Question 1

Which ocean formed as a direct result of the breakup of Pangaea?

Accepted Answer

A) Pacific 
B) Arctic 
C) Mediterranean 
D) Atlantic 
A) Pacific 
B) Arctic 
C) Mediterranean 
D) Atlantic

Question 2

The change from thinking the continents are stationary to understanding that the outer layer of the earth moves slowly nearly all of the time occurred primarily because ________.

Accepted Answer

A) we got space travel and could see the motions 
B) we improved our surveying instruments significantly 
C) we had two world wars and learned a lot from them about the oceans that explained how continents moved 
D) we began to make global observations that required recognition that the continents and oceans had not always been in their current positions 
A) we got space travel and could see the motions 
B) we improved our surveying instruments significantly 
C) we had two world wars and learned a lot from them about the oceans that explained how continents moved 
D) we began to make global observations that required recognition that the continents and oceans had not always been in their current positions

Question 3

The oldest rocks of the oceanic crust are found in deep ocean trenches far away from active,mid-ocean ridges.

Accepted Answer

A) True 
 B)False

Question 4

The San Andreas fault zone in California is an example of ________.

Accepted Answer

A) a transform plate boundary 
B) a continental rift 
C) a divergent plate boundary 
D) an ocean-continent collision 
A) a transform plate boundary 
B) a continental rift 
C) a divergent plate boundary 
D) an ocean-continent collision

Question 5

Explain why Wegner's use of shorelines to match continents in his reconstruction of Pangaea was criticized by other geoscientists and how that issue was subsequently resolved in Plate Tectonic Theory.

Accepted Answer

Wegner used the shorelines to match cont

Question 6

The greater the density,the steeper the angle of descent for the subducting slab.

Accepted Answer

A) True 
 B)False

Question 7

Hawaii is the oldest island of the Hawaiian Island chain.

Accepted Answer

A) True 
 B)False

Question 8

The main objection to Wegner's theory of Continental Drift was ________.

Accepted Answer

A) the ocean basins show no evidence of opening and closing. 
B) clear evidence of land bridges,like the one connecting Alaska and eastern Russia,clearly exist and explain most of Wegner's observations without Continental Drift. 
C) Wegner's gravitational mechanism for the movement of continents would also stop the Earth's rotation which has not happened. 
D) the tracks of the moving continents could not be identified on the ocean floor. 
A) the ocean basins show no evidence of opening and closing. 
B) clear evidence of land bridges,like the one connecting Alaska and eastern Russia,clearly exist and explain most of Wegner's observations without Continental Drift. 
C) Wegner's gravitational mechanism for the movement of continents would also stop the Earth's rotation which has not happened. 
D) the tracks of the moving continents could not be identified on the ocean floor.

Question 9

Which of the following is not evidence collected by the Glomar Challenger in support of the Plate Tectonic model?

Accepted Answer

A) Fossils increase in age with increasing distance from the ridges. 
B) Continental crust is typically several hundred million years old or older. 
C) Oceanic crust is less than 180 million years old. 
D) Sediments get thicker with increasing distance from the ridges. 
A) Fossils increase in age with increasing distance from the ridges. 
B) Continental crust is typically several hundred million years old or older. 
C) Oceanic crust is less than 180 million years old. 
D) Sediments get thicker with increasing distance from the ridges.

Question 10

________ was (were)never proposed as evidence supporting the existence of Pangaea.

Accepted Answer

A) Geometrical fit between South America and Africa 
B) Islands of Precambrian rocks along the Mid-Atlantic Ridge 
C) Late Paleozoic glacial features 
D) Similar fossils on different continents 
A) Geometrical fit between South America and Africa 
B) Islands of Precambrian rocks along the Mid-Atlantic Ridge 
C) Late Paleozoic glacial features 
D) Similar fossils on different continents

Question 11

Mount St.Helens and the other Cascade volcanoes are ________.

Accepted Answer

A) young,active stratovolcanoes built on a continental margin above a sinking slab of oceanic lithosphere 
B) a row of young,active,shield volcanoes built as western North America moved over a hot spot deep in the mantle 
C) old,deeply eroded stratovolcanoes built before the Pacific Ocean existed 
D) old,deeply eroded,basaltic shield volcanoes built when western North America was over the present-day site of the Hawaiian hot spot 
A) young,active stratovolcanoes built on a continental margin above a sinking slab of oceanic lithosphere 
B) a row of young,active,shield volcanoes built as western North America moved over a hot spot deep in the mantle 
C) old,deeply eroded stratovolcanoes built before the Pacific Ocean existed 
D) old,deeply eroded,basaltic shield volcanoes built when western North America was over the present-day site of the Hawaiian hot spot

Question 12

Which of the following plates is getting significantly smaller?

