Transcript Ch 8 Rock Record Jeopardy

Ch 8 Review Jeopardy
Unconformi
ties
Half
Lives
Laws
Relative/
Absolute
Age
Fossils
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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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