Multiple
Choice
Identify the letter of the choice that best completes the statement or answers the
question.
|
|
|
1.
|
A batholith is created when
____. a. | lava forms a thick sheet | b. | lava fills a
vent | c. | magma cools underground before reaching the
surface | d. | magma in a sill pushes up to form a rock
dome | | |
|
|
|
2.
|
A ____ often forms a mountain
when layers of lava and volcanic ash erupt and build up. a. | caldera | c. | dike | b. | volcano | d. | batholith | | | | |
|
|
|
3.
|
Kilauea in Hawaii is the
world's most ____ volcano. a. | dormant | c. | explosive | b. | active | d. | all of the above | | | | |
|
|
|
4.
|
One factor that determines
whether a volcanic eruption will be quiet or explosive is ____. a. | the number of cinder cones | b. | the height of the volcano's
vent | c. | the amount of water vapor and other gases trapped in the
magma | d. | the amount of tephra in the magma | | |
|
|
|
5.
|
The Soufriére Hills
volcano is an example of a ____volcano. a. | composite | c. | shield | b. | cinder cone | d. | Hawaiian | | | | |
|
|
|
6.
|
Devil's Tower in Wyoming is an
example of a ____. a. | caldera | c. | dike | b. | volcanic neck | d. | batholith | | | | |
|
|
|
7.
|
More than ____ of Earth's
volcanoes are currently active.
|
|
|
8.
|
Magma that squeezes into a
horizontal crack between rock layers and hardens is called a ____. a. | dike | c. | sill | b. | batholith | d. | volcanic neck | | | | |
|
|
|
9.
|
Magma that is squeezed into a
generally vertical crack that cuts across rock layers and hardens is called a ____. a. | dike | c. | sill | b. | batholith | d. | volcanic neck | | | | |
|
|
|
10.
|
If, after an eruption, the top
of a volcano collapses down, a ____ forms. a. | caldera | c. | crater | b. | vent | d. | volcanic neck | | | | |
|
|
|
11.
|
Differences in ____ cause a
volcanic neck to form. a. | eruptive
forces | c. | resistance to erosion | b. | water
content | d. | silica content | | | | |
|
|
|
12.
|
Basaltic magma produces
nonexplosive eruptions such as those at ____. a. | Mount St.
Helens | c. | Kilauea | b. | Mount
Pinatubo | d. | Mount Unzen | | | | |
|
|
|
13.
|
Paricutin, in Mexico, is a ____
volcano. a. | composite | c. | cinder cone | b. | shield | d. | hot spot | | | | |
|
|
|
14.
|
Soufriére Hills volcano,
in Montserrat, is a ____ volcano. a. | shield | c. | hot spot | b. | cinder cone | d. | composite | | | | |
|
|
|
15.
|
Silica-rich magma
____. a. | sometimes forms where Earth's plates are coming together and one plate is forced under
another | b. | produces explosive eruptions | c. | is thick and gas gets trapped, causing pressure to build up | d. | all of the above | | |
|
Matching
|
|
|
Match each statement with
the correct item below. a. | caldera | d. | composite
volcano | b. | batholith | e. | cinder cone volcano | c. | volcanic neck | f. | shield volcano | | | | |
|
|
|
16.
|
Devil's Tower,
Wyoming—hard magma core
|
|
|
17.
|
Soufriére Hills
volcano—one plate was forced beneath another
|
|
|
18.
|
Yosemite National Park granite
domes in California—exposed at Earth's surface by erosion
|
|
|
19.
|
Kilauea, Hawaii—quiet
lava flows
|
|
|
20.
|
Crater Lake in Oregon—the
top of a volcano collapsed down
|
|
|
21.
|
Paricutin, Mexico—pile of
ash and cinders
|
Completion
Complete each sentence or statement.
|
|
|
Figure 6F-1
|
|
|
22.
|
Figure 6F-1A is a(n)
______________________________. It is made of ________________________________________.
|
|
|
23.
|
Figure 6F-1B is a(n)
________________________________________. It is made of
________________________________________.
|
|
|
24.
|
Figure 6F-1C is a(n)
______________________________. It is made of ________________________________________.
|
|
|
25.
|
Two important factors that
control whether an eruption will be explosive or quiet are the amount of _________________________
and other gases and the amount of ____________________ in the magma.
|
|
|
26.
|
Magma is ____________________
dense than the rock around it, so it is forced ____________________ Earth's surface.
|
|
|
27.
|
Ash, lava, and
____________________ erupt from the crater of a volcano.
|
Short
Answer
|
|
|
28.
|
Why do volcanoes form at plate
boundaries and hot spots?
|