Question 1

Numerical age dates based on radioactivity are very important for studying Precambrian geologic history because fossils are rare or absent.

Accepted Answer

A) True 
 B)False

Question 2

The percentage of radioactive atoms that decay during one half-life is always the same.

Accepted Answer

A) True 
 B)False

Question 3

We now live in the ________ era.

Accepted Answer

The answer of We now live in the ________ era....

Question 4

About 88 percent of geologic time is represented by the time span called the ________.

Accepted Answer

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

Question 5

The Paleozoic is the era of "ancient life."

Accepted Answer

A) True 
 B)False

Question 6

What is the name of a Phanerozoic era that means ancient life?

Accepted Answer

The answer of What is the name of a Phanerozoic...

Question 7

Which of the following best characterizes an angular unconformity?

Accepted Answer

A)  Tilted strata lie below the unconformity; bedding in younger strata above is parallel to the unconformity. 
B)  Horizontal lava flows lie below the unconformity and horizontal, sedimentary strata lie above. 
C)  The discordant boundary between older strata and an intrusive body of granite. 
D)  Tilted strata lie below the unconformity with loose, unconsolidated soil above. 
A)  Tilted strata lie below the unconformity; bedding in younger strata above is parallel to the unconformity. 
B)  Horizontal lava flows lie below the unconformity and horizontal, sedimentary strata lie above. 
C)  The discordant boundary between older strata and an intrusive body of granite. 
D)  Tilted strata lie below the unconformity with loose, unconsolidated soil above.

Question 8

Which of the following denotes the divisions of the geologic time scale in correct order of decreasing lengths of time beginning with the longest time interval and ending with the shortest?

Accepted Answer

A)  eon, era, epoch, period 
B)  era, period, epoch, eon 
C)  eon, epoch, period, era 
D)  eon, era, period, epoch 
A)  eon, era, epoch, period 
B)  era, period, epoch, eon 
C)  eon, epoch, period, era 
D)  eon, era, period, epoch

Question 9

In the late 1700s James Hutton published his important work titled ________.

Accepted Answer

A)  Catastrophism 
B)  Principles of Geology 
C)  Modern Earth Science 
D)  Theory of the Earth 
A)  Catastrophism 
B)  Principles of Geology 
C)  Modern Earth Science 
D)  Theory of the Earth

Question 10

Strata above an angular unconformity were tilted before the older strata were eroded.

Accepted Answer

A) True 
 B)False

Question 11

The ratio of parent to daughter isotopes in a radioactive decay process is 0.40. How many half-lives have elapsed since the material was 100% parent atoms?

Accepted Answer

A)  less than l 
B)  more than 3 
C)  between l and 2 
D)  between 2 and 3 
A)  less than l 
B)  more than 3 
C)  between l and 2 
D)  between 2 and 3

Question 12

Word Analysis. Examine the words and/or phrases for each question below and determine the relationship among the majority of words/phrases. Choose the option which does not fit the pattern.

Accepted Answer

A)  Uranium-238 
B)  Rubidium-87 
C)  Carbon-14 
D)  Potassium-40 
A)  Uranium-238 
B)  Rubidium-87 
C)  Carbon-14 
D)  Potassium-40

Question 13

All of geologic time prior to the beginning of the Paleozoic era is commonly referred to as the ________.

Accepted Answer

The answer of All of geologic time prior to the...

Question 14

What term denotes blocks of older rock enclosed in a body of younger igneous rock?

Accepted Answer

The answer of What term denotes blocks of older rock...

Question 15

Who is credited with formulating the doctrine of uniformitarianism?

Accepted Answer

A)  Aristotle 
B)  Lyell 
C)  Hutton 
D)  Playfair 
A)  Aristotle 
B)  Lyell 
C)  Hutton 
D)  Playfair

Question 16

A disconformity is an erosional unconformity with parallel beds or strata above and below.

Accepted Answer

A) True 
 B)False

Question 17

Sandstone strata and a mass of granite are observed to be in contact. Which of the following statements is correct geologically?

Accepted Answer

A)  The sandstone is younger if the granite contains sandstone inclusions. 
B)  The sandstone is younger if it shows evidence of contact metamorphism. 
C)  The granite is older if the sandstone contains pebbles of the granite. 
D)  The granite is older if it contains inclusions of sandstone. 
A)  The sandstone is younger if the granite contains sandstone inclusions. 
B)  The sandstone is younger if it shows evidence of contact metamorphism. 
C)  The granite is older if the sandstone contains pebbles of the granite. 
D)  The granite is older if it contains inclusions of sandstone.

Question 18

After two half-lives there is no longer any of the original radioactive material remaining.

Accepted Answer

A) True 
 B)False

Question 19

Which of the following refers to the investigative process by which geologists identify and match sedimentary strata and other rocks of the same ages in different areas?

Accepted Answer

A)  super matching 
B)  correlation 
C)  strata indexing 
D)  cross-access dating 
A)  super matching 
B)  correlation 
C)  strata indexing 
D)  cross-access dating

Question 20

Isotopes of what element are the stable, end products of both uranium decay series?

Accepted Answer

The answer of Isotopes of what element are the stable,...

Exam 11: Geologic Time

Numerical age dates based on radioactivity are very important for studying Precambrian geologic history because fossils are rare or absent.

The percentage of radioactive atoms that decay during one half-life is always the same.

We now live in the ________ era.

About 88 percent of geologic time is represented by the time span called the ________.

The Paleozoic is the era of "ancient life."

What is the name of a Phanerozoic era that means ancient life?

Which of the following best characterizes an angular unconformity?

Which of the following denotes the divisions of the geologic time scale in correct order of decreasing lengths of time beginning with the longest time interval and ending with the shortest?

In the late 1700s James Hutton published his important work titled ________.

Strata above an angular unconformity were tilted before the older strata were eroded.

The ratio of parent to daughter isotopes in a radioactive decay process is 0.40. How many half-lives have elapsed since the material was 100% parent atoms?

Word Analysis. Examine the words and/or phrases for each question below and determine the relationship among the majority of words/phrases. Choose the option which does not fit the pattern.

All of geologic time prior to the beginning of the Paleozoic era is commonly referred to as the ________.

What term denotes blocks of older rock enclosed in a body of younger igneous rock?

Who is credited with formulating the doctrine of uniformitarianism?

A disconformity is an erosional unconformity with parallel beds or strata above and below.

Sandstone strata and a mass of granite are observed to be in contact. Which of the following statements is correct geologically?

After two half-lives there is no longer any of the original radioactive material remaining.

Which of the following refers to the investigative process by which geologists identify and match sedimentary strata and other rocks of the same ages in different areas?

Isotopes of what element are the stable, end products of both uranium decay series?

Introduction to Earth Science

Minerals: Building Blocks of Rocks

Rocks: Materials of the Solid Earth

Weathering, Soil, and Mass Wasting

Running Water and Groundwater

Glaciers, Deserts, and Winds

Plate Tectonics: a Scientific Theory Unfolds

Earthquakes and Earths Interior

Volcanoes and Other Igneous Activity

Earths Evolution Through Geologic Time

The Ocean Floor

Ocean Water and Ocean Life

The Dynamic Ocean

The Atmosphere: Composition, Structure, and Temperature

Moisture, Clouds, and Precipitation

Air Pressure and Wind

Weather Patterns and Severe Weather

Climate

Origin of Modern Astronomy

Touring Our Solar System

Light, Astronomical Observations, and the Sun

Beyond Our Solar System

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