Question 1

The measurement of ocean depth and the topography of the ocean floor are known as ________.

Accepted Answer

A) geophysics 
B) seismic tomography 
C) topographic surveying 
D) bathymetry 
A) geophysics 
B) seismic tomography 
C) topographic surveying 
D) bathymetry D

Question 2

________ accounts for greater ocean depths moving away from the oceanic ridge toward the deep ocean basin.

Accepted Answer

A) Mantle plume 
B) Convection 
C) Thermal contraction 
D) Gravity 
A) Mantle plume 
B) Convection 
C) Thermal contraction 
D) Gravity C

Question 3

Which of the following materials or features are not found at mid-ocean ridges?

Accepted Answer

A) Basaltic lava eruptions emitted along the ridge 
B) Stands higher above the surrounding seafloor 
C) Deep submarine trenches 
D) Thin layers of sediments 
A) Basaltic lava eruptions emitted along the ridge 
B) Stands higher above the surrounding seafloor 
C) Deep submarine trenches 
D) Thin layers of sediments C

Question 4

The Challenger Deep of the Mariana Trench is named for the H.M.S Challenger, the ship that first measured it.

Accepted Answer

A) True 
 B)False

Question 5

Which region is surrounded by an active continental margin?

Accepted Answer

A) Atlantic Ocean 
B) Arctic Ocean 
C) Pacific Ocean 
D) Indian Ocean 
A) Atlantic Ocean 
B) Arctic Ocean 
C) Pacific Ocean 
D) Indian Ocean

Question 6

What kind of continental margin is visible in this image?

Accepted Answer

A) Active 
B) Rift 
C) Passive 
D) Transform 
A) Active 
B) Rift 
C) Passive 
D) Transform

Question 7

Which of the following is not a possible mechanism contributing to continental rifting?

Accepted Answer

A) Changes in gravitational attraction of the moon 
B) Concentration of mantle plume heat beneath a continent 
C) Tensional stress 
D) Upwelling from shallow levels in the asthenosphere 
A) Changes in gravitational attraction of the moon 
B) Concentration of mantle plume heat beneath a continent 
C) Tensional stress 
D) Upwelling from shallow levels in the asthenosphere

Question 8

Compare seamounts and guyots.How do the two features differ?

Accepted Answer

Both are submarine volcanoes growing upw

Question 9

Which of the following will mark the furthest extent of a continent?

Accepted Answer

A) The shoreline 
B) Tidal flats exposed during low tide 
C) The crest of the continental slope 
D) The lowest part of the continental slope 
A) The shoreline 
B) Tidal flats exposed during low tide 
C) The crest of the continental slope 
D) The lowest part of the continental slope

Question 10

What is the average thickness of the oceanic crust?

Accepted Answer

A) 0 km 
B) 3 km 
C) 7 km 
D) 20 km 
A) 0 km 
B) 3 km 
C) 7 km 
D) 20 km

Question 11

Where do rift valleys form along the oceanic ridge system?

Accepted Answer

A) Along the flanks of the continent where the slope levels out to meet the seafloor 
B) Along the axis of some ridge segments where the rift is down-faulted 
C) Transecting the ridge where transform boundaries exist 
D) Where the seafloor plunges back into the mantle as the plate is consumed 
A) Along the flanks of the continent where the slope levels out to meet the seafloor 
B) Along the axis of some ridge segments where the rift is down-faulted 
C) Transecting the ridge where transform boundaries exist 
D) Where the seafloor plunges back into the mantle as the plate is consumed

Question 12

What generates the magma necessary for seafloor spreading?

Accepted Answer

A) Decompression melting 
B) Partial melting 
C) Mantle plumes 
D) Subduction 
A) Decompression melting 
B) Partial melting 
C) Mantle plumes 
D) Subduction

Question 13

Black smokers can be found along subduction zones.

Accepted Answer

A) True 
 B)False

Question 14

What tool is often used to measure the topography of the seafloor today?

Accepted Answer

A) High-resolution multibeam instruments 
B) Sonar 
C) Echo sounders 
D) Radar altimeters 
A) High-resolution multibeam instruments 
B) Sonar 
C) Echo sounders 
D) Radar altimeters

Question 15

Explain the process of accretionary wedge.

Accepted Answer

Sediments settle on the shallo

Question 16

Where is the deepest place on Earth?

Accepted Answer

A) Peru-Chile Trench 
B) Challenger Deep 
C) Kuril Trench 
D) Mid-Continent Rift 
A) Peru-Chile Trench 
B) Challenger Deep 
C) Kuril Trench 
D) Mid-Continent Rift

Question 17

Which of the following locations is an example of spontaneous subduction?

Accepted Answer

A) Mariana Trench 
B) Peru-Chile Trench 
C) East African Rift 
D) Cascadia Trench 
A) Mariana Trench 
B) Peru-Chile Trench 
C) East African Rift 
D) Cascadia Trench

Question 18

Because massive submarine structures such as seamounts and ridges exert stronger than average gravitational attraction, they produce depressed areas on the ocean's surface.

Accepted Answer

A) True 
 B)False

Question 19

Oceanic Ridge A has slow spreading rates of 2-5 cm/yr.Oceanic Ridge B has intermediate spreading rates of 6-9 cm/yr.Oceanic Ridge C has fast spreading rates of 10-11 cm/yr.Compare and contrast the topography and structure that would be present at all three spreading centers.

Accepted Answer

Slow-spreading centers like Ridge A will

Question 20

Describe the appearance of a rift valley that has started on land.How do these valleys form?

Accepted Answer

Extension creates a

Exam 13: Divergent Boundaries

The measurement of ocean depth and the topography of the ocean floor are known as ________.

________ accounts for greater ocean depths moving away from the oceanic ridge toward the deep ocean basin.

Which of the following materials or features are not found at mid-ocean ridges?

The Challenger Deep of the Mariana Trench is named for the H.M.S Challenger, the ship that first measured it.

Which region is surrounded by an active continental margin?

What kind of continental margin is visible in this image?

Which of the following is not a possible mechanism contributing to continental rifting?

Compare seamounts and guyots.How do the two features differ?

Which of the following will mark the furthest extent of a continent?

What is the average thickness of the oceanic crust?

Where do rift valleys form along the oceanic ridge system?

What generates the magma necessary for seafloor spreading?

Black smokers can be found along subduction zones.

What tool is often used to measure the topography of the seafloor today?

Explain the process of accretionary wedge.

Where is the deepest place on Earth?

Which of the following locations is an example of spontaneous subduction?

Because massive submarine structures such as seamounts and ridges exert stronger than average gravitational attraction, they produce depressed areas on the ocean's surface.

Oceanic Ridge A has slow spreading rates of 2-5 cm/yr.Oceanic Ridge B has intermediate spreading rates of 6-9 cm/yr.Oceanic Ridge C has fast spreading rates of 10-11 cm/yr.Compare and contrast the topography and structure that would be present at all three spreading centers.

Describe the appearance of a rift valley that has started on land.How do these valleys form?

An Introduction to Geology

Plate Tectonics: a Scientific Revolution Unfolds

Matter and Minerals

Magma, Igneous Rocks, and Intrusive Activity

Volcanoes and Volcanic Hazards

Weathering and Soil

Sedimentary Rocks

Metamorphism and Metamorphic Rocks

Geologic Time

Crustal Deformation

Earthquakes

Earths Interior

Convergent Boundaries

Mass Wasting

Running Water

Groundwater

Glaciers and Glaciation

Deserts and Winds

Shorelines

Global Climate Change

Earths Evolution Through Geologic Time

Energy and Mineral Resources

Touring Our Solar System

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