Question 1

Which two continents rifted apart to form the central Atlantic Ocean?

Accepted Answer

A)   India and Australia
B)   South America and Antarctica
C)   Europe and Asia
D)   North America and Africa
E)   none of theseF) All of the above
G) C) and E)

Question 2

This figure shows ages of seafloor. Which of the numbered sites is on the youngest seafloor, based on its position?

Accepted Answer

A)   1
B)   2
C)   3
D)   4E) None of the above
F) A) and B)

Question 3

This map shows plate boundaries in the Caribbean region. Which number is closest to a transform boundary?

Accepted Answer

A)   1
B)   2
C)   3
D)   4
E)   5F) B) and C)
G) A) and B)

Question 4

This figure shows ages of seafloor. Which of the numbered sites is on the deepest seafloor, based on its position?

Accepted Answer

A)   1
B)   2
C)   3
D)   4E) B) and C)
F) A) and C)

Question 5

What type of feature is interpreted to cause some parts of the Caribbean to be shallower than expected?

Accepted Answer

A)   seafloor spreading along the Mid-Atlantic Ridge
B)   an impact crater that formed at about the time that the dinosaurs died
C)   an oceanic plateau that may have originated in the Pacific
D)   a currently active hot spot that is not associated with volcanoesE) All of the above
F) A) and B)

Question 6

What method produces images of the materials beneath the seafloor using sound waves?

Accepted Answer

A)   Seismic-reflection profiling
B)   Ocean drilling
C)   Satellites
D)   SubmersiblesE) B) and C)
F) A) and D)

Question 7

On the map shown, R has the youngest oceanic crust because:

Accepted Answer

A)   it is at a spreading center
B)   it is at a passive margin
C)   it is at a trenchD) A) and B)
E) None of the above

Question 8

Which of the following is the present plate-tectonic setting of oceanic crust in the Bering Sea?

Accepted Answer

A)   it contains a mid-ocean ridge
B)   it is being generated by back-arc spreading
C)   it does not contain any currently active plate boundaries
D)   it was formed by thinning of continental crustE) None of the above
F) All of the above

Question 9

How did the South Atlantic Ocean Form?

Accepted Answer

A)   Asia rifted apart from Europe
B)   Africa and North America collided to form the Appalachian Mountains
C)   a piece of California started moving northward up the west coast
D)   South America rifted apart from Africa
E)   none of theseF) A) and E)
G) A) and D)

Question 10

Oceanic plateaus form from basaltic volcanism originating from:

Accepted Answer

A)   hot spots
B)   mid-ocean ridges
C)   trenchesD) None of the above
E) B) and C)

Question 11

Where was seafloor spreading occurring in the Investigation area?

Accepted Answer

A)   in the middle of the ocean between two continents
B)   beneath a line of islands in the center of the region
C)   within the central continent
D)   within the eastern continent
E)   all of theseF) C) and D)
G) B) and E)

Question 12

What occurs near black smokers?

Accepted Answer

A)   circular features called chimneys)  form, composed of sulfide and sulfate minerals
B)   heated fresh water is derived from the land
C)   organic-rich shale burns in the subsurface
D)   coal-rich layers burn in the subsurface
E)   none of theseF) B) and D)
G) B) and C)

Question 13

What is currently the dominant type of motion along the northern boundary of the Caribbean plate?

Accepted Answer

A)   subduction of the Caribbean plate beneath Cuba
B)   subduction of the Gulf of Mexico beneath the Caribbean plate
C)   subduction of the Caribbean plate beneath the volcanoes of Central America
D)   seafloor spreading that is moving North America farther from South America
E)   a long transform fault moving the Caribbean plate eastward relative to North AmericaF) A) and D)
G) B) and C)

Question 14

Which of the following is associated with a fast-spreading ridge?

Accepted Answer

A)   rates of about 10 centimeters per year or more
B)   a broad ridge because the rocks remain hotter farther from the center of spreading
C)   less of a deep central rift than in a slow spreading ridge
D)   all of theseE) B) and D)
F) All of the above

Question 15

Submarine canyons in the continental slope are eroded by:

Accepted Answer

A)   turbidity currents
B)   rivers
C)   glaciersD) All of the above
E) A) and B)

Question 16

Which of the following locations contains modern coral reefs?

Accepted Answer

A)   Bahamas
B)   Philippines
C)   Polynesia
D)   All of these locations are contain modern coral reefsE) A) and D)
F) B) and C)

Question 17

This figure shows ages of seafloor. Which of the numbered sites is on the oldest seafloor, based on its position?

Accepted Answer

A)   1
B)   2
C)   3
D)   4E) A) and B)
F) None of the above

Question 18

What process thins the continental crust before it meets the oceanic crust at the continental slope?

Accepted Answer

A)   normal faulting
B)   subduction
C)   river erosion
D)   sediment depositionE) C) and D)
F) None of the above

Question 19

The area behind an island arc that develops a spreading center is a an) :

Accepted Answer

A)   back-arc basin
B)   trench
C)   abyssal plain
D)   passive marginE) A) and B)
F) A) and C)

Question 20

Why did the Great Barrier Reef in Australia grow upward, forming the largest organic structure on Earth?

Accepted Answer

A)   Sea level rose.
B)   Sea level fell.
C)   Elevation of the seafloor rose.D) All of the above
E) B) and C)

Exam 10: Seafloor and Continental Margins

Which two continents rifted apart to form the central Atlantic Ocean?

Correct AnswerverifiedShow Answer

Why did the Great Barrier Reef in Australia grow upward, forming the largest organic structure on Earth?

Correct AnswerverifiedShow Answer

Which of the following is the present plate-tectonic setting of oceanic crust in the Bering Sea?

Correct AnswerverifiedShow Answer

Which of the following locations contains modern coral reefs?

Correct AnswerverifiedShow Answer

Which of the following is associated with a fast-spreading ridge?

Correct AnswerverifiedShow Answer

This figure shows ages of seafloor. Which of the numbered sites is on the oldest seafloor, based on its position?

Correct AnswerverifiedShow Answer

What type of feature is interpreted to cause some parts of the Caribbean to be shallower than expected?

Correct AnswerverifiedShow Answer

This map shows plate boundaries in the Caribbean region. Which number is closest to a transform boundary?

Correct AnswerverifiedShow Answer

How did the South Atlantic Ocean Form?

Correct AnswerverifiedShow Answer

Submarine canyons in the continental slope are eroded by:

Correct AnswerverifiedShow Answer

What occurs near black smokers?

Correct AnswerverifiedShow Answer

This figure shows ages of seafloor. Which of the numbered sites is on the deepest seafloor, based on its position?

Correct AnswerverifiedShow Answer

On the map shown, R has the youngest oceanic crust because:

Correct AnswerverifiedShow Answer

What is currently the dominant type of motion along the northern boundary of the Caribbean plate?

Correct AnswerverifiedShow Answer

Oceanic plateaus form from basaltic volcanism originating from:

Correct AnswerverifiedShow Answer

What method produces images of the materials beneath the seafloor using sound waves?

Correct AnswerverifiedShow Answer

What process thins the continental crust before it meets the oceanic crust at the continental slope?

Correct AnswerverifiedShow Answer

The area behind an island arc that develops a spreading center is a an) :

Correct AnswerverifiedShow Answer

This figure shows ages of seafloor. Which of the numbered sites is on the youngest seafloor, based on its position?

Correct AnswerverifiedShow Answer

Where was seafloor spreading occurring in the Investigation area?

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

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