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Volcanoes — Unit test Answers

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21
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Which plate forms a boundary with the African Plate?

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A
Pacific
B
South American
C
Nazca
D
Philippine
22
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In which layer of the Earth does the motion of the convection currents drive plate movement?

A
mantle
B
outer core
C
inner core
D
lithosphere
23

Which statement describes seismic waves?

A
They carry energy.
B
They move in one direction.
C
They originate from the epicenter.
D
They only vibrate at Earth’s surface.
24

Which increases along faults and leads to rock breaking?

A
damage
B
earthquake
C
focus
D
stress
25

What evidence of climate change on continents supports the theory of continental drift?

A
signs that glaciers existed in South Africa
B
similar coal fields on different continents
C
change in atmospheric temperature over time
D
same animal fossils found on different continents
26

What may occur when convergent boundaries interact?

A
formation of island chains
B
creation of mid-ocean ridges
C
creation of convection currents
D
formation of rift valleys
27

Which is one step that geologists use to find the epicenter of an earthquake?

A
They look at data from at least one seismograph.
B
They measure the difference between arrival of P waves and S waves.
C
They draw circles around the epicenter from three locations.
D
They obtain information about the intensity of earthquakes from seismographs.
28

Which statement describes one of Wegener’s ideas that contributed to the theory of continental drift?

A
The continents drifted apart due to repeated meteor impacts.
B
The continents were once connected as one landmass.
C
The continents have moved apart very quickly due to earthquakes.
D
The continents are magnetically pulled toward or pushed away from one another.
29

Which indicates how evidence of climate change supports the theory of continental drift?

A
coal fields in several continents
B
volcano formation
C
glacial evidence found in South Africa
D
folded mountains in Africa and South America
30

How do geologists study direct evidence of Earth’s interior?

A
by collecting drill core samples of Earth’s crust
B
by measuring seismic wave activity
C
by analyzing how living things survive
D
by recording changes in climate patterns
31

Which statement best describes the theory of plate tectonics?

A
Plates sometimes move closer to one another.
B
Sections of Earth that shift are part of Earth’s asthenosphere.
C
Sections of Earth’s continents are in slow, constant movement.
D
Parts of the ocean floor move as they are carried by rift valleys.

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