Question 1

Using the data in this table,calculate the number of half-lives that have passed for the granite (unit G on this table) ?

Accepted Answer

A)  1
B)  2
C)  3
D)  4
E)  5

Question 2

What would fossil ages from the geologic timescale and an isotopic age on the granite tell us about the age of the unconformity?

Accepted Answer

A)  The unconformity is older than the isotopic age of the granite.
B)  The unconformity is older than the age assigned to the fossils.
C)  The granite is younger than the unconformity.
D)  It is not possible to have fossils preserved so close to granite.
E)  None of these.

Question 3

What is a possible cause of the extinction event called the Great Dying?

Accepted Answer

A)  a meteorite impact that killed the dinosaurs
B)  a great outpouring of lava at the end of the Paleozoic
C)  a sudden increase in the oxygen content of the atmosphere during the Precambrian
D)  a new kind of super predator that devoured nearly all of the life in the oceans

Question 4

For which of the following resources do geologic ages help us explore?

Accepted Answer

A)  mineral deposits related to granites
B)  oil and gas
C)  groundwater
D)  all of these

Question 5

Which of the four sedimentary layers in this figure is the oldest?

Accepted Answer

A)  the layer on top
B)  the layers in the middle
C)  the layer on bottom
D)  there is not enough information to tell C

Question 6

What is a principle we use to determine the age of a landscape surface?

Accepted Answer

A)  A landscape surface must be older than any rocks onto which it is carved.
B)  A landscape surface is younger than any rock that is deposited on top of the surface.
C)  The highest river terrace is probably the youngest in age.
D)  A surface with a well-developed soil is probably older than a surface with no soil.

Question 7

Which of the following time periods were dinosaurs the dominant creatures?

Accepted Answer

A)  Cenozoic
B)  Mesozoic
C)  Paleozoic
D)  Precambrian

Question 8

What happened between deposition of units 1 and 2?

Accepted Answer

A)  erosion and weathering
B)  mineralization as expressed by the zone around the granite
C)  solidification of magma into granite
D)  all of these

Question 9

This art work shows life on the sea bottom,at a time when fishes and creatures with shells appeared on Earth.What time period is represented?

Accepted Answer

A)  Mesozoic
B)  Cenozoic
C)  Precambrian
D)  Paleozoic D

Question 10

This figure shows the main subdivisions of the geologic timescale.Which of these is the Mesozoic?

Accepted Answer

A)  A
B)  B
C)  C
D)  D

Question 11

What was the Cambrian explosion?

Accepted Answer

A)  a large volcano that went off in Wales,which the Romans called Cambria
B)  a meteorite impact that struck the north coast of the Yucatan Peninsula of Mexico
C)  a time when a meteorite collided with the center of a supercontinent,melting all the glaciers
D)  a time when many different types of creatures appeared on Earth

Question 12

Which of the following chapters in geologic time occurred before there were abundant animals with hard parts?

Accepted Answer

A)  Cenozoic
B)  Mesozoic
C)  Paleozoic
D)  Precambrian

Question 13

Upon what basis were the upper and lower boundaries of the Mesozoic Era defined?

Accepted Answer

A)  dramatic changes in the color of the rocks from green to tan
B)  major episodes of mountain building
C)  abrupt changes in the types of fossils,representing mass extinctions
D)  the discovery that a meteoroid impact may have killed the dinosaurs

Question 14

What kind of geologic feature is shown in this photograph?

Accepted Answer

A)  contact metamorphism
B)  unconformity
C)  desert varnish
D)  desert pavement
E)  none of these

Question 15

Which of the four numbered features on this figure is the youngest?

Accepted Answer

A)  1
B)  2
C)  3
D)  4

Question 16

Of the following numbered units,which is the youngest?

Accepted Answer

A)  unit 4
B)  unit 5
C)  unit 6
D)  unit 9
E)  unit 11 D

Question 17

If a rock started with 1,000 atoms of a parent but now contains 250 atoms,how many half lives have passed?

Accepted Answer

A)  .25 half lives
B)  .5 half lives
C)  1 half life
D)  2 half lives
E)  there is no way to tell

Question 18

Which of the following might help determine the age of the volcanic features in this figure?

Accepted Answer

A)  numeric ages
B)  how well the shapes of the volcanoes are preserved
C)  how well developed soil is on the lava flows
D)  all of these

Question 19

This figure has rock units and geologic features that are assigned letters that are not in any particular order.From the geologic relations,what is the oldest unit?

Accepted Answer

A)  limestone in the far right (unit K) 
B)  dike (unit 
D)  
C)  conglomerate (unit 
C)  
D)  lava flow (unit L) 
E)  granite (unit G)

Question 20

Where is the oldest layer in this tilted sequence of sedimentary rocks?

Accepted Answer

A)  at the top of the hill in the center of the photograph
B)  the darkest layers will be the oldest
C)  the layers on the lower left part of the photograph
D)  the layers on the right of the photograph

Exam 9: Geologic Time

Using the data in this table,calculate the number of half-lives that have passed for the granite (unit G on this table) ?

Correct AnswerverifiedShow Answer

What would fossil ages from the geologic timescale and an isotopic age on the granite tell us about the age of the unconformity?

Correct AnswerverifiedShow Answer

What is a possible cause of the extinction event called the Great Dying?

Correct AnswerverifiedShow Answer

For which of the following resources do geologic ages help us explore?

Correct AnswerverifiedShow Answer

Which of the four sedimentary layers in this figure is the oldest?

Correct AnswerverifiedC

What is a principle we use to determine the age of a landscape surface?

Correct AnswerverifiedShow Answer

Which of the following time periods were dinosaurs the dominant creatures?

Correct AnswerverifiedShow Answer

What happened between deposition of units 1 and 2?

Correct AnswerverifiedShow Answer

This art work shows life on the sea bottom,at a time when fishes and creatures with shells appeared on Earth.What time period is represented?

Correct AnswerverifiedD

This figure shows the main subdivisions of the geologic timescale.Which of these is the Mesozoic?

Correct AnswerverifiedShow Answer

What was the Cambrian explosion?

Correct AnswerverifiedShow Answer

Which of the following chapters in geologic time occurred before there were abundant animals with hard parts?

Correct AnswerverifiedShow Answer

Upon what basis were the upper and lower boundaries of the Mesozoic Era defined?

Correct AnswerverifiedShow Answer

What kind of geologic feature is shown in this photograph?

Correct AnswerverifiedShow Answer

Which of the four numbered features on this figure is the youngest?

Correct AnswerverifiedShow Answer

Of the following numbered units,which is the youngest?

Correct AnswerverifiedD

If a rock started with 1,000 atoms of a parent but now contains 250 atoms,how many half lives have passed?

Correct AnswerverifiedShow Answer

Which of the following might help determine the age of the volcanic features in this figure?

Correct AnswerverifiedShow Answer

This figure has rock units and geologic features that are assigned letters that are not in any particular order.From the geologic relations,what is the oldest unit?

Correct AnswerverifiedShow Answer

Where is the oldest layer in this tilted sequence of sedimentary rocks?

Correct AnswerverifiedShow Answer

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D

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D

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