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Review for Unit 7 & 8 Test

Total questions: 61

Worksheet time: 1hrs 1mins

Name
Class
Date
1.

Which of the following organizes the divisions of geologic time from longest to shortest?

a)

eons, eras, periods, epochs

b)

epochs, periods, eras, eons

c)

periods, eons, epochs, eras

d)

eras, epochs, eons, periods

2.

Which of the following is used as evidence to construct the geologic time scale?

a)

fossils

b)

radiometric age data

c)

comparative studies of different rock sequences

d)

all of the above

3.

Which of the following is NOT a division of geologic time?

a)

eons

b)

periods

c)

generations

d)

epochs

4.

Which of the following is NOT a Precambrian eon?

a)

Hadean

b)

Phanerozoic

c)

Archean

d)

Proterozoic

5.

Iridium is an element that is common in meteors bur very rare on Earth. An iridium layer 65.5 million years old has been discovered in rock layers in many different locations all over the world. For which of the following hypotheses does this discovery provide evidence?

a)

The supercontinent Pangaea began to break apart during the Mezozoic Era.

b)

A glaciation event caused the mass extinction that marks the end of the Ordovician period.

c)

An impact event caused the mass extinction that marks the end of the Cretaceous period.

d)

The "Cambrian Explosion" that marks the evolution of complex organisms happened at the beginning of the Phanerozoic eon.

6.

Which of the following would be an example of evidence that could be used to construct the geologic time scale?

a)

a geologic event observed in different rock sequences around the world

b)

index fossils

c)

radiometric dating of rocks in an impact crater

d)

all of the above

7.

In which time period are we currently living?

a)

Precambrian Time

b)

Paleozoic Era

c)

Mesozoic Era

d)

Cenozoic Era

8.

Dinosaurs, small mammals, and birds are found in this time period.

a)

Precambrian

b)

Paleozoic

c)

Mesozoic

d)

Cenozoic

9.

What are fossils that are abundant, easily recognizable, short lived, and widespread called?

a)

Preserved fossils

b)

Index fossils

c)

Imprints

d)

Radioactive dating

10.

The Law of Superposition states

a)

Younger rocks layers are on top of older rock layers

b)

Fossils are found in sedimentary rocks

c)

Older rock layers are on top of younger rock layers

d)

Absolute age dating

11.

Which era was the longest, taking up 88% of geologic time?

a)

Precambrian

b)

Paleozoic

c)

Mesozoic

d)

Cenozoic

12.

What does absolute age tell us about a rock layer or fossil?

a)

The 'exact' age of a fossil determined by radiometric dating

b)

The relative age of a fossil determined by radiometric dating

c)

Younger rock layers sit on top of older rock layers

d)

Older rock layers sit on top of younger rock layers

13.

Which fossil would make the best index fossil?

a)

Beetle

b)

Flower

c)

Frog

d)

Fish

14.

What two methods are used for determining the age of rocks and fossils?

a)

Relative and Absolute Dating

b)

Carbon and Water Dating

c)

Sedimentary and Igneous Rocks

d)

Spatial and Layered Dating

15.

Use relative age dating to put the rock layers in correct order from oldest to youngest.

a)

B, D, A, E, C

b)

C, E, D, A, B

c)

A, C, E, D, B

d)

C, E, D, B, A

16.

Marine plants and invertebrates were abundant during which era?

a)

Precambrian

b)

Paleozoic

c)

Mesozoic

d)

Cenozoic

17.

Which is the youngest rock layer?

a)

Siltstone

b)

Conglomerate

c)

Mudstone

d)

Limestone

18.

Which rock layer is oldest from Site 1?

a)

G

b)

B

c)

A

d)

E

19.

Which of the fossils is the oldest?

a)

Dinosaur

b)

Bird

c)

Shell

d)

Ammonite

20.

What does relative age tell us about a rock layer or fossil?

a)

The age of one rock layer or fossil compared to another.

b)

The relative age of a fossil determined by radiometric dating

c)

Younger rock layers sit on top of older rock layers

d)

Older rock layers sit on top of younger rock layers

21.
Which period are we currently in?
a)
Quaternary
b)
Holocene
c)
Jurassic
d)
Tertiary
22.
Which layer is a result of an igneous intrusion?
a)
B
b)
C
c)
D
d)
E
23.
Paleontologists infer that the earth is approximately how many years old?
a)
4.5 million years
b)
450 million years
c)
450 billion years
d)
4.5 billion years
24.

The Jurassic period is in the Paleozoic era.

a)

True

b)

False

25.

During what PERIOD were the first flowering plants found?

a)

Jurassic

b)

Creataceous

c)

Triassic

d)

Mesozoic

26.

Which period does NOT belong to the Mesozoic era?

a)

Cretaceous

b)

Devonian

c)

Jurassic

d)

Triassic

27.

What type of event usually marks the end of an Era

a)

A Mass Extinction

b)

A Quinceanera

c)

An earthquake

d)

A Volcanic Eruption

28.

What are the four eras in order from OLDEST to NEWEST?

a)

Pre-Cambrian, Paleozoic, Mesozoic, Cenozoic

b)

Pre-Cambrian, Mesozoic, Paleozoic, Cenozoic

c)

Cenozoic, Mesozoic, Paleozoic, Pre-Cambrian

d)

Mesozoic, Pre-Cambrian, Cenozoic, Paleozoic

29.

