Earthquakes — Unit test Answers

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Which word identifies one stage of volcanic activity?

A
dormant
B
explosive
C
underground
D
quiet
2
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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
3

Which phrase describes a volcano that is not expected to erupt again?

A
quiet volcano
B
extinct volcano
C
dormant volcano
D
explosive volcano
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

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
6

Which feature forms at a divergent boundary?

A
rift valley
B
island arc
C
subduction zone
D
collision zone
7

Which statement describes convergent boundaries?

A
Rifts form.
B
Subduction occurs.
C
Plates push away from each other.
D
Mid-ocean ridges mark locations.
8

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
9

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!
10

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

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