Question 1

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

Accepted Answer

A) True 
 B)False

Question 2

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. 
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.

Question 3

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

Question 4

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 5

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 ridges 
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 ridges

Question 6

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 7

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

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 
A) magnetization 
B) critical 
C) triple 
D) Curie 
E) solidus

Question 9

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 10

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 its 
A) its southern and eastern 
B) its northern and eastern 
C) its southern and western 
D) its northern and western 
E) all of its

Question 11

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 same 
A) opposite 
B) critical 
C) triple 
D) two to one 
E) the same

Question 12

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 missing 
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 missing

Question 13

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 14

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 15

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 rocks 
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 rocks

Question 16

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

Accepted Answer

A) Laurasia 
B) Gondwanaland 
C) Tethys 
D) Panthalassa 
E) Pangaea 
A) Laurasia 
B) Gondwanaland 
C) Tethys 
D) Panthalassa 
E) Pangaea

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

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

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

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.

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

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.

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

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.

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

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

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.

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

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.

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

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

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

Natural Disasters and the Human Population

Earthquake Geology and Seismology

Plate Tectonics and Earthquakes

Earthquakes Throughout the United States and Canada

Volcanic Eruptions: Plate Tectonics and Magmas

Volcano Processes and Deadly Events

Tsunami Versus Wind-Caused Waves

External Energy Fuels Weather and Climate

Tornadoes, Lightning, Heat, and Cold

Hurricanes

Climate Change

Floods

Fire

Mass Movements

Coastal Processes and Hazards

Impacts With Space Objects

Filters

Exam 2: Internal Energy and Plate Tectonics

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

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

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

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.

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

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.

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

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.

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

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

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.

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

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.

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

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

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

Natural Disasters and the Human Population

Earthquake Geology and Seismology

Plate Tectonics and Earthquakes

Earthquakes Throughout the United States and Canada

Volcanic Eruptions: Plate Tectonics and Magmas

Volcano Processes and Deadly Events

Tsunami Versus Wind-Caused Waves

External Energy Fuels Weather and Climate

Tornadoes, Lightning, Heat, and Cold

Hurricanes

Climate Change

Floods

Fire

Mass Movements

Coastal Processes and Hazards

Impacts With Space Objects

Filters

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.