Question 1

What was the driving mechanism proposed by Hess to explain sea floor spreading?

Accepted Answer

A)  downwelling oceanic currents 
B)  hydrothermal cells 
C)  thermal convection cells 
D)  motions in the outer core 
E)  thermal convection cells AND motions in the outer core 
A)  downwelling oceanic currents 
B)  hydrothermal cells 
C)  thermal convection cells 
D)  motions in the outer core 
E)  thermal convection cells AND motions in the outer core

Question 2

At a mid-ocean ridge spreading center,what happens?

Accepted Answer

A)  the plates are moving past each other 
B)  the plates are moving away from each other 
C)  the plates are moving toward each other 
D)  one plate is being subducted beneath another 
E)  both plates are being subducted 
A)  the plates are moving past each other 
B)  the plates are moving away from each other 
C)  the plates are moving toward each other 
D)  one plate is being subducted beneath another 
E)  both plates are being subducted

Question 3

To determine the rate of plate motion,geologists date the magnetic anomalies on the seafloor and determine the distance from the ridge axis to that magnetic anomaly.Then they divide the age by the distance to determine the rate of movement.

Accepted Answer

A) True 
 B)False

Question 4

Lithospheric plates move on the Earth's surface because ____.

Accepted Answer

A)  warm mantle ascends at ridges and cool mantle descends at subduction zones 
B)  convection occurs only in the asthenosphere 
C)  cool mantle ascends at ridges and warm mantle descends at subduction zones 
D)  warm mantle ascends at ridges and cool mantle descends at subduction zones AND convection occurs only in the asthenosphere 
E)  convection occurs only in the asthenosphere AND cool mantle ascends at ridges and warm mantle descends at subduction zones 
A)  warm mantle ascends at ridges and cool mantle descends at subduction zones 
B)  convection occurs only in the asthenosphere 
C)  cool mantle ascends at ridges and warm mantle descends at subduction zones 
D)  warm mantle ascends at ridges and cool mantle descends at subduction zones AND convection occurs only in the asthenosphere 
E)  convection occurs only in the asthenosphere AND cool mantle ascends at ridges and warm mantle descends at subduction zones

Question 5

The type of plate boundary at which many of the world's major metallic ore deposits are associated is ____________________.

Accepted Answer

The answer of The type of plate boundary at which...

Question 6

Old,cold,and dense oceanic crust is ____.

Accepted Answer

A)  created at spreading ridges 
B)  found closest to continental margins 
C)  destroyed at subduction zones 
D)  eventually becomes incorporated into continental crust 
E)  always found on plate margins 
A)  created at spreading ridges 
B)  found closest to continental margins 
C)  destroyed at subduction zones 
D)  eventually becomes incorporated into continental crust 
E)  always found on plate margins

Question 7

Many seemingly unrelated geologic features and events are interrelated by plate tectonics processes.

Accepted Answer

A) True 
 B)False

Question 8

Plate tectonic processes have influenced which of the following?

Accepted Answer

A)  the distribution of earthquakes and volcanoes 
B)  the locations of ore deposits and mountain systems 
C)  climatic patterns and ocean circulation 
D)  the geographic distribution, evolution, and extinction of life forms 
E)  all of these 
A)  the distribution of earthquakes and volcanoes 
B)  the locations of ore deposits and mountain systems 
C)  climatic patterns and ocean circulation 
D)  the geographic distribution, evolution, and extinction of life forms 
E)  all of these

Question 9

If the continents were once joined together,rocks and mountain ranges on the margins of each should have ____.

Accepted Answer

A)  formed under the same conditions 
B)  formed the same sequences 
C)  formed at the same time 
D)  the same structural trends and forces 
E)  all of these 
A)  formed under the same conditions 
B)  formed the same sequences 
C)  formed at the same time 
D)  the same structural trends and forces 
E)  all of these

Question 10

At transform plate boundaries,____.

Accepted Answer

A)  lithosphere is neither created or destroyed 
B)  plates move laterally past each other 
C)  active volcanism occurs 
D)  plates move laterally past each other AND active volcanism occurs 
E)  all of these 
A)  lithosphere is neither created or destroyed 
B)  plates move laterally past each other 
C)  active volcanism occurs 
D)  plates move laterally past each other AND active volcanism occurs 
E)  all of these

Question 11

Volcanoes are found at these two types of plate boundaries: ____________________ and ____________________.

Accepted Answer

divergent,

Question 12

During the Triassic,a number of rift related fault basins formed along the eastern margin of North America.

