Question 1

Subducted slabs completely melt in the mantle and mix with the surrounding mantle.

Accepted Answer

A) True 
 B)False

Question 2

Hot spots have active volcanoes above them on the Earth's surface and moving plates carry the volcanoes away from their hot-spot source.

Accepted Answer

A) True 
 B)False

Question 3

The grand recycling of the upper few hundred kilometers of the Earth is called the tectonic cycle.

Accepted Answer

A) True 
 B)False

Question 4

When oceanic lithosphere collides with another plate,the ________ in the process of subduction.

Accepted Answer

A)  older,colder plate goes beneath the younger,warmer plate
B)  younger,warmer plate goes beneath the older,colder plate
C)  plates both disappear downward
D)  plates pile up,forming mid-ocean ridgesE) A) and B)
F) All of the above

Question 5

Gravitational pull on a dense,down-going plate at a subduction zone (slab pull)is one of the forces that keeps the lithospheric plates moving.

Accepted Answer

A) True 
 B)False

Question 6

Above the oceanic ridges,the ocean water depths are relatively deep in comparison to depths away from the ridges.

Accepted Answer

A) True 
 B)False

Question 7

The gigantic pieces of lithospheric plates diverging,sliding past,or colliding with each other are directly responsible for the vast majority of the earthquakes,volcanic eruptions,and mountains on Earth.

Accepted Answer

A) True 
 B)False

Question 8

After lava cools below the ______ point,about 550 ∘\circ∘ C,atoms in iron-bearing minerals become magnetized in the direction of the Earth's magnetic field at that time and place.

Accepted Answer

A)  magnetization
B)  critical
C)  triple
D)  Curie
E)  solidus F) B) and C)
G) A) and E)

Question 9

The most famous and outspoken of the early proponents of continental drift was ______________.

Accepted Answer

A)  Plato,for whom "plate tectonics" was named
B)  Leonardo da Vinci
C)  William Smith
D)  Alfred Wegener
E)  Immanuel KantF) A) and D)
G) A) and C)

Question 10

The blanket of sediment on the sea floor is ___________ toward the ocean margins.

Accepted Answer

A)  very thin at the volcanic ridges and thickens
B)  very thick at the volcanic ridges and thins
C)  thick at the volcanic ridges and thickens more
D)  very thin at the volcanic ridges and is missingE) C) and D)
F) None of the above

Question 11

The Pacific plate subducts along _________ edges and creates enormous earthquakes,such as the 1923 Tokyo seism.

Accepted Answer

A)  its southern and eastern
B)  its northern and eastern
C)  its southern and western
D)  its northern and western
E)  all of itsF) C) and D)
G) All of the above

Question 12

If sea-floor spreading occurs at a constant rate,the widths of magnetized seafloor strips have _____ ratios as the lengths of time between successive reversals of the Earth's magnetic field.

Accepted Answer

A)  opposite
B)  critical
C)  triple
D)  two to one
E)  the sameF) None of the above
G) A) and E)

Question 13

Which of the following is NOT a basic tenet of plate tectonics?

Accepted Answer

A)  Melted asthenosphere flows upward as magma and cools to form new ocean floor lithosphere.
B)  The new lithosphere slowly moves laterally away from the zones of oceanic crust formation on top of the underlying asthenosphere (seafloor spreading) .
C)  When the leading edge of a moving slab of oceanic lithosphere collides with another slab,the older,colder,denser slab turns downward and is pulled by gravity back into the asthenosphere (subduction) ,while the less-dense,more buoyant slab overrides it.
D)  The slab pulled into the asthenosphere begins the process of melting and moves into the liquid core.
E)  The slab pulled into the asthenosphere begins the process of reabsorption into the mantle.F) C) and E)
G) A) and B)

Question 14

All of the continents were once combined into a single supercontinent called ________________.

Accepted Answer

A)  Laurasia
B)  Gondwanaland
C)  Tethys
D)  Panthalassa
E)  PangaeaF) C) and D)
G) A) and B)

Question 15

In 1620,Francis Bacon of England noted the parallelism of the Atlantic coastlines of South America and Africa and suggested that these continents had once been joined.

Accepted Answer

A) True 
 B)False

Question 16

Moving progressively away from the ridges,the ocean water depths increase systematically with seafloor age due to all but which of the following?

Accepted Answer

A)  cooling and contraction of the oceanic crust with a resultant increase in density
B)  isostatic down warping due to the weight of sediments deposited on the sea floor
C)  erosion of the older ocean floor by deep ocean currents
D)  conduction of heat away from the molten surface rocksE) B) and D)
F) A) and C)

Exam 2: Internal Energy and Plate Tectonics

The grand recycling of the upper few hundred kilometers of the Earth is called the tectonic cycle.

