Question 1

Mound-like structures that represent the remains of photosynthesizing cyanobacteria are ____.

Accepted Answer

A)   greenstone belts
B)   stromatolites
C)   back-arc basins
D)   cratons
E)   black smokersF) A) and C)
G) A) and D)

Question 2

Earth was a hot, barren, waterless planet during the Archean eon.

Accepted Answer

A) True 
 B)False

Question 3

The newly-formed Earth's atmosphere was very different from Earth's current atmosphere because it had ____.

Accepted Answer

A)   an abundance of mercury vapor
B)   an enormous amount of carbon dioxide, resulting in very hot temperatures due to greenhouse effect
C)   virtually no oxygen, a necessary component for the existence of animal life
D)   an enormous amount of methane and ammonia, which was never lost by the atmospheres of the outer planets
E)   virtually no nitrogen, the major component of today's atmosphereF) All of the above
G) B) and C)

Question 4

____________________ organisms rely on external sources of nutrients.

Accepted Answer

The answer of ____________________ organisms rely on external sources of...

Question 5

____________________ refers to the formation of life from non-living matter.

Accepted Answer

The answer of ____________________ refers to the formation of life...

Question 6

Over time, Earth's rotation rate has slightly increased.

Accepted Answer

A) True 
 B)False

Question 7

What are two reasons that Earth lost its first atmosphere of hydrogen and helium?

Accepted Answer

1. Hydrogen and helium are extremely lig...

Question 8

Detrital zircon from sedimentary rocks found in Australia yields an age of 4.4 billion years, which indicates that rocks formed on Earth at least 4.4 billion years ago.

Accepted Answer

A) True 
 B)False

Question 9

Why does Earth have plate tectonics?

Accepted Answer

A)   denser oceanic crust (relative to continental crust) 
B)   thicker oceanic crust (relative to continental crust) 
C)   relatively rapid cooling
D)   convection currents and released heat deep within the mantle
E)   active volcanoes (in the past and present) F) A) and D)
G) A) and E)

Question 10

Cyanobacteria (blue-green algae) are an example of a heterotrophic organism.

Accepted Answer

A) True 
 B)False

Question 11

The ____________________ forms the exposed part of the craton in North America.

Accepted Answer

The answer of The ____________________ forms the exposed part of...

Question 12

During the process of ____________________, rising magma from a subducting plate or mantle plume accumulates beneath a continent.

Accepted Answer

The answer of During the process of ____________________, rising magma...

Question 13

Early in Earth history, the Sun was less luminous, which should have caused Earth to be much colder and all water to be frozen. Yet all evidence points to the presence of liquid water on Earth. Give two explanations that could resolve the "faint young sun paradox."

Accepted Answer

1. There was a strong greenhouse effect ...

Question 14

Describe prokaryotic cells and discuss the role they played in early Earth.

Accepted Answer

A prokaryotic cell lacks a nucleus and o...

Question 15

Organisms that do not depend on oxygen for growth are ____.

Accepted Answer

A)   eukaryotic
B)   abiogenic
C)   abyssal
D)   prokaryotic
E)   anaerobicF) A) and E)
G) D) and E)

Question 16

Greenstone belts are composed of sedimentary and volcanic rocks.

Accepted Answer

A) True 
 B)False

Question 17

Both the intracontinental rift and back-arc basin model are based on volcanism associated with mantle plumes.

Accepted Answer

A) True 
 B)False

Question 18

The nucleus or foundation of a continent is a(n)  ____.

Accepted Answer

A)   stromatolite
B)   greenstone belt
C)   Permian province
D)   craton
E)   orogenic beltF) C) and D)
G) B) and E)

Question 19

When it first formed, the Sun was 75 times more luminous than it is now.

Accepted Answer

A) True 
 B)False

Question 20

Earth's first atmosphere likely consisted of ____________________ and ____________________, the most abundant gasses in the universe.

Accepted Answer

hydrogen, ...

Exam 8: Precambrian Earth and Life History the Hadean and the Archean Eon

Detrital zircon from sedimentary rocks found in Australia yields an age of 4.4 billion years, which indicates that rocks formed on Earth at least 4.4 billion years ago.

Correct AnswerverifiedShow Answer

Cyanobacteria (blue-green algae) are an example of a heterotrophic organism.

Correct AnswerverifiedShow Answer

The ____________________ forms the exposed part of the craton in North America.

Correct AnswerverifiedShow Answer

____________________ organisms rely on external sources of nutrients.

Correct AnswerverifiedShow Answer

Organisms that do not depend on oxygen for growth are ____.

Correct AnswerverifiedShow Answer

Mound-like structures that represent the remains of photosynthesizing cyanobacteria are ____.

Correct AnswerverifiedShow Answer

Both the intracontinental rift and back-arc basin model are based on volcanism associated with mantle plumes.

Correct AnswerverifiedShow Answer

What are two reasons that Earth lost its first atmosphere of hydrogen and helium?

Correct Answerverified1. Hydrogen and helium are extremely lig...View AnswerShow Answer

Greenstone belts are composed of sedimentary and volcanic rocks.

Correct AnswerverifiedShow Answer

Earth was a hot, barren, waterless planet during the Archean eon.

Correct AnswerverifiedShow Answer

Over time, Earth's rotation rate has slightly increased.

Correct AnswerverifiedShow Answer

During the process of ____________________, rising magma from a subducting plate or mantle plume accumulates beneath a continent.

Correct AnswerverifiedShow Answer

Describe prokaryotic cells and discuss the role they played in early Earth.

Correct AnswerverifiedA prokaryotic cell lacks a nucleus and o...View AnswerShow Answer

The newly-formed Earth's atmosphere was very different from Earth's current atmosphere because it had ____.

Correct AnswerverifiedShow Answer

____________________ refers to the formation of life from non-living matter.

Correct AnswerverifiedShow Answer

The nucleus or foundation of a continent is a(n) ____.

Correct AnswerverifiedShow Answer

Earth's first atmosphere likely consisted of ____________________ and ____________________, the most abundant gasses in the universe.

Correct Answerverifiedhydrogen, ...View AnswerShow Answer

When it first formed, the Sun was 75 times more luminous than it is now.

Correct AnswerverifiedShow Answer

Why does Earth have plate tectonics?

Correct AnswerverifiedShow Answer

Early in Earth history, the Sun was less luminous, which should have caused Earth to be much colder and all water to be frozen. Yet all evidence points to the presence of liquid water on Earth. Give two explanations that could resolve the "faint young sun paradox."

Correct Answerverified1. There was a strong greenhouse effect ...View AnswerShow Answer

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1. Hydrogen and helium are extremely lig...
View Answer

Correct Answer
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Correct Answer
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A prokaryotic cell lacks a nucleus and o...
View Answer

Correct Answer
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Earth's first atmosphere likely consisted of and , the most abundant gasses in the universe.

Correct Answer
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hydrogen, ...
View Answer

Correct Answer
verified

Correct Answer
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Correct Answer
verified
1. There was a strong greenhouse effect ...
View Answer