Question 1

Which factors likely played a role in the development of early life?

Accepted Answer

A)  presence of carbon, hydrogen, nitrogen, and oxygen 
B)  ultraviolet light 
C)  lightning 
D)  ultraviolet light and lightning only 
E)  all of these 
A)  presence of carbon, hydrogen, nitrogen, and oxygen 
B)  ultraviolet light 
C)  lightning 
D)  ultraviolet light and lightning only 
E)  all of these

Question 2

By ____ years ago,much of Greenland,central Canada,and the north central United States formed one large craton.

Accepted Answer

A)  1.8 million 
B)  2.0 billion 
C)  1.6 billion 
D)  1.6 million 
E)  1.8 billion 
A)  1.8 million 
B)  2.0 billion 
C)  1.6 billion 
D)  1.6 million 
E)  1.8 billion

Question 3

The buildup of cyanobacteria entrapping sand grains explains the origin of stromatolites.

Accepted Answer

A) True 
 B)False

Question 4

The large Proterozoic landmass known as Laurentia was composed of ____.

Accepted Answer

A)  Europe, Asia, Scandinavia, NW Scotland 
B)  North America, South America, Greenland, Baltic Shield 
C)  North America, Greenland, NW Scotland, Baltic Shield 
D)  Greenland, NW Scotland, Baltic Shield, Europe 
E)  Greenland, Iceland, Nova Scotia, Baltic Shield 
A)  Europe, Asia, Scandinavia, NW Scotland 
B)  North America, South America, Greenland, Baltic Shield 
C)  North America, Greenland, NW Scotland, Baltic Shield 
D)  Greenland, NW Scotland, Baltic Shield, Europe 
E)  Greenland, Iceland, Nova Scotia, Baltic Shield

Question 5

Why are ultramafic volcanics rare in rocks that are much younger than Archean in age?

Accepted Answer

Earth has cooled from its earl

Question 6

All but which of the following are features of greenstone belts?

Accepted Answer

A)  volcanic and sedimentary rocks 
B)  key index fossil assemblages 
C)  granitic intrusions 
D)  complex folding and faulting 
E)  abundant chlorite 
A)  volcanic and sedimentary rocks 
B)  key index fossil assemblages 
C)  granitic intrusions 
D)  complex folding and faulting 
E)  abundant chlorite

Question 7

What are monomers?

Accepted Answer

simple org

Question 8

The Precambrian comprises what percent of geologic time?

Accepted Answer

A)  99 percent 
B)  88 percent 
C)  77 percent 
D)  66 percent 
E)  55 percent 
A)  99 percent 
B)  88 percent 
C)  77 percent 
D)  66 percent 
E)  55 percent

Question 9

What are molecules which are intermediate between inorganic compounds and living organisms called?

Accepted Answer

A)  protobionts 
B)  proteinoids 
C)  bacteria 
D)  amino acids 
E)  monomers 
A)  protobionts 
B)  proteinoids 
C)  bacteria 
D)  amino acids 
E)  monomers

Question 10

What is an anaerobic organism?

Accepted Answer

One that d

Question 11

The assemblage of sandstone-carbonate-shale is probably indicative of ____________________ (in depth)water shelf environment.

Accepted Answer

The answer of The assemblage of sandstone-carbonate-shale is probably indicative...

Question 12

Early gases which had begun to accumulate around Earth during the Early Archean were lost because of a lack of a(n)____________________.

Accepted Answer

The answer of Early gases which had begun to accumulate...

Question 13

The enormous amount of banded iron formation deposited during the period of 2.5 to 2.0 billion years ago signifies a transition from oxidizing to reducing atmosphere on Earth.

Accepted Answer

A) True 
 B)False

Question 14

Banded iron formations,although rich in iron,are not economical to mine because of the chert.