Correct Answer
verified

When oceanic lithosphere collides with another plate,the ________ in the process of subduction.

Correct Answer
verified

The gigantic pieces of lithospheric plates diverging,sliding past,or colliding with each other are directly responsible for the vast majority of the earthquakes,volcanic eruptions,and mountains on Earth.

Correct Answer
verified

Moving progressively away from the ridges,the ocean water depths increase systematically with seafloor age due to all but which of the following?

Correct Answer
verified

Which of the following is NOT a basic tenet of plate tectonics?

Correct Answer
verified

If sea-floor spreading occurs at a constant rate,the widths of magnetized seafloor strips have _____ ratios as the lengths of time between successive reversals of the Earth's magnetic field.

Correct Answer
verified

Gravitational pull on a dense,down-going plate at a subduction zone (slab pull)is one of the forces that keeps the lithospheric plates moving.

Correct Answer
verified

The most famous and outspoken of the early proponents of continental drift was ______________.

Correct Answer
verified

In 1620,Francis Bacon of England noted the parallelism of the Atlantic coastlines of South America and Africa and suggested that these continents had once been joined.

Correct Answer
verified

Hot spots have active volcanoes above them on the Earth's surface and moving plates carry the volcanoes away from their hot-spot source.

Correct Answer
verified

All of the continents were once combined into a single supercontinent called ________________.

Correct Answer
verified

After lava cools below the ______ point,about 550^$\circ$C,atoms in iron-bearing minerals become magnetized in the direction of the Earth's magnetic field at that time and place.

Correct Answer
verified

Above the oceanic ridges,the ocean water depths are relatively deep in comparison to depths away from the ridges.

Correct Answer
verified

The blanket of sediment on the sea floor is ___________ toward the ocean margins.

Correct Answer
verified

Subducted slabs completely melt in the mantle and mix with the surrounding mantle.

Correct Answer
verified

The Pacific plate subducts along _________ edges and creates enormous earthquakes,such as the 1923 Tokyo seism.

Correct Answer
verified

Exam 2: Internal Energy and Plate Tectonics

The grand recycling of the upper few hundred kilometers of the Earth is called the tectonic cycle.

Correct AnswerverifiedShow Answer

When oceanic lithosphere collides with another plate,the ________ in the process of subduction.

Correct AnswerverifiedShow Answer

The gigantic pieces of lithospheric plates diverging,sliding past,or colliding with each other are directly responsible for the vast majority of the earthquakes,volcanic eruptions,and mountains on Earth.

Correct AnswerverifiedShow Answer

Moving progressively away from the ridges,the ocean water depths increase systematically with seafloor age due to all but which of the following?

Correct AnswerverifiedShow Answer

Which of the following is NOT a basic tenet of plate tectonics?

Correct AnswerverifiedShow Answer

If sea-floor spreading occurs at a constant rate,the widths of magnetized seafloor strips have _____ ratios as the lengths of time between successive reversals of the Earth's magnetic field.

Correct AnswerverifiedShow Answer

Gravitational pull on a dense,down-going plate at a subduction zone (slab pull)is one of the forces that keeps the lithospheric plates moving.

Correct AnswerverifiedShow Answer

The most famous and outspoken of the early proponents of continental drift was ______________.

Correct AnswerverifiedShow Answer

In 1620,Francis Bacon of England noted the parallelism of the Atlantic coastlines of South America and Africa and suggested that these continents had once been joined.

Correct AnswerverifiedShow Answer

Hot spots have active volcanoes above them on the Earth's surface and moving plates carry the volcanoes away from their hot-spot source.

Correct AnswerverifiedShow Answer

All of the continents were once combined into a single supercontinent called ________________.

Correct AnswerverifiedShow Answer

After lava cools below the ______ point,about 550 ∘\circ∘ C,atoms in iron-bearing minerals become magnetized in the direction of the Earth's magnetic field at that time and place.

Correct AnswerverifiedShow Answer

Above the oceanic ridges,the ocean water depths are relatively deep in comparison to depths away from the ridges.

Correct AnswerverifiedShow Answer

The blanket of sediment on the sea floor is ___________ toward the ocean margins.

Correct AnswerverifiedShow Answer

Subducted slabs completely melt in the mantle and mix with the surrounding mantle.

Correct AnswerverifiedShow Answer

The Pacific plate subducts along _________ edges and creates enormous earthquakes,such as the 1923 Tokyo seism.

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

After lava cools below the ______ point,about 550^$\circ$C,atoms in iron-bearing minerals become magnetized in the direction of the Earth's magnetic field at that time and place.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified