Ch 8 Review Jeopardy
Unconformi
ties
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
Break in geologic time
Answer
Unconformity
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Stratified rock over
unstratified rock
Answer
Nonconformity
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Layer of sedimentary rock
over an older, eroded layer
of rock
Answer
Disconformity
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True or False:
Unconformities determine
absolute age
Answer
false
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Which law tells us that all
rocks beneath an
unconformity are older
than rocks above the
unconformity?
Answer
Law of Superposition
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In radiometric dating, what is
the original material called?
(the radioactive material)
Answer
Parent isotope
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What do we use to date
fossils younger than
70,000 years?
Answer
Carbon-14 dating
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In radiometric dating,
scientists compare the
proportion of a
radioactive parent
isotope to a stable:
___________
Answer
Daughter isotope
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Method of determining
the absolute age of an
object by comparing the
relative percentages of a
radioactive and stable
isotope
Answer
Radiometric dating
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Radioactive decay
happens at a relatively
____________ rate.
Answer
Constant
.
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States that
sedimentary rocks left
undisturbed will
remain in horizontal
layers
Answer
Principle of
horizontality
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Which law tells us that
a fault or igneous
intrusion is always
younger than the rock
layers it cuts through?
Answer
The Law of
Crosscutting
Relationships
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States that undisturbed
sedimentary rock layer is
older than the layer above
it and is younger than the
layers below it
Answer
Law of Superpostion
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Principle that geologic
processes that occurred in
the past can be explained
by current geologic
processes
Answer
Uniformitariansim
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Assuming a fault is
younger than 2 layers its
cutting through is
explained by this law
Answer
Crosscutting
Relationships
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The numeric age of an
object is called: ______
Answer
Absolute age
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These layers are used to
find absolute age and are
often found in glacial
lakes
Answer
Varves
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The age of an object
in relation to ages of
other objects
Answer
Relative Age
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Measuring the rate at
which a stream erodes
its bed estimates what
kind of age?
Answer
Absolute Age
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Arrangement of layer in which coarse
and heavy particles are located in the
bottom layers
Answer
Graded Bedding
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True or False: bacteria can
not survive freezing
temperatures
Answer
True!
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Almost all fossils are
discovered in what kind of
rock?
Answer
Sedimentary
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Fossilized dung or waste
Answer
Coprolite
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Fossilized evidence of past
animal movement such as
tracks and foot prints
Answer
Trace Fossil
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Fossil used to date rock
layers of a particular
geologic age
Answer
Index Fossil
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