Volcanoes Answers

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The image shows Osorno in Chile, which last erupted in 1869.

Question illustration
A
shield volcano
B
active volcano
C
dormant volcano
D
explosive volcano
3

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!
4

Which word identifies one stage of volcanic activity?

A
dormant
B
explosive
C
underground
D
quiet
6

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
7

Which phrase describes a sill?

A
fills in valleys and rivers
B
is a hardened magma intrusion
C
cuts vertically through older rock layers
D
is built up by numerous eruptions over thousands of years
8

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
10

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.

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