Question 1

Briefly explain the difference between the tectonic setting of shield areas during the Precambrian and since the onset of the Phanerozoic.

Accepted Answer

During the Precambrian,the areas that are now part of the shield were tectonically active with volcanism,metamorphism,and folding and faulting.During that time,continents grew by accretion.Since the beginning of the Phanerozoic,these areas have been tectonically inactive and have been eroded to topographically flat,stable areas.

Question 2

In the back-arc basin model for greenstone belt evolution,metamorphism and deformation are closely tied to basin opening.

Accepted Answer

A) True 
 B)False  False

Question 3

Proterozoic layered igneous complexes are important sources for pegmatites.

Accepted Answer

A) True 
 B)False  False

Question 4

The process by which gases within Earth are emitted and eventually accumulate into an atmosphere is called ____________________.

Accepted Answer

The answer of The process by which gases within Earth...

Question 5

The Grenville orogen probably resulted from closure of a(n)__________,the final stage in a __________ cycle.

Accepted Answer

The answer of The Grenville orogen probably resulted from closure...

Question 6

Archean age rocks are important sources for all but which of the following commodities?

Accepted Answer

A)  chrome 
B)  gold 
C)  platinum 
D)  lead 
E)  nickel 
A)  chrome 
B)  gold 
C)  platinum 
D)  lead 
E)  nickel

Question 7

The Archean atmosphere could be described as what?

Accepted Answer

A)  oxygen rich 
B)  nitrogen rich 
C)  ozone rich 
D)  oxygen deficient 
E)  carbon dioxide rich 
A)  oxygen rich 
B)  nitrogen rich 
C)  ozone rich 
D)  oxygen deficient 
E)  carbon dioxide rich

Question 8

The ____________________ forms the core of North America and has been tectonically ____________________.

Accepted Answer

Canadian S

Question 9

Evidence for oxygen deficient atmosphere during the Archean includes the presence of detrital ____________________ and ____________________ in ____________________ rocks.

Accepted Answer

pyrite,ura

Question 10

The deposition of banded iron formations primarily occurred about ______ to ______ billion years ago.

Accepted Answer

The answer of The deposition of banded iron formations primarily...

Question 11

Sedimentary rocks are abundant in the ____ portion of greenstone belts and consist largely of ____ and ____.

Accepted Answer

A)  bottom, argillite, graywacke 
B)  upper, argillite, graywacke 
C)  middle, argillite, graywacke 
D)  top, argillite, limestone 
E)  bottom, argillite, limestone. 
A)  bottom, argillite, graywacke 
B)  upper, argillite, graywacke 
C)  middle, argillite, graywacke 
D)  top, argillite, limestone 
E)  bottom, argillite, limestone.

Question 12

There is chemical evidence that life appeared by ____ and fossils by ____.

Accepted Answer

A)  3.8 billion years, 2.5 billion years 
B)  4.6 billion years, 2.5 billion years 
C)  3.8 million years, 3.5 million years 
D)  3.8 billion years, 3.5 billion years 
E)  4.6 million years, 3.5 million years 
A)  3.8 billion years, 2.5 billion years 
B)  4.6 billion years, 2.5 billion years 
C)  3.8 million years, 3.5 million years 
D)  3.8 billion years, 3.5 billion years 
E)  4.6 million years, 3.5 million years

Question 13

Banded iron formations are composed of almost 99 percent silica with only minor iron impurities that give a streaked or banded appearance.

Accepted Answer

A) True 
 B)False

Question 14

All known Proterozoic animals were soft-bodied.

Accepted Answer

A) True 
 B)False

Question 15

What is symbiosis?

Accepted Answer

Symbiosis is the liv

Question 16

What does the appearance of red beds in the geologic record indicate about the atmosphere?

Accepted Answer

The answer of What does the appearance of red beds...

Question 17

What are time divisions in the Precambrian based on?

Accepted Answer

A)  distinct fossil assemblages 
B)  metamorphic assemblages 
C)  radiometric age dates 
D)  time-stratigraphic units 
E)  none of these 
A)  distinct fossil assemblages 
B)  metamorphic assemblages 
C)  radiometric age dates 
D)  time-stratigraphic units 
E)  none of these

Question 18

All organisms are composed mostly of all but which of the following?

Accepted Answer

A)  oxygen 
B)  nitrogen 
C)  calcium 
D)  carbon 
E)  hydrogen 
A)  oxygen 
B)  nitrogen 
C)  calcium 
D)  carbon 
E)  hydrogen

Question 19

What are prokaryotic organisms?

Accepted Answer

They are unicellular

Question 20

Areas of buried shield rock and younger sedimentary cover are collectively called ____________________,which are tectonically ____________________ and ____________________.

Accepted Answer

cratons,in

Exam 19: Precambrian Earth and Life History

Briefly explain the difference between the tectonic setting of shield areas during the Precambrian and since the onset of the Phanerozoic.

In the back-arc basin model for greenstone belt evolution,metamorphism and deformation are closely tied to basin opening.

Proterozoic layered igneous complexes are important sources for pegmatites.

The process by which gases within Earth are emitted and eventually accumulate into an atmosphere is called ____________________.

The Grenville orogen probably resulted from closure of a(n)__________,the final stage in a __________ cycle.

Archean age rocks are important sources for all but which of the following commodities?

The Archean atmosphere could be described as what?

The ____________________ forms the core of North America and has been tectonically ____________________.

Evidence for oxygen deficient atmosphere during the Archean includes the presence of detrital ____________________ and ____________________ in ____________________ rocks.

The deposition of banded iron formations primarily occurred about ______ to ______ billion years ago.

Sedimentary rocks are abundant in the ____ portion of greenstone belts and consist largely of ____ and ____.

There is chemical evidence that life appeared by ____ and fossils by ____.

Banded iron formations are composed of almost 99 percent silica with only minor iron impurities that give a streaked or banded appearance.

All known Proterozoic animals were soft-bodied.

What is symbiosis?

What does the appearance of red beds in the geologic record indicate about the atmosphere?

What are time divisions in the Precambrian based on?

All organisms are composed mostly of all but which of the following?

What are prokaryotic organisms?

Areas of buried shield rock and younger sedimentary cover are collectively called ____________________,which are tectonically ____________________ and ____________________.

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

Filters

The Grenville orogen probably resulted from closure of a(n),the final stage in a cycle.

The forms the core of North America and has been tectonically .

Evidence for oxygen deficient atmosphere during the Archean includes the presence of detrital and in rocks.

The deposition of banded iron formations primarily occurred about to billion years ago.

Sedimentary rocks are abundant in the portion of greenstone belts and consist largely of and .

There is chemical evidence that life appeared by and fossils by .

Areas of buried shield rock and younger sedimentary cover are collectively called ,which are tectonically and .