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!
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.

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