Question 1

When did the continents acquire outlines similar to the ones they have now?

Accepted Answer

A)  Cenozoic Era 
B)  Paleozoic Era 
C)  Mesozoic Era 
D)  Devonian Period 
A)  Cenozoic Era 
B)  Paleozoic Era 
C)  Mesozoic Era 
D)  Devonian Period

Question 2

How many hot spots are there on Earth?

Accepted Answer

A)  4 
B)  40 
C)  400 
D)  4000 
A)  4 
B)  40 
C)  400 
D)  4000

Question 3

What is a typical depth of a deep-sea trench?

Accepted Answer

A)  5 m 
B)  5 km 
C)  50 m 
D)  50 km 
A)  5 m 
B)  5 km 
C)  50 m 
D)  50 km

Question 4

The landmass that is now the eastern United States used to face

Accepted Answer

A)  southwest. 
B)  north. 
C)  northeast. 
D)  south. 
A)  southwest. 
B)  north. 
C)  northeast. 
D)  south.

Question 5

"What is the evidence that plates slide past one another at transform plate boundaries?"

Accepted Answer

"Transform plate boundaries are a specia

Question 6

Why are so few volcanoes mapped in the middle of the oceans?

Accepted Answer

A)  The middle of the oceans corresponds with the middle of tectonic plates, so there are only hot-spot volcanoes there. 
B)  Geologists cannot pinpoint the locations of many recently active seafloor volcanoes. 
C)  There are only convergent plate boundaries under the ocean, which are less likely to have volcanoes than transform or divergent boundaries. 
D)  There are only divergent plate boundaries under the ocean, which are less likely to have volcanoes than transform or convergent boundaries. 
A)  The middle of the oceans corresponds with the middle of tectonic plates, so there are only hot-spot volcanoes there. 
B)  Geologists cannot pinpoint the locations of many recently active seafloor volcanoes. 
C)  There are only convergent plate boundaries under the ocean, which are less likely to have volcanoes than transform or divergent boundaries. 
D)  There are only divergent plate boundaries under the ocean, which are less likely to have volcanoes than transform or convergent boundaries.

Question 7

What observation supports the hypothesis that the slab-pull force is the primary cause of plate motion?

Accepted Answer

A)  Divergent plate boundaries represent all of the upwelling expected by mantle convection. 
B)  Plumes are the deep upwelling component of convection with seismically slow velocities. 
C)  Earthquakes and volcanoes are concentrated at plate boundaries. 
D)  Plates with long subduction zones move faster than plates with short subduction-zones. 
A)  Divergent plate boundaries represent all of the upwelling expected by mantle convection. 
B)  Plumes are the deep upwelling component of convection with seismically slow velocities. 
C)  Earthquakes and volcanoes are concentrated at plate boundaries. 
D)  Plates with long subduction zones move faster than plates with short subduction-zones.

Question 8

Judge the following sentence according to the criteria given below. Seafloor elevations decrease away from mid-ocean ridges because cooling lithosphere contracts, becomes denser and sinks down into the weak asthenosphere.

Accepted Answer

A)  The assertion is correct but the reason is incorrect. 
B)  The assertion is incorrect but the reason is correct. 
C)  The assertion and the reason are both correct, and the reason is valid. 
D)  The assertion and the reason are both correct, but the reason is invalid. 
E)  Both the assertion and the reason are incorrect. 
A)  The assertion is correct but the reason is incorrect. 
B)  The assertion is incorrect but the reason is correct. 
C)  The assertion and the reason are both correct, and the reason is valid. 
D)  The assertion and the reason are both correct, but the reason is invalid. 
E)  Both the assertion and the reason are incorrect.

Question 9

How do convergent and divergent boundaries differ?"

Accepted Answer

Convergent plate boundaries strongly con

Question 10

Figure 12.43  
-According to Figure 12.43 when did the Appalachian Mountains form?

Accepted Answer

A)  540 million years ago 
B)  430 million years ago 
C)  300 million years ago 
D)  170 million years ago 
E)  90 million years ago 
A)  540 million years ago 
B)  430 million years ago 
C)  300 million years ago 
D)  170 million years ago 
E)  90 million years ago

Question 11

Which of the following is not a normal consequence of the convergence of two continental crust plates?

Accepted Answer

A)  subduction of the thicker plate 
B)  formation of thrust faults 
C)  increasing thickness of crust 
D)  formation of mountains 
A)  subduction of the thicker plate 
B)  formation of thrust faults 
C)  increasing thickness of crust 
D)  formation of mountains

Question 12

Which Hawaiian island is the youngest?

Accepted Answer

A)  Hawaii 
B)  Kahoolawe 
C)  Oahu 
D)  Kauai 
A)  Hawaii 
B)  Kahoolawe 
C)  Oahu 
D)  Kauai

Question 13

Most active mountain belts are located near plate boundaries.

Accepted Answer

A) True 
 B)False

Question 14

The Wadati-Benioff zone outlines the ________ at a convergent boundary.