Accepted Answer

A) True 
 B)False

Question 13

When a continental plate diverges from another continental plate what happens?

Accepted Answer

A)  a new ocean basin forms 
B)  a large mountain range forms 
C)  a transform fault forms 
D)  there are no earthquakes 
E)  a subduction zone forms 
A)  a new ocean basin forms 
B)  a large mountain range forms 
C)  a transform fault forms 
D)  there are no earthquakes 
E)  a subduction zone forms

Question 14

A transform plate boundary underlies the Alps in southern Europe.

Accepted Answer

A) True 
 B)False

Question 15

The fact that no oceanic crust older than 180 million years (Jurassic)has been found indicates what?

Accepted Answer

A)  The break-up of Pangaea must have occurred before the Jurassic Period. 
B)  The ocean basins must be older than Jurassic age. 
C)  The movement of continents must have begun no earlier than the Jurassic Period. 
D)  The break-up of Pangaea must have begun at about the same time as these oldest basalts were formed. 
E)  The movement of continents must have begun no earlier than the Jurassic Period AND The break-up of Pangaea must have begun at about the same time as these oldest basalts were formed. 
A)  The break-up of Pangaea must have occurred before the Jurassic Period. 
B)  The ocean basins must be older than Jurassic age. 
C)  The movement of continents must have begun no earlier than the Jurassic Period. 
D)  The break-up of Pangaea must have begun at about the same time as these oldest basalts were formed. 
E)  The movement of continents must have begun no earlier than the Jurassic Period AND The break-up of Pangaea must have begun at about the same time as these oldest basalts were formed.

Question 16

How does the introduction of a geographic barrier encourage the evolution of species?

Accepted Answer

A population that is not separated will

Question 17

Explain how mountain ranges can be used as evidence to support continental drift.

Accepted Answer

A mountain range forms under the same ge

Question 18

Describe how the two models for the driving force of plate motion are the same.How are they different?

Accepted Answer

Both models involve thermal convection i

Question 19

The seafloor spreading hypothesis indicates what as the primary cause of continental movement?

Accepted Answer

A)  volcanism in the ocean crust 
B)  convergence of tectonic plates 
C)  the formation and destruction of ocean basins 
D)  the convection of mantle heat 
E)  the decay of radioactive isotopes 
A)  volcanism in the ocean crust 
B)  convergence of tectonic plates 
C)  the formation and destruction of ocean basins 
D)  the convection of mantle heat 
E)  the decay of radioactive isotopes

Question 20

What are the heat sources for each of the two mantle convection models for plate tectonics?

Accepted Answer

With whole mantle convection,t

Exam 2: Plate Tectonics: A Unifying Theory

What was the driving mechanism proposed by Hess to explain sea floor spreading?

At a mid-ocean ridge spreading center,what happens?

To determine the rate of plate motion,geologists date the magnetic anomalies on the seafloor and determine the distance from the ridge axis to that magnetic anomaly.Then they divide the age by the distance to determine the rate of movement.

Lithospheric plates move on the Earth's surface because ____.

The type of plate boundary at which many of the world's major metallic ore deposits are associated is ____________________.

Old,cold,and dense oceanic crust is ____.

Many seemingly unrelated geologic features and events are interrelated by plate tectonics processes.

Plate tectonic processes have influenced which of the following?

If the continents were once joined together,rocks and mountain ranges on the margins of each should have ____.

At transform plate boundaries,____.

Volcanoes are found at these two types of plate boundaries: ____________________ and ____________________.

During the Triassic,a number of rift related fault basins formed along the eastern margin of North America.

When a continental plate diverges from another continental plate what happens?

A transform plate boundary underlies the Alps in southern Europe.

The fact that no oceanic crust older than 180 million years (Jurassic)has been found indicates what?

How does the introduction of a geographic barrier encourage the evolution of species?

Explain how mountain ranges can be used as evidence to support continental drift.

Describe how the two models for the driving force of plate motion are the same.How are they different?

The seafloor spreading hypothesis indicates what as the primary cause of continental movement?

What are the heat sources for each of the two mantle convection models for plate tectonics?

Understanding Earth: A Dynamic and Evolving Planet

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

Precambrian Earth and Life History

Paleozoic Earth History

Paleozoic Life History

Mesozoic Earth and Life History

Cenozoic Earth and Life History

Geology in Perspective

Filters

Volcanoes are found at these two types of plate boundaries: and .