The numeric age of an object is called ______
Answer
33
Absolute age
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34
These layers are used to find absolute age and
are often found in glacial lakes
Answer
35
Varves
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36
The age of an object in relation to ages of other
objects
Answer
37
Relative Age
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38
Measuring the rate at which a stream erodes its
bed estimates what kind of age?
Answer
39
Absolute Age
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40
Arrangement of layer in which coarse and heavy
particles are located in the bottom layers
Answer
41
Graded Bedding
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42
True or False bacteria can not survive freezing
temperatures
Answer
43
True!
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44
Almost all fossils are discovered in what kind of
rock?
Answer
45
Sedimentary
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46
Fossilized dung or waste
Answer
47
Coprolite
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48
Fossilized evidence of past animal movement such
as tracks and foot prints
Answer
49
Trace Fossil
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50
Fossil used to date rock layers of a particular
geologic age
Answer
51

• Index Fossil

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