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Unit 7 Test
Test Description: The Dynamic Earth
Instructions: Answer all questions to get your test result.
1) Scientists divide Earth into three main layers: the core, the mantle, and the crust. How are these three layers identified?
A
By their structural features
B
By their physical properties
C
By their plate tectonics
D
By their chemical composition
2) What is the asthenosphere?
A
The outermost, rigid layer of Earth.
B
The liquid layer of the Earths core.
C
A layer of weak or soft mantle that is made of rock that flows slowly.
D
The strong lower part of the mantle.
3) Most divergent plate boundaries lie under the worlds ocean. Which of the following us a process that occurs at divergent boundaries?
A
formation of continental crust
B
recycling of crust material
C
magnetic reversals
D
formation of mid-ocean ridges
4) What happens at a subduction zone, where an oceanic plate and a continental plate converge.
A
Volcanic mountain ranges form
B
An ocean forms
C
Sea-floor spreading occurs as the oceanic plate moves
D
A transform boundary forms where the subduction occurs.
5) Which of the following statements describes a tectonic plate?
A
A continent or an ocean
B
A block of the lithosphere that moves around on top of the asthenosphere
C
The structural layer of Earth is made of the crust and the rigid, upper part of the mantle.
D
The outermost compositional layer of Earth
6) Which of the following land features is caused by the movement of tectonic plates?
A
River
B
Sinkhole
C
Glacier
D
Mountain
7) Which of the following describes what could happen when two continents collide?
A
Folded mountains formed as a result of tensional stress.
B
Fault-block mountains formed as a result of tensional stress.
C
Fault-block mountains formed as a result of compressional stress.
D
Folded mountains formed as a result of compressional stress.
8) Compression at a convergent boundary causes what to form?
A
Fault block mountains
B
Folded mountains
C
None of the above
D
Volcanic mountains
9) What type of motion happens in a normal fault?
A
The walls move side to side past each other horizontally.
B
The hanging wall drops down relative to the footwall.
C
The hanging wall moves up relative to the footwall.
D
The footwall drops down relative to the hanging wall.
10) Volcanic vents are places where magma can erupt onto Earth surface. Which volcanic feature forms a relatively small depression around a volcano's vent?
A
caldera
B
crater
C
lava plateau
D
fissure
11) Which of the following best defines lava
A
Lava is magma that has cooled to form solid rock.
B
Lava is any place where gas, ash, or melted rock come out of the ground.
C
Lava is molten rock that flows on Earth's surface
D
Lava is melted rock found in underground chambers
12) Which type of volcano is made mostly of pyroclastic materials?
A
composite volcano
B
shield volcano
C
cinder cone
D
stratovolcano
13) A volcano with magma that has high viscosity, so gas bubbles cannot escape easily. As bubbles expand, magma rises faster. The magma can then erupt EXPLOSIVELY, releasing gas, ash, and large chunks of rock. This type happens at what type of boundary?
A
convergent plate boundary
B
transform plate boundary
C
divergent plate boundary
D
hot spot
14) What causes an earthquake to happen?
A
Rocks along a fault move suddenly and release energy
B
Large amounts of rock suddenly shift downward when large holes form underground.
C
Rocks deform slowly as a result of physical stress
D
Energy is transferred to rock layers from convection currents in the oceans and the atmosphere.
15) What is the difference in density between the least dense rocks at Earth's surface and the densest rock in the center of Earth? (Continental crust=2.2; Oceanic crust=3.0; Mantle=3.3; Outer core=9.9; Inner core=13.1)
A
15.3
B
10.9
C
12.1
D
13.6
16) Where are most of Earths eathquakes located?
A
deformation
B
Tectonic plate
C
None of the above
D
Tectonic plate boundaries
*select an answer for all questions
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