1 The ocean crust is composed mostly of: basalt gneiss peridotie granite 2 The s
ID: 803896 • Letter: 1
Question
1The ocean crust is composed mostly of:
basalt
gneiss
peridotie
granite
2 The sea-floor spreading theory claims? Choose all the correct statements. Any incorrect answer you choose will cancel a correct one! (Multiple Choices)
that the ocean floor is oldest at mid-oean ridges and youngest at trenches
that the ocean floor is created at mid-ocean ridges and
That the ocean floor is youngest at ocanic ridges and oldest at trenches
that the ocean floor is magnetized with reverse magnetization at all oceanic ridges
that the ocean floor has alternating reverse and normal magnetization areas according to its time of formation at the oceanic ridges
3The evidence that the Earth’s magnetic field periodically reverts its polarity is found in: (Multiple Choices)
sequences of volcanic rocks at many continental volcanoes in vertical patterns
in all of the ocean floors in a horizontal pattern
sequences of volcanic rocks at many continental volcanoes in horizontal patterns
in all of the ocean floors in a vertical pattern
4The diagram below shows a series of volcanic islands with their age labeled. A scale is also provided to measure the distance between islands. Using this diagram, answer the following questions: 1. how fast is the plate moving (in cm/year) Notice that scale is in KM.
GIVE THE ANSWER AS A SINGLE NUMBER! It is assumed it is cm/year. No decimals (approximate to the closest number), no units or other words!
SHOW YOUR WORK for full credit.
5
Contrast lithosphere and asthenosphere in terms of their density and rigid vs plastic behavior. Choose all statements that are correct! (Multiple Choices)
The lithosphere is denser and rigid
The asthenosphere is denser and rigid
The lithosphere is less dense and rigid
The asthenosphere is denser and plastic
The asthenosphere is less dense and plastic
The lithosphere is less dense and plastic
6
Volcanoes are located on the west coast of South America but not on the east coast because... Choose all that are correct(Multiple Choices)
.
.
The east cost does not lie on an active plate boundary
The west Coast is an area with active subduction
The wast coast is a active continental margins
The west coast is a passive continental margin
The west coast is bordered by trenches
the east coast is bordered by trenches
7
The type of plate boundary that runs through California is called ??? , and the name of the fault marking this plate boundary is the .???
8
At what 2 types of convergent plate boundaries are trenches present? (Multiple Choices)
O-C Convergent
O-O Convergent
O-O Divergent
C-C Divergent
9
Convection is a process believed to be active in which of Earth's layers?
crust
asthenosphere
inner core
lithosphere
10
Lithospheric plates move on the Earth's surface because:
convection in the asthenosphere involving warm mantle rising at ridges and cool mantle descending at subduction zones.
convection in the inner core
convection in the asthenosphere involving cool mantle rising at ridges and warm mantle descending at subduction zones
11
Earthquakes occur at
convergent and transform plate boundaries
divergent and convergent plate boundaries
transform and divergent plate boundaries
at all plate boundaries
12
Large, high mountain ranges without volcanoes are built at which type of plate boundary?
divergent: oceanic-oceanic
convergent: continental-continental
transform: continental-continental
divergent: continental-continental
13
Which of the following is NOT associated with a mid-oceanic ridge?
old oceanic crust
shallow-depth earthquakes
volcanic eruptions
hot water
14
At transform plate boundaries:
lithosphere is neither created nor destroyed
plates converge
active volcanism occurs
earthquakes do not occur
15
Which of the following locations is an example of a C-C Convergent plate boundary?
The Aleutian Islands
The Cascades
the Hymalayas
the Olympics
16
Which of the following is an example of a Ocean-Ocean Divergent plate boundary?
the Andes Mountains
the Himalayan Mountains
the East Pacific Rise
the Appalachians
17
Ocean floor is created at ___________
in deep sea trenches
in subduction zones
at mid-ocean ridges
along transform faults
18
0.5 pts
Geologists recognize three major types of plate boundaries, which are:
resurgent, divergent, and emergent.
convergent, divergent, and transform.
transcurrent, oblique, and resurgent.
emergent, transform, and convergent.
transform, transcurrent, and translateral.
19
At a mid-oceanic ridge spreading center:
the plates are moving past each other.
the plates are moving away from each other.
the plates are moving toward each other.
one plate is being subducted beneath another.
both plates are being subducted.
20
Which of the following is an example of a mountain range formed at a Ocean-Continent Convergent plate boundary?
the Cascades
the Himalayan Mountains
the East Pacific Rise
the Appalachians
21
Volcanic activity occurs at 4 of the 7 plate boundaries. Choose the correct 4 boundaries (Multiple Choices)
Ocean-Ocean Transform
Continent-Continent Transform
Continent-Continent Divergent
Ocean-Ocean Divergent
Ocean-Ocean Convergent
Ocean-Continent Convergent
Continent-Continent Convergent
22
FILL MULTIPLE BLANKS:
According to plate tectonic theory, why are there volcanoes in Hawaii?
Use two words only____ ____
basalt
gneiss
peridotie
granite
Explanation / Answer
1) Basalt
The oceanic crust is mainly divided into 3 layers . Layer 1 is composed of contourites and layer 2 is composed of basaltic dykes and layer 3 is gabbro/basalt
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