Transcript ch07_crct plate tectonics

Chapter 7
Plate Tectonics
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Chapter 7
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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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Chapter 7
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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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Chapter 7
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2. Which of the following compositional layers makes
up the greatest percentage of Earth’s mass?
A continental crust
B oceanic crust
C the mantle
D the core
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2. Which of the following compositional layers makes
up the greatest percentage of Earth’s mass?
A continental crust
B oceanic crust
C the mantle
D the core
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3. How does fossil evidence support Wegener’s
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
Earth’s polarity.
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3. How does fossil evidence support Wegener’s
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
Earth’s polarity.
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4. Most of the world’s 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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4. Most of the world’s 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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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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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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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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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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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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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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8. The sinking of Earth’s crust to lower elevations is
called
A rebound.
B subsidence.
C uplift.
D deformation.
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8. The sinking of Earth’s crust to lower elevations is
called
A rebound.
B subsidence.
C uplift.
D deformation.
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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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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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Use the table to answer question 10.
10. According to the table, which of the following
statements is true?
A Oceanic crust is Earth’s thinnest
and least dense compositional
layer.
B Continental crust is Earth’s
thinnest and densest compositional
layer.
C The mantle is Earth’s thickest
and densest compositional layer.
D The core is Earth’s thickest and
densest compositional layer.
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Chapter 7
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Use the table to answer question 10.
10. According to the table, which of the following
statements is true?
A Oceanic crust is Earth’s thinnest
and least dense compositional
layer.
B Continental crust is Earth’s
thinnest and densest compositional
layer.
C The mantle is Earth’s thickest
and densest compositional layer.
D The core is Earth’s thickest and
densest compositional layer.
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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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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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12. The Cartersville fault formed when metamorphic
rocks from Georgia’s 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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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.
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