Volcanoes Answers

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Which feature is created on the exterior of a volcano when it erupts?

A
magma chamber
B
crater
C
hot spot
D
boundary
2
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Which phrase describes a lava plateau?

A
steep-sided mountain
B
gently sloping mountain
C
hardened magma in a pipe
D
volcanic material in valleys
3

Heat from magma deep beneath the Earth's surface warms underground water, which then rises due to temperature differences. This heated water emerges naturally, creating geothermal features.

A
dike
B
hot spring
C
lava plateau
D
mud pot
4

The photo shows Old Faithful in Yellowstone National Park.

Question illustration
A
It is a caldera formed from a vent collapsing.
B
It is a mud pot formed from pools of boiling, acidic mud.
C
It is a volcanic neck that formed as a result of magma that never erupted.
D
It is a geyser that formed due to water heated by magma erupting at Earth’s surface.
5

A volcano that has not erupted in a very long time suddenly has a plume of steam coming from it. Which best describes this volcano?

A
was dormant and is now active
B
was quiet and is now active
C
was extinct and is now explosive
D
was dormant and is now explosive
6

The image shows a volcano erupting at night in Russia.

Question illustration
A
Explosive eruption—beware of ash!
B
Gases push out magma with great force!
C
Volcano quietly erupts due to low-viscosity magma!
D
High silica content of magma results in lava reaching sea level by morning!
7

Erosion and deposition constantly change Earth’s surface. Erosion carries natural materials like rock and soil from one place to another. Through deposition, these natural materials may be deposited in areas where they build up over time.

A
sill
B
mud pot
C
caldera
D
lava plateau
8

Which word identifies one stage of volcanic activity?

A
dormant
B
explosive
C
underground
D
quiet
9

Which statement explains what happens as magma rises inside a volcano?

A
Gases will contract in the chamber.
B
The pressure of the gas will disappear.
C
The magmatic pressure decreases.
D
Magma moves to other chambers.
10

Mount St. Helens is a volcano that erupted with great force in 1980. Which phrase best describes this eruption?

A
quiet eruption
B
gentle lava flows
C
magma low in silica
D
high-viscosity magma
11

The image shows the locations of volcanoes around the world.

Question illustration
A
Many volcanoes are on the eastern coast of Asia.
B
Most volcanoes are in the center of continents.
C
No volcanoes are found in the middle of the ocean.
D
Many volcanoes are on the eastern coasts of North and South America.
12

Which phrase describes a volcano that is not expected to erupt again?

A
quiet volcano
B
extinct volcano
C
dormant volcano
D
explosive volcano
13

Which feature forms at a divergent boundary?

A
rift valley
B
island arc
C
subduction zone
D
collision zone
14

A volcano erupts, and lava flows down a mountainside. Which statement best describes this eruption?

A
This is a quiet eruption caused by low-viscosity magma.
B
This is an explosive eruption caused by high-viscosity magma.
C
This is a quiet eruption with lava spewing out violently.
D
This is an explosive eruption during which gases bubble out gently.

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