Geologic Time Quiz Review

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Are you ready for tomorrow’s quiz?
A. YES! The study guide and the practice test helped a ton!
B. I think so…but I should look over my notes some more.
C. I am lost.
Molds, casts, coprolites, and petrified
wood are all examples of ________.
A.
Disconformities
B.
Radioactive isotopes
C.
fossils
D.
unconformities
The youngest rock layer in an
undisturbed rock sequence occurs ___.
A.
At the top of the sequence
B.
Above the sedimentary rock layer
C.
At the bottom of the sequence
D.
Above the unconformity
Radioactive dating enables geologists
to determine
A.
The absolute ages of fossils
B.
The half-life of a fossil organisms
C.
The age of the atoms in a rock
D.
The relative ages of fossils
The amount of time it takes for onehalf of the original amount of an
isotope to decay is known as its ____.
A.
Radioactivity
B.
Half-life
C.
Correlation
D.
Period
Cyanobacteria use the process of
photosynthesis to produce energy, and
_____is given off as a waste product.
A.
Carbon dioxide
B.
Nitrogen
C.
Hydrogen
D.
Oxygen
Evolution is the process by which
organisms ______.
A.
Leave behind evidence of their existence.
B.
Adapt to changes in their environments
C.
Digest and grind their food
D.
Become preserved by mineral replacement
Mummified animals found in dry caves
can be examples of fossils with _____.
A.
Superposition
B.
Altered hard parts
C.
Original preservation
D.
Premineralization
List the following units of geologic time
in order from shortest to longest.
A.
epoch
B.
era
C.
eon
D.
period
Which of the following is used to
determine the relative age of a rock?
A.
Radiometric dating
B.
Correlation
C.
Relative-age dating
D.
Premineralization
When part of the rock record is
destroyed, the erosional gap that forms
is a(n) _______.
A.
Superposition
B.
Key bed
C.
Inclusion
D.
Unconformity
Index fossils are useful to geologists if
the fossils _____.
A.
Are scarce
B.
Are not easily recognized
C.
Have lived over a short period of time
D.
Are not widely distributed geographically.
Which of the following is used to
determine the absolute age of a rock?
A.
Radiometric dating
B.
Correlation
C.
Relative-age dating
D.
Premineralization
Which layer in this diagram is the
oldest?
A.
K
B.
P
C.
Q
D.
O
Which layer in this diagram is the
youngest?
A.
K
B.
P
C.
Q
D.
O
Layer P is called a(n) ______________.
A.
Unconformity
B.
Fault
C.
Inclusion
D.
Intrusion
List the following rock layers in order
from oldest to youngest.
A.
H
B.
J
C.
P
D.
O
E.
L
Short Answer Questions: Type your
response using your keypad.
PRACTICE: What is the room number
of this classroom?
257
1
Earth is _______ billion years old.
4.6
0.1
The half-life of carbon-14 is 5370 years. A
sample contains 180 grams of carbon initially.
Now it contains 11.25 grams. How many halflives have passed?
A.
2
B.
3
C.
4
D.
5
The half-life of carbon-14 is 5370 years. A
sample contains 210 grams of carbon
initially. How much will be left after 3 halflives?
A.
105 grams
B.
52.5 grams
C.
26.25 grams
D.
13.125 grams
Which geologic principle is used when a
geologist observes an outcrop of rocks and
determines the bottom layers is the oldest?
A. Uniformitarianism
B. Original horizontality
C. superposition
D. inclusion
Which of the following is NOT a likely
source of the Precambrian Earth’s heat?
A. radioactivity
B. Asteroid impact
C. Increased solar activity
D. Gravitational contraction
Remains of organisms in rocks are ____.
A. Half-lives
B. fossils
C. unconformities
D. extinctions
Radiometric dating indicates that Earth
is ______ years old.
A. 2000
B. 5000
C. 3.5 billion
D. 4.6 billion
If there is 16 grams of Carbon-14 were
in the original organism, how much will
be left after 2 half-lives?
4
1
The next smaller division of geologic
time after the era is a(n)
A. period
B. stage
C. epoch
D. eon
One of the earliest forms of life on
Earth was the _____.
A. gymnosperm
B. cyanobacteria
C. angiosperm
D. dinosaur
Dinosaurs lived during the ____ Era.
A. Precambrian
B. Paleozoic
C. Mesozoic
D. Cenozoic

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