Accepted Answer

A)  ocean trench 
B)  ocean ridge 
C)  subducting plate 
D)  transform fault 
A)  ocean trench 
B)  ocean ridge 
C)  subducting plate 
D)  transform fault

Question 15

Which type of convergent plate boundary raised the Tibetan Plateau?

Accepted Answer

A)  oceanic-oceanic 
B)  continental-continental 
C)  continental-oceanic 
D)  ridge-hot spot 
A)  oceanic-oceanic 
B)  continental-continental 
C)  continental-oceanic 
D)  ridge-hot spot

Question 16

What is true of Iceland?

Accepted Answer

A)  Iceland is contracting at a rate of about 4 mm per year due to melting at the Mid-Atlantic Ridge. 
B)  Iceland is stretching at a rate of about 4 mm per year due to expansion at the Mid-Atlantic Ridge. 
C)  Iceland is contracting at a rate of about 4 m per year due to melting at the Mid-Atlantic Ridge. 
D)  Iceland is stretching at a rate of about 4 m per year due to expansion at the Mid-Atlantic Ridge. 
A)  Iceland is contracting at a rate of about 4 mm per year due to melting at the Mid-Atlantic Ridge. 
B)  Iceland is stretching at a rate of about 4 mm per year due to expansion at the Mid-Atlantic Ridge. 
C)  Iceland is contracting at a rate of about 4 m per year due to melting at the Mid-Atlantic Ridge. 
D)  Iceland is stretching at a rate of about 4 m per year due to expansion at the Mid-Atlantic Ridge.

Question 17

How do we track the earth's magnetic field back through time?

Accepted Answer

by using magnetic mi

Question 18

What is the primary force that drives plate motion?

Accepted Answer

A)  slab pull 
B)  gravity 
C)  superplume push 
D)  mid-ocean ridge igneous push 
A)  slab pull 
B)  gravity 
C)  superplume push 
D)  mid-ocean ridge igneous push

Question 19

A tectonically quiet zone results when

Accepted Answer

A)  crust materials are soft. 
B)  the lithosphere is not too dense. 
C)  there are many small faults. 
D)  plates move in the same direction at the same velocity. 
A)  crust materials are soft. 
B)  the lithosphere is not too dense. 
C)  there are many small faults. 
D)  plates move in the same direction at the same velocity.

Question 20

What do mountain belts such as the Caledonian and Appalachian Mountains suggest to scientists?

Accepted Answer

A)  By uniformitarian principles, the tectonic plates may have been in different positions in the past. 
B)  The theory of tectonic plate action is not sufficient to explain all mountain building. 
C)  The continental lithosphere is more rigid than the oceanic lithosphere. 
D)  By evaluation of the deformations, the asthenosphere is more rigid than the lithosphere. 
A)  By uniformitarian principles, the tectonic plates may have been in different positions in the past. 
B)  The theory of tectonic plate action is not sufficient to explain all mountain building. 
C)  The continental lithosphere is more rigid than the oceanic lithosphere. 
D)  By evaluation of the deformations, the asthenosphere is more rigid than the lithosphere.

Exam 12: Global Tectonics: Plates and Plumes

When did the continents acquire outlines similar to the ones they have now?

How many hot spots are there on Earth?

What is a typical depth of a deep-sea trench?

The landmass that is now the eastern United States used to face

"What is the evidence that plates slide past one another at transform plate boundaries?"

Why are so few volcanoes mapped in the middle of the oceans?

What observation supports the hypothesis that the slab-pull force is the primary cause of plate motion?

Judge the following sentence according to the criteria given below. Seafloor elevations decrease away from mid-ocean ridges because cooling lithosphere contracts, becomes denser and sinks down into the weak asthenosphere.

How do convergent and divergent boundaries differ?"

Figure 12.43 -According to Figure 12.43 when did the Appalachian Mountains form?

Which of the following is not a normal consequence of the convergence of two continental crust plates?

Which Hawaiian island is the youngest?

Most active mountain belts are located near plate boundaries.

The Wadati-Benioff zone outlines the ________ at a convergent boundary.

Which type of convergent plate boundary raised the Tibetan Plateau?

What is true of Iceland?

How do we track the earth's magnetic field back through time?

What is the primary force that drives plate motion?

A tectonically quiet zone results when

What do mountain belts such as the Caledonian and Appalachian Mountains suggest to scientists?

Why Study Earth

Minerals: Building Blocks of the Planet

Rocks and Rock-Forming Processes

Formation of Magma and Igneous Rocks

Formation of Sediment and Sedimentary Rocks

Formation of Metamorphic Rocks

Earth Materials As Time Keepers

Earth Materials As Time Keepers

Making Earth

Motion Inside Earth

Deformation of Rocks

Tectonics and Surface Relief

Soil Formation and Landscape Stability

Mass Movements: Landscapes in Motion

Streams: Flowing Water Shapes the Landscape

Water Flowing Underground

Glaciers: Cold-Climate Sculptors of Continents

Shorelines: Changing Landscapes Where Land Meets Sea

Wind: a Global Geologic Process

Global Warming: Real Time Change in the Earth System

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