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Multiple Choice
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1
The Oceans cover about 55% of the earth's surface.
A)True
B)False
2
Of all the oceans, the Pacific has the deepest trench.
A)True
B)False
3
The Pacific, Indian, and Atlantic Oceans are all connected around Antarctica by a body of water termed the Southern Ocean.
A)True
B)False
4
The Arctic Ocean is a major basin that is cut off from all others.
A)True
B)False
5
The Earth's innermost layer, or core, consists mainly of solid and liquid granite.
A)True
B)False
6
Oceanic crust consists mainly of basalt and is denser than continental crust.
A)True
B)False
7
Magnetic anomalies are bands of rock that run at right angles to the mid-ocean ridge system.
A)True
B)False
8
The San Andreas Fault in California is an example of a spreading center.
A)True
B)False
9
The Himalaya mountains formed from the collision of a seafloor and a continental plate.
A)True
B)False
10
The Aleutian islands formed from the collision of two seafloor plates.
A)True
B)False
11
In general, the seafloor crust is much older than the continental crust.
A)True
B)False
12
Red clay is an example of a biogenous sediment.
A)True
B)False
13
Most of the deep-sea sediments are gravel and sand because these heavier sediments roll down the continental slopes to the deep sea more easily than do silt or clay.
A)True
B)False
14
Siliceous sediments are biogenous oozes formed mostly from shells of microscopic organisms.
A)True
B)False
15
Sea levels were higher during the ice ages due to the large number of glaciers entering the oceans.
A)True
B)False
16
Because they lack subduction zones, the east coasts of North and South America have more flat coastal plains than do the west coasts.
A)True
B)False
17
In the Hawaiian island chain, the islands are older the farther west they are.
A)True
B)False
18
Hot spots, which create volcanoes, are always found on spreading-center ridges.
A)True
B)False
19
Guyots can be found on the Pacific deep-sea floor.
A)True
B)False
20
Black smokers are chimney-like deposits formed when molten seafloor basalt emerged at a rift valley and cooled upon contacting seawater.
A)True
B)False
21
Evidence for continental drift and plate tectonics includes
A)geological features in the Americas and in Asia that line up on opposite sides of the Pacific.
B)seafloor rocks that are older the farther they are from the crest of a mid-ocean ridge.
C)magnetic anomalies in stripes parallel to the continent's major mountain ranges.
D)both a and b.
22
An example of a subduction zone is
A)the East Pacific Rise.
B)The San Andreas Fault.
C)the Mariana Trench.
D)the seafloor bordering eastern South America.
23
The ancient ocean called Panthalassa became the ancestor of which ocean?
A)Atlantic
B)Pacific
C)Indian
D)Arctic
24
The biologically richest part of the seafloor is
A)the continental shelf.
B)the continental slope.
C)deep-sea fans.
D)the abyssal plain.







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