Multiple Choice
Identify the
choice that best completes the statement or answers the question.
|
|
|
1.
|
Which of the following would you expect to see during a nonexplosive
eruption?
A. | hot debris, ash, and gas shooting into the air | B. | molten rock blowing
into the air | C. | calm lava flows | D. | violent
explosions |
|
|
|
2.
|
Pillow lava
A. | forms a brittle crust that would be painful to walk on. | B. | has a glassy surface
with rounded wrinkles. | C. | usually oozes from a
volcano. | D. | forms when lava erupts under water. |
|
|
|
3.
|
Which of the following would you expect after an explosive eruption?
A. | warmer temperatures | C. | calm lava flows | B. | darkened skies | D. | clear skies |
|
|
|
4.
|
A shield volcano
A. | is sometimes called a stratovolcano. | C. | has gently sloping
sides. | B. | has a jagged surface. | D. | forms when lava erupts underwater. |
|
|
|
5.
|
A cinder cone volcano
A. | has gently sloping sides. | B. | is formed by explosive and nonexplosive
eruptions. | C. | erodes over thousands of years. | D. | has steep
slopes. |
|
|
|
6.
|
A combination of explosive and nonexplosive eruptions will create a
A. | shield volcano. | C. | cinder cone volcano. | B. | composite volcano. | D. | plateau
volcano. |
|
|
|
7.
|
A large depression that forms when the magma chamber partially empties is
a
A. | crater. | C. | caldera. | B. | rift. | D. | cinder cone. |
|
|
|
8.
|
Which of the following best describes subduction?
A. | movement of tectonic plates away from each other | B. | movement of one
tectonic plate against another | C. | movement of one tectonic plate under
another | D. | side-by-side movement of two tectonic plates |
|
|
|
9.
|
A vent or fissure in the Earth’s surface through which magma and gases are
expelled is called a(n)
A. | earthquake. | C. | volcano. | B. | magma chamber. | D. | vapor chamber. |
|
|
|
10.
|
Where are volcanoes most likely to form?
A. | near the center of continents | C. | along plate
boundaries | B. | along bodies of water | D. | in mountainous areas |
|
|
|
11.
|
Which of these would you expect to see during a nonexplosive eruption?
A. | giant fountains of lava and rock | C. | a mountainside caving
in | B. | clouds of ash darkening the sky | D. | huge lava flows |
|
|
|
12.
|
Molten rock deep underground often gathers in a
A. | vent. | C. | landslide. | B. | magma chamber. | D. | caldera. |
|
|
|
13.
|
Lava that is very runny probably
A. | has a low silica content. | C. | has been cooled below the
surface. | B. | is hotter than most lava. | D. | comes from explosive volcanoes. |
|
|
|
14.
|
If the water content of magma is high,
A. | a nonexplosive eruption is most likely. | B. | probably no eruption
will occur. | C. | an explosive eruption is more likely. | D. | then the temperature at its center is
low. |
|
|
|
15.
|
The pyroclastic material that can reach the upper atmosphere and circle the
Earth for years is
A. | pahoehoe lava. | C. | lapilli. | B. | aa lava. | D. | volcanic ash. |
|
|
|
16.
|
The three main types of volcanoes are
A. | shield, pahoehoe, and vented. | C. | cinder cone, lapilli, and
caldera. | B. | cinder, cone, and composite. | D. | shield, composite, and cinder
cone. |
|
|
|
17.
|
The volcanoes of Hawaii and other places far from tectonic plate boundaries are
known as
A. | calderas. | C. | hot spots. | B. | mid-ocean ridges. | D. | viscous
volcanoes. |
|
|
|
18.
|
Which kind of volcanic eruption is most destructive?
A. | atmospheric | C. | pahoehoe | B. | explosive | D. | nonexplosive |
|
|
|
19.
|
Mount Rainier and Mount St. Helens are
A. | shield volcanoes. | C. | composite volcanoes. | B. | cinder cone volcanoes. | D. | calderas. |
|
Completion
Complete each
statement.
|
|
|
20.
|
When a magma chamber empties, a(n) ____________________ results.
|
|
|
21.
|
An opening in the Earth’s crust through which magma and gases are expelled
is called a(n) ____________________.
|
|
|
22.
|
Parts of tectonic plates that are located above mantle plumes are called
____________________.
|
|
|
23.
|
Molten rock found deep within the Earth is called ____________________.
|
Short Answer
|
|
|
24.
|
How are silica and water related to a volcano’s explosiveness?
|
Matching
|
|
|
Match each item with the correct statement below. A. | volcano | D. | vent | B. | lava | E. | ash | C. | magma | F. | pyroclastic material |
|
|
|
25.
|
molten rock underground
|
|
|
26.
|
magma that flows on the Earth’s surface
|
|
|
27.
|
dust-sized particles of hardened lava
|
|
|
28.
|
magma that is blasted into the air and hardens
|
|
|
29.
|
vent on Earth’s surface through which magma and gases are
expelled
|
|
|
30.
|
a crack or opening in the Earth’s crust
|