Accepted Answer

A) Pacific 
B) North America 
C) Africa 
D) Eurasia 
A) Pacific 
B) North America 
C) Africa 
D) Eurasia

Question 13

When two continents converge,________.

Accepted Answer

A) the heavier continent is subducted 
B) the lighter continent is subducted 
C) the sediments trapped between them are pushed up and deformed to make a mountain range 
D) a volcanic arc forms on the upper plate 
A) the heavier continent is subducted 
B) the lighter continent is subducted 
C) the sediments trapped between them are pushed up and deformed to make a mountain range 
D) a volcanic arc forms on the upper plate

Question 14

Briefly explain how deep trenches form.

Accepted Answer

Bending of the downgoing (subducting)oce

Question 15

Identify the letter in the figure below that corresponds to a fracture zone:

Accepted Answer

The answer of Identify the letter in the figure below...

Question 16

Most of the molten material that is generated above the subducting slab never reaches the surface to form a volcano.

Accepted Answer

A) True 
 B)False

Question 17

Oceanic Ridges are wider than most mountain belts.

Accepted Answer

A) True 
 B)False

Question 18

The major driving force of Plate Tectonics is ________.

Accepted Answer

A) subduction of cold,dense lithosphere 
B) subduction of hot lithosphere 
C) decompression melting and the rise of magmas at spreading ridges 
D) heating of magma near the surface of the lithosphere 
A) subduction of cold,dense lithosphere 
B) subduction of hot lithosphere 
C) decompression melting and the rise of magmas at spreading ridges 
D) heating of magma near the surface of the lithosphere

Question 19

All of the following are evidence supporting the theory of plate tectonics except for ________.

Accepted Answer

A) changes in the Moon's orbit due to shifting plates 
B) ocean floor drilling 
C) hot spots 
D) paleomagnetism 
A) changes in the Moon's orbit due to shifting plates 
B) ocean floor drilling 
C) hot spots 
D) paleomagnetism

Question 20

What is a typical rate for seafloor spreading?

Accepted Answer

A) 2 cm/s 
B) 2 cm/hr 
C) 2 cm/day 
D) 2 cm/yr 
A) 2 cm/s 
B) 2 cm/hr 
C) 2 cm/day 
D) 2 cm/yr

Exam 7: Plate Tectonics: a Scientific Revolution Unfolds

Which ocean formed as a direct result of the breakup of Pangaea?

The change from thinking the continents are stationary to understanding that the outer layer of the earth moves slowly nearly all of the time occurred primarily because ________.

The oldest rocks of the oceanic crust are found in deep ocean trenches far away from active,mid-ocean ridges.

The San Andreas fault zone in California is an example of ________.

Explain why Wegner's use of shorelines to match continents in his reconstruction of Pangaea was criticized by other geoscientists and how that issue was subsequently resolved in Plate Tectonic Theory.

The greater the density,the steeper the angle of descent for the subducting slab.

Hawaii is the oldest island of the Hawaiian Island chain.

The main objection to Wegner's theory of Continental Drift was ________.

Which of the following is not evidence collected by the Glomar Challenger in support of the Plate Tectonic model?

________ was (were)never proposed as evidence supporting the existence of Pangaea.

Mount St.Helens and the other Cascade volcanoes are ________.

Which of the following plates is getting significantly smaller?

When two continents converge,________.

Briefly explain how deep trenches form.

Identify the letter in the figure below that corresponds to a fracture zone:

Most of the molten material that is generated above the subducting slab never reaches the surface to form a volcano.

Oceanic Ridges are wider than most mountain belts.

The major driving force of Plate Tectonics is ________.

All of the following are evidence supporting the theory of plate tectonics except for ________.

What is a typical rate for seafloor spreading?

Introduction to Earth Science

Matter and Minerals

Rocks: Materials of the Solid Earth

Weathering, soil, and Mass Wasting

Running Water and Groundwater

Glaciers, deserts, and Wind

Earthquakes and Earths Interior

Volcanoes and Other Igneous Activity

Crustal Deformation and Mountain Building

Geologic Time

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

World Climates and Global Climate Change

Origin of Modern Astronomy

Touring Our Solar System

Light,astronomical Observations,and the Sun

Beyond Our Solar System

Filters

Identify the letter in the figure below that corresponds to a fracture zone: $Identify the letter in the figure below that corresponds to a fracture zone:$