Question 1

The island of Iceland appears to be an exposed section of the Atlantic mid-oceanic ridge.

Accepted Answer

A) True 
 B)False  True

Question 2

Turbidity currents are great masses of sediment-laden water that are pulled downhill by ____.

Accepted Answer

A)  landslides 
B)  submarine canyons 
C)  gravity 
D)  earthquakes, storms, volcanic eruptions 
E)  Earth's rotation 
A)  landslides 
B)  submarine canyons 
C)  gravity 
D)  earthquakes, storms, volcanic eruptions 
E)  Earth's rotation C

Question 3

_______ is an island on a mid-oceanic ridge.

Accepted Answer

A)  Madagascar 
B)  Japan 
C)  Cuba 
D)  Hawaii 
E)  Iceland 
A)  Madagascar 
B)  Japan 
C)  Cuba 
D)  Hawaii 
E)  Iceland E

Question 4

Thick deposits of sediment called _____ are found at the base of many submarine canyons.

Accepted Answer

A)  abyssal fans 
B)  continental rises 
C)  continental slopes 
D)  continental shelves 
E)  guyots 
A)  abyssal fans 
B)  continental rises 
C)  continental slopes 
D)  continental shelves 
E)  guyots

Question 5

The study of _____ rocks, sediment, and topography provided most of the information that led to the concept of plate tectonics.

Accepted Answer

A)  seafloor 
B)  ocean boundaries containing 
C)  continental interior 
D)  mid-oceanic ridge 
E)  abyssal plains 
A)  seafloor 
B)  ocean boundaries containing 
C)  continental interior 
D)  mid-oceanic ridge 
E)  abyssal plains

Question 6

Continental slopes are often marked by lines of hot springs that precipitate metals.

Accepted Answer

A) True 
 B)False

Question 7

Ophiolitic sediment is composed of wind-blown dust and microscopic skeletons that settle slowly to the sea floor.

Accepted Answer

A) True 
 B)False

Question 8

An oceanic trench is a deep narrow rift parallel to the crest of a mid-oceanic ridge.

Accepted Answer

A) True 
 B)False

Question 9

Most geologists think that the flat summits of seamounts ___.

Accepted Answer

A)  are uplifted sea floor 
B)  were eroded flat by wave action 
C)  are fault surfaces 
D)  are remnants of the continental shelf 
E)  are remnants of plateau basalts 
A)  are uplifted sea floor 
B)  were eroded flat by wave action 
C)  are fault surfaces 
D)  are remnants of the continental shelf 
E)  are remnants of plateau basalts

Question 10

Abyssal fans are made up of _____ sediment that has moved down submarine canyons

Accepted Answer

A)  abyssal 
B)  continental slope 
C)  deep sea 
D)  marine pelagic 
E)  land-derived 
A)  abyssal 
B)  continental slope 
C)  deep sea 
D)  marine pelagic 
E)  land-derived

Question 11

_____ are major lines of weakness in Earth's crust that cross the mid-oceanic ridge at right angles.

Accepted Answer

A)  Abyssal fans 
B)  Fracture zones 
C)  Submarine canyons 
D)  Transform faults 
E)  Fold belts 
A)  Abyssal fans 
B)  Fracture zones 
C)  Submarine canyons 
D)  Transform faults 
E)  Fold belts

Question 12

The continental rise typically ends at a(n) _______ at a depth of about 5 kilometers.

Accepted Answer

A)  slope 
B)  trench 
C)  abyssal plain 
D)  mid-oceanic ridge 
E)  continental slope 
A)  slope 
B)  trench 
C)  abyssal plain 
D)  mid-oceanic ridge 
E)  continental slope

Question 13

Pelagic sediment is sediment that settles slowly through the ocean water.

Accepted Answer

A) True 
 B)False

Question 14

Seismic surveys of the sea have shown the oceanic crust to be divided into _______ major layers.

Accepted Answer

A)  3 
B)  6 
C)  5 
D)  2 
E)  7 
A)  3 
B)  6 
C)  5 
D)  2 
E)  7

Question 15

All rocks and sediments of the sea floor are more than 3 billion years old.

