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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Which statement describes convergent boundaries?

A
Rifts form.
B
Subduction occurs.
C
Plates push away from each other.
D
Mid-ocean ridges mark locations.
3

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.
4

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
5

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
6

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
7

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
8

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
9

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
10

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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