Scientists chose where units of geologic time began and ended based on the appearance or disappearance of life.

a)

true

b)

false

30.

90% of Earth’s history occurred during which era?

a)

Precambrian

b)

Paleozoic

c)

Mesozoic

d)

Cenozoic

31.

Which could contribute to a mass-extinction event?

a)

an earthquake

b)

a hot summer

c)

a hurricane

d)

a volcanic eruption

32.
The Triassic Period, the Jurassic Period, and the Cretaceous Period occurred in what era?
a)
Cenozoic
b)
Mesozoic
33.
 The Quaternary period, where humans first appeared, is in the Mesozoic era.
a)
True
b)
False
34.

In what time period did Pangaea, the super-continent, appear?

a)

Precambrian

b)

Paleozoic

c)

Mesozoic

d)

Cenozoic

35.

During this period Earth was flowing with lava, the core was unstable, and was the first Era of the Precambrian Eon.

a)

Paleozoic

b)

Hadean

c)

Archean

d)

Cenozoic

36.

The period of geologic time when the biodiversity of life on the planet increased dramatically was

a)

Jurassic

b)

Triassic

c)

Permian

d)

Cambrian

37.

The time when the first jawed fishes and amphibians appeared

a)

Devonian

b)

Jurassic

c)

Cambrian

d)

Hadean

38.

Order the Eons from oldest to youngest.

a)

Hadean

b)

Achaean

c)

Proterozoic

d)

Phanerozoic

1)
2)
3)
4)
39.

Arrange the Eras from oldest to youngest.

a)

Precambrian

b)

Paleozoic

c)

Mesozoic

d)

Cenozoic

1)
2)
3)
4)
40.

Arrange the Periods of the Paleozoic Eon (minus Cambrian) from oldest to youngest.

a)

Ordovician

b)

Silurian

c)

Devonian

d)

Carboniferous

e)

Permian

1)
2)
3)
4)
5)
41.

Arrange the Periods of the Mesozoic from oldest to youngest.

a)

Triassic

b)

Jurassic

c)

Cretaceous

1)
2)
3)
42.

Arrange the Periods of the Cenozoic from oldest to youngest

a)

Paleogene

b)

Neogene

c)

Quaternary

1)
2)
3)
43.
The rock formation labeled "P" is a(n)...
a)
fault
b)
intrusion
c)
inclusion
d)
unconformity
44.

Which layer is OLDER? Intrusion M or Layer D?

a)

Intrusion M

b)

Layer D

45.
A is older than layer C
a)
TRUE
b)
FALSE
46.

Which of the following is tue?

a)

A fault is younger than the rock layers that it goes through.

b)

A fault is older than the rock layers that it goes through.

c)

The rock layers are younger than the fault that cuts through it.

47.
What are the relative ages of the features in order from oldest to youngest?
a)
Limestone, Basalt, Fault, Siltstone
b)
Siltstone, Fault, Basalt, Limestone
c)
Limestone, Fault, Basalt, Siltstone
d)
Limestone, Siltstone, Fault, Basalt
48.

Which of the following is an example of a trace fossil?

a)

A skeleton preserved in a tar pit

b)

A footprint of an extinct animal

c)

A mummy buried in ice

d)

An insect preserved in amber

49.
Which of the following is the oldest?
a)
Layer L
b)
Intrusion D
c)
Intrusion H
d)
Layer E
50.
The length of time required for half of the radioactive atoms in a sample to decay is its...
a)
era
b)
age
c)
half-life
d)
eon
51.
Radiometric dating is possible because the rates of decay of radioactive isotopes _____.
a)
change over time
b)
change from place to place
c)
are constant
d)
vary widely
52.
If the half-life of a radioactive group of atoms is 100 years, then how old is the rock if there have been two half-lives?
a)
25 years
b)
200 years
c)
400 years
d)
800 years
53.
The original element that undergoes radioactive decay is known as the...
a)
daughter element
b)
half-life
c)
parent element
d)
carbon-14
54.
If 10 mg of iodine 131 is given to a patient, how much is left after 24 days? The half-life of iodine-131 is 8 days.
a)
1.25mg
b)
1.25g
c)
10g
d)
10mg
55.
The half-life of strontium-90 is 25 years. How much strontium-90 will remain after 100 years if the initial amount is 4.0 g?
a)
3.0g
b)
0.25mg
c)
0.3g
d)
0.25g
56.
What is the half-life of iodine-131?
a)
32 days
b)
8 days
c)
16 days
d)
24 days
57.

The % of the parent isotope remaining after 2 Half Lives.

a)

50%

b)

25%

c)

12.5%

d)

6.25%

58.

What is the Half life of this isotope?

a)

5 seconds

b)

10 seconds

c)

15 seconds

d)

20 seconds

59.

The element that is the product of radioactive decay is known as the...

a)

daughter element

b)

half-life

c)

parent element

d)

carbon-14

60.

Arrange the outcrops from oldest to youngest

a)

Outcrop II

b)

Outcrop I

c)

Outcrop III

1)
2)
3)
61.

Arrange the layers A through D and the fault line from oldest to youngest

a)

B/D

b)

C

c)

Fault x-y

d)

A

1)
2)
3)
4)

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