Volcanoes Answers

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1
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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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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.
3

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
4

Which word identifies one stage of volcanic activity?

A
dormant
B
explosive
C
underground
D
quiet
5

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
6

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.
7

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
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

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
10

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

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