Volcanoes Answers

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1
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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.
2
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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.
3

Which event causes a volcanic eruption?

A
magma turning into lava
B
water being heated by magma
C
explosions occurring in magma chambers
D
magma cutting through older rocks
4

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.
5

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!
6

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

A
magma chamber
B
crater
C
hot spot
D
boundary
7

Earth’s surface is constantly changed by erosion and deposition. Erosion breaks down Earth’s surface by carrying materials away from an area. Deposition builds up Earth’s surface when these materials are deposited in an area over time.

A
volcanic soil
B
cinder cone
C
caldera
D
lava plateau
8

Which statement describes convergent boundaries?

A
Rifts form.
B
Subduction occurs.
C
Plates push away from each other.
D
Mid-ocean ridges mark locations.
9

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.
10

Which word identifies one stage of volcanic activity?

A
dormant
B
explosive
C
underground
D
quiet

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