Plate Tectonics

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Plate Tectonics
Chapter 7
Preview
CRCT Preparation
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CRCT Preparation
Chapter 7
1. How do mid-ocean ridges support both the idea
of continental drift and the theory of plate
tectonics? A Oceanic lithosphere is destroyed at
mid-ocean ridges. B New crust forms at mid-ocean
ridges. C Tectonic plates collide at mid-ocean
ridges. D The crust at mid-ocean ridges is old
oceanic lithosphere.
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CRCT Preparation
Chapter 7
1. How do mid-ocean ridges support both the idea
of continental drift and the theory of plate
tectonics? A Oceanic lithosphere is destroyed at
mid-ocean ridges. B New crust forms at mid-ocean
ridges. C Tectonic plates collide at mid-ocean
ridges. D The crust at mid-ocean ridges is old
oceanic lithosphere.
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CRCT Preparation
Chapter 7
2. Which of the following compositional layers
makes up the greatest percentage of Earths
mass? A continental crust B oceanic crust C the
mantle D the core
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CRCT Preparation
Chapter 7
2. Which of the following compositional layers
makes up the greatest percentage of Earths
mass? A continental crust B oceanic crust C the
mantle D the core
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CRCT Preparation
Chapter 7
3. How does fossil evidence support Wegeners
hypothesis of continental drift? A Similar
fossils found on far apart landmasses suggest
that the continents were once a single
landmass. B Fossil evidence suggests that the
continents have always been in their current
positions. C No similarities exist between
fossils on different continents. D Plant and
animal fossils show evidence of changes in
Earths polarity.
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CRCT Preparation
Chapter 7
3. How does fossil evidence support Wegeners
hypothesis of continental drift? A Similar
fossils found on far apart landmasses suggest
that the continents were once a single
landmass. B Fossil evidence suggests that the
continents have always been in their current
positions. C No similarities exist between
fossils on different continents. D Plant and
animal fossils show evidence of changes in
Earths polarity.
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CRCT Preparation
Chapter 7
4. Most of the worlds folded mountains formed as
a result of A oceanic-oceanic separation at
mid-ocean ridges. B continental-continental
separation at rift zones. C continental-oceanic
collision at subduction zones. D
continental-continental collision at convergent
boundaries.
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CRCT Preparation
Chapter 7
4. Most of the worlds folded mountains formed as
a result of A oceanic-oceanic separation at
mid-ocean ridges. B continental-continental
separation at rift zones. C continental-oceanic
collision at subduction zones. D
continental-continental collision at convergent
boundaries.
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CRCT Preparation
Chapter 7
5. Which of the following geologic features forms
as a result of tension? A an anticline B a
syncline C a normal fault D a reverse fault
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CRCT Preparation
Chapter 7
5. Which of the following geologic features forms
as a result of tension? A an anticline B a
syncline C a normal fault D a reverse fault
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CRCT Preparation
Chapter 7
6. Scientists think that all of the present-day
continents were once joined in a single
supercontinent called A Pangaea. B Panthalassa. C
Laurasia. D Gondwana.
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CRCT Preparation
Chapter 7
6. Scientists think that all of the present-day
continents were once joined in a single
supercontinent called A Pangaea. B Panthalassa. C
Laurasia. D Gondwana.
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CRCT Preparation
Chapter 7
Use the diagram to answer question 7.
7. Which of the following structures is shown in
the diagram if the bottom layer is the oldest? A
a monocline C an anticline B a fault D a
syncline
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CRCT Preparation
Chapter 7
Use the diagram to answer question 7.
7. Which of the following structures is shown in
the diagram if the bottom layer is the oldest? A
a monocline C an anticline B a fault D a
syncline
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CRCT Preparation
Chapter 7
8. The sinking of Earths crust to lower
elevations is called A rebound. B subsidence. C
uplift. D deformation.
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CRCT Preparation
Chapter 7
8. The sinking of Earths crust to lower
elevations is called A rebound. B subsidence. C
uplift. D deformation.
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CRCT Preparation
Chapter 7
9. Sea-floor spreading occurs at which of the
following types of tectonic plate boundaries? A
transform B convergent C divergent D strike-slip
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CRCT Preparation
Chapter 7
9. Sea-floor spreading occurs at which of the
following types of tectonic plate boundaries? A
transform B convergent C divergent D strike-slip
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CRCT Preparation
Chapter 7
Use the table to answer question 10.
10. According to the table, which of the
following statements is true?
A Oceanic crust is Earths thinnest and least
dense compositional layer. B Continental crust is
Earths thinnest and densest compositional
layer. C The mantle is Earths thickest and
densest compositional layer. D The core is
Earths thickest and densest compositional layer.
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CRCT Preparation
Chapter 7
Use the table to answer question 10.
10. According to the table, which of the
following statements is true?
A Oceanic crust is Earths thinnest and least
dense compositional layer. B Continental crust is
Earths thinnest and densest compositional
layer. C The mantle is Earths thickest and
densest compositional layer. D The core is
Earths thickest and densest compositional layer.
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CRCT Preparation
Chapter 7
11. The Appalachian Mountains and the Himalaya
Mountains were both formed by folding. The
Himalayas are still growing taller. The
Appalachian Mountains are losing height and
becoming more rounded. Why are these mountains
changing in different ways?
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CRCT Preparation
Chapter 7

• 11. Answer - Full-credit answers should include
  the following points
• The Himalayas are still growing because they are
  at a convergent boundary that is still active.
• The Appalachian Mountains are no longer at an
  active convergent boundary, so their rock layers
  are no longer being pushed upward.
• The Appalachian Mountains are being worn down by
  weathering and erosion.

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CRCT Preparation
Chapter 7
12. The Cartersville fault formed when
metamorphic rocks from Georgias Piedmont region
were pushed over sedimentary rock layers in the
Valley and Ridge region to the west. What kind
of fault is the Cartersville fault? Explain your
answer.
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CRCT Preparation
Chapter 7

• 12. Answer - Full-credit answers should include
  the following points
• The Cartersville fault is a reverse fault.
• The two types of rock were pushed together,
  causing the metamorphic rock to slide up and over
  the sedimentary rock.