Volcanoes — Unit test Answers

0 verified answers
1
Free Preview

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.
2
Free Preview

Which increases along faults and leads to rock breaking?

A
damage
B
earthquake
C
focus
D
stress
3

The image shows the Great Rift Valley in Africa, an example of a rift valley.

Question illustration
A
The rift valley formed when the crust pulled apart.
B
The rift valley formed due to subduction.
C
The rift valley formed similarly to an island arc.
D
The rift valley formed at a convergent boundary.
4

The image below shows a fault.

Question illustration
A
The hanging wall and footwall both move vertically.
B
Shearing is causing the plates to slide past each other.
C
The hanging wall moves down in relation to the footwall.
D
Compression is causing the plates to move toward each other.
5

How did Wegener explain why fossils of land animals were found on continents that are across oceans from one another?

A
Animals evolved separately on each continent.
B
Land bridges existed between the continents.
C
Animals swam across the ocean to new continents.
D
Continents were once one landmass and have drifted apart.
6

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.
7

What does the presence of new rock near an oceanic ridge indicate?

A
There is always a deep-sea trench underneath.
B
There is evidence of seafloor spreading.
C
They are made from oceanic crust.
D
They have iron oriented in different directions.
8

Sophia was studying with Maalik about the layers of the Earth. They were given several different statements about the layers.Which statement about the layers would they identify as correct?

A
The outer core is less than 70 km in thickness.
B
The crust assists in forming Earth’s magnetic field.
C
The mantle is denser than the crust.
D
Pressure increases when moving from the core to the crust.
9

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
10

Which is one piece of evidence of seafloor spreading?

A
fossil material
B
continent material
C
drilled core samples
D
ocean water samples
11

Which feature forms when magma cools beneath Earth’s surface?

A
geysers
B
calderas
C
batholiths
D
vents
12

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
13

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.
14

The image shows mountains in Alaska.

Question illustration
A
A syncline is visible.
B
An anticline is visible.
C
These mountains show no evidence of folding.
D
These mountains likely formed from normal faults.
15

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
16

This image shows a volcanic eruption in Hawaii with lava flowing into the sea.

Question illustration
A
Its magma is high in silica.
B
Its magma has low viscosity.
C
Its gases are released in rapid bursts.
D
Its lava came from an explosive eruption.
17

When were Earth’s landmasses first recognizable as the continents we know today?

A
10 million years ago
B
135 million years ago
C
180 million years ago
D
300 million years ago
18

Which type of stress causes rocks to fold?

A
compression
B
shearing
C
strike-slip
D
tension
19

Study the diagram showing the range of temperature in the Earth’s layers.

Question illustration
A
1,613°C
B
2,521°C
C
3,628°C
D
6,217°C
20

Which feature of Earth is created at mid-ocean ridges?

A
new island chain
B
new underwater caves
C
new continents
D
new ocean floor

Did you find these answers helpful?