Volcanoes — Unit test Answers

6 verified answers2 views
1
Free Preview

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
2
Free Preview

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.
3

Which statement describes the damage that results from earthquakes?

A
Amount of damage can be used to determine intensity.
B
Damage can be measured using the Richter scale.
C
The amount of damage increases as magnitude decreases.
D
Earthquakes that cause maximum damage are the most common.
4

Which statement describes the damage that results from earthquakes?

A
Amount of damage can be used to determine intensity.
B
Damage can be measured using the Richter scale.
C
The amount of damage increases as magnitude decreases.
D
Earthquakes that cause maximum damage are the most common.
5

Which is one piece of evidence of seafloor spreading?

A
fossil material
B
continent material
C
drilled core samples
D
ocean water samples
6

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
7

Which statement accurately describes one aspect of plate tectonics that involves subduction and seafloor spreading?

A
Older crust is melted at subduction zones.
B
Crust is created at the coastlines of continents.
C
Continents do not move as a result of seafloor spreading and subduction.
D
Crust is created as the mantle hardens under the lithosphere.
9

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.
11

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
12

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
13

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.
14

Which statement describes one event that happens at deep-ocean trenches?

A
Crust is formed.
B
Mountains are formed.
C
Seafloor spreading occurs.
D
Denser plates slide under lighter plates.
15

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.
16

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.
17

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
19

Which is one type of evidence that geologists usually study?

A
location of Earth in outer space
B
waves that move through Earth
C
interactions between living things on Earth
D
diversity of life found on Earth
20

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.

Did you find these answers helpful?