Accepted Answer

A) True 
 B)False

Question 16

The _____ crust of the sea floor is covered in many places with layers of sediment.

Accepted Answer

A)  basalt 
B)  granite 
C)  rhyolite 
D)  serpentine 
E)  andesite 
A)  basalt 
B)  granite 
C)  rhyolite 
D)  serpentine 
E)  andesite

Question 17

Earthquakes, volcanoes, Benioff seismic zones, and island arcs are all associated with this sea floor feature.

Accepted Answer

A)  guyots 
B)  passive margin 
C)  seamounts 
D)  oceanic trench 
E)  abyssal plains 
A)  guyots 
B)  passive margin 
C)  seamounts 
D)  oceanic trench 
E)  abyssal plains

Question 18

Mid-oceanic ridges are often marked by lines of _____ that carry and precipitate metals.

Accepted Answer

A)  ocean currents 
B)  hot springs 
C)  seismic ridges 
D)  submarine volcanoes 
E)  ocean trenches 
A)  ocean currents 
B)  hot springs 
C)  seismic ridges 
D)  submarine volcanoes 
E)  ocean trenches

Question 19

The abyssal plains are formed of _____.

Accepted Answer

A)  sediment from meteoric dust 
B)  pillow basalts 
C)  mid-oceanic ridges 
D)  horizontal layers of sediment 
E)  volcanic ash 
A)  sediment from meteoric dust 
B)  pillow basalts 
C)  mid-oceanic ridges 
D)  horizontal layers of sediment 
E)  volcanic ash

Question 20

Abyssal plains are the flattest features on Earth.

Accepted Answer

A) True 
 B)False

Exam 18: The Sea Floor

The island of Iceland appears to be an exposed section of the Atlantic mid-oceanic ridge.

Turbidity currents are great masses of sediment-laden water that are pulled downhill by ____.

_______ is an island on a mid-oceanic ridge.

Thick deposits of sediment called _____ are found at the base of many submarine canyons.

The study of _____ rocks, sediment, and topography provided most of the information that led to the concept of plate tectonics.

Continental slopes are often marked by lines of hot springs that precipitate metals.

Ophiolitic sediment is composed of wind-blown dust and microscopic skeletons that settle slowly to the sea floor.

An oceanic trench is a deep narrow rift parallel to the crest of a mid-oceanic ridge.

Most geologists think that the flat summits of seamounts ___.

Abyssal fans are made up of _____ sediment that has moved down submarine canyons

_____ are major lines of weakness in Earth's crust that cross the mid-oceanic ridge at right angles.

The continental rise typically ends at a(n) _______ at a depth of about 5 kilometers.

Pelagic sediment is sediment that settles slowly through the ocean water.

Seismic surveys of the sea have shown the oceanic crust to be divided into _______ major layers.

All rocks and sediments of the sea floor are more than 3 billion years old.

The _____ crust of the sea floor is covered in many places with layers of sediment.

Earthquakes, volcanoes, Benioff seismic zones, and island arcs are all associated with this sea floor feature.

Mid-oceanic ridges are often marked by lines of _____ that carry and precipitate metals.

The abyssal plains are formed of _____.

Abyssal plains are the flattest features on Earth.

Introducing Geology, the Essentials of Plate Tectonics, and Other Important Concepts

Atoms, Elements, and Minerals

Igneous Rocks, Intrusive Activity, and the Origin of Igneous Rocks

Volcanism and Extrusive Rocks

Weathering and Soil

Sediment and Sedimentary Rocks

Metamorphism, Metamorphic Rocks, and Hydrothermal Rocks

Time and Geology

Mass Wasting

Streams and Floods

Ground Water

Glaciers and Glaciation

Deserts and Wind Action

Waves, Beaches, and Coasts

Geologic Structures

Earthquakes

Earths Interior and Geophysical Properties

Plate Tectonics

Mountain Belts and the Continental Crust

Climate Change

Resources

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