Accepted Answer

A) True 
 B)False

Question 15

The Sudbury Basin is one of the richest mining areas in the world because it

Accepted Answer

A)  is a banded-iron formation. 
B)  is a meteorite impact site. 
C)  is a layered intrusion. 
D)  is a stromatolite. 
E)  all of these 
A)  is a banded-iron formation. 
B)  is a meteorite impact site. 
C)  is a layered intrusion. 
D)  is a stromatolite. 
E)  all of these

Question 16

In order for monomers to polymerize,they need to be immersed in an aqueous solution.

Accepted Answer

A) True 
 B)False

Question 17

What do the Ediacaran fauna represent,and why are they important?

Accepted Answer

The Ediacaran fauna represent the first

Question 18

Which is the correct sequence of events in the development of a back-arc basin style greenstone belt?
1) granitic intrusion and metamorphism
2)basin opening
3)basin closing
4)extension
5)compression
6)volcanism and sedimentation

Accepted Answer

A)  2, 4, 6, 3, 5, 1 
B)  2, 6, 5, 4, 3, 1 
C)  6, 4, 2, 5, 1, 3 
D)  6, 1, 2, 4, 3, 5 
E)  1, 2, 3, 4, 5, 6 
A)  2, 4, 6, 3, 5, 1 
B)  2, 6, 5, 4, 3, 1 
C)  6, 4, 2, 5, 1, 3 
D)  6, 1, 2, 4, 3, 5 
E)  1, 2, 3, 4, 5, 6

Question 19

Archean and Proterozoic greenstone belts formed in similar tectonic settings.

Accepted Answer

A) True 
 B)False

Question 20

How does photochemical dissociation of water vapor occur?

Accepted Answer

Water molecules are

Exam 19: Precambrian Earth and Life History

Which factors likely played a role in the development of early life?

By ____ years ago,much of Greenland,central Canada,and the north central United States formed one large craton.

The buildup of cyanobacteria entrapping sand grains explains the origin of stromatolites.

The large Proterozoic landmass known as Laurentia was composed of ____.

Why are ultramafic volcanics rare in rocks that are much younger than Archean in age?

All but which of the following are features of greenstone belts?

What are monomers?

The Precambrian comprises what percent of geologic time?

What are molecules which are intermediate between inorganic compounds and living organisms called?

What is an anaerobic organism?

The assemblage of sandstone-carbonate-shale is probably indicative of ____________________ (in depth)water shelf environment.

Early gases which had begun to accumulate around Earth during the Early Archean were lost because of a lack of a(n)____________________.

The enormous amount of banded iron formation deposited during the period of 2.5 to 2.0 billion years ago signifies a transition from oxidizing to reducing atmosphere on Earth.

Banded iron formations,although rich in iron,are not economical to mine because of the chert.

The Sudbury Basin is one of the richest mining areas in the world because it

In order for monomers to polymerize,they need to be immersed in an aqueous solution.

What do the Ediacaran fauna represent,and why are they important?

Which is the correct sequence of events in the development of a back-arc basin style greenstone belt? 1) granitic intrusion and metamorphism 2)basin opening 3)basin closing 4)extension 5)compression 6)volcanism and sedimentation

Archean and Proterozoic greenstone belts formed in similar tectonic settings.

How does photochemical dissociation of water vapor occur?

Understanding Earth: A Dynamic and Evolving Planet

Plate Tectonics: A Unifying Theory

Minerals The Building Blocks of Rocks

Igneous Rocks and Plutons

Volcanoes and Volcanism

Weathering, Erosion, and Soil

Sediment and Sedimentary Rocks

Metamorphism and Metamorphic Rocks

Earthquakes and Earth's Interior

Deformation,Mountain Building,and Earth's Crust

Mass Wasting

Running Water Streams and Rivers

Groundwater

Glaciers and Glaciation

The Work of Wind and Deserts

Oceans, Shorelines, and Shoreline Processes

Geologic Time: Concepts and Principles

Organic Evolution The Theory and Its Supporting Evidence

Paleozoic Earth History

Paleozoic Life History

Mesozoic Earth and Life History

Cenozoic Earth and Life History

Geology in Perspective

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