Ch 8 Review Jeopardy
Unconformi
ties
Half
Lives
Laws
Relative/
Absolute
Age
Fossils
100
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Break in geologic time
Answer
Unconformity
Home
Stratified rock over
unstratified rock
Answer
Nonconformity
Home
Layer of sedimentary rock
over an older, eroded layer
of rock
Answer
Disconformity
Home
True or False:
Unconformities determine
absolute age
Answer
false
Home
Which law tells us that all
rocks beneath an
unconformity are older
than rocks above the
unconformity?
Answer
Law of Superposition
Home
In radiometric dating, what is
the original material called?
(the radioactive material)
Answer
Parent isotope
Home
What do we use to date
fossils younger than
70,000 years?
Answer
Carbon-14 dating
Home
In radiometric dating,
scientists compare the
proportion of a
radioactive parent
isotope to a stable:
___________
Answer
Daughter isotope
Home
Method of determining
the absolute age of an
object by comparing the
relative percentages of a
radioactive and stable
isotope
Answer
Radiometric dating
Home
Radioactive decay
happens at a relatively
____________ rate.
Answer
Constant
.
Home
States that
sedimentary rocks left
undisturbed will
remain in horizontal
layers
Answer
Principle of
horizontality
Home
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
Home
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
Home
Principle that geologic
processes that occurred in
the past can be explained
by current geologic
processes
Answer
Uniformitariansim
Home
Assuming a fault is
younger than 2 layers its
cutting through is
explained by this law
Answer
Crosscutting
Relationships
Home
The numeric age of an
object is called: ______
Answer
Absolute age
Home
These layers are used to
find absolute age and are
often found in glacial
lakes
Answer
Varves
Home
The age of an object
in relation to ages of
other objects
Answer
Relative Age
Home
Measuring the rate at
which a stream erodes
its bed estimates what
kind of age?
Answer
Absolute Age
Home
Arrangement of layer in which coarse
and heavy particles are located in the
bottom layers
Answer
Graded Bedding
Home
True or False: bacteria can
not survive freezing
temperatures
Answer
True!
Home
Almost all fossils are
discovered in what kind of
rock?
Answer
Sedimentary
Home
Fossilized dung or waste
Answer
Coprolite
Home
Fossilized evidence of past
animal movement such as
tracks and foot prints
Answer
Trace Fossil
Home
Fossil used to date rock
layers of a particular
geologic age
Answer
Index Fossil
Home
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Ch 8 Rock Record Jeopardy