1.
Today, people are never likely to be killed by a volcano.
2.
Volcanoes can form on the ocean floor.
3.
There is no relationship between plate tectonics and volcanoes.
4.
Gas trapped in magma under high pressure can cause explosive eruptions.
5.
Cinder cone volcanoes produce quiet eruptions.
6.
A batholith is created when _______________
A. 
B. 
C. 
Magma cools and solidifies underground before reaching the surface
D. 
Magma in a sill pushes up to form a rock dome
7.
A __________ is an opening in Earth that erupts gases, ash, and lava.
A. 
B. 
C. 
D. 
8.
Kilauea in Hawaii is the world's most _________ volcano.
A. 
B. 
C. 
D. 
9.
One factor that determines whether a volcanic erupton will be quiet or explosive is _________________.
A. 
The number of cinder cones
B. 
The height of the volcano's neck
C. 
The amount of water vapor and other trapped gases in the magma
D. 
The amount of tephra in the magma
10.
Devil's Tower in Wyoming is an example of a ____________________.
A. 
B. 
C. 
D. 
11.
In 1990, lava from ______________ covered most of a town in Hawaii.
A. 
B. 
C. 
D. 
12.
More than _______________ of Earth's volcanoes are currently active.
13.
Magma forms deep inside Earth because of _________________.
A. 
A rise in temperature and a drop in pressure
B. 
A drop in temperature and a rise in pressure
C. 
A rise in temperature and increase in pressure
D. 
A drop in temperature and a drop in pressure
14.
Some volcanoes form islands as __________ flows from the rifts in the seafloor and builds up high enough to break the ocean's surface.
A. 
B. 
C. 
D. 
15.
Magma that squeezes into a horizontal crack between rock layers and hardens is called a __________
A. 
B. 
C. 
D. 
16.
Magma that is squeezed into a crack that cuts across rock layers vertically and hardens is called a ___________.
A. 
B. 
C. 
D. 
17.
If, after an eruption, the top of a volcano collapses down, a __________ forms.
A. 
B. 
C. 
D. 
18.
Differences in _______________ cause a volcanic neck to form.
A. 
B. 
C. 
D. 
19.
Most of the rock in Yosemite National Park is an exposed _________________.
A. 
B. 
C. 
D. 
20.
Basaltic magma produces nonexplosive eruptions such as those at ___________________.
A. 
B. 
C. 
D. 
21.
A steep walled depression around a volcano's vent is called a _______________.
A. 
B. 
C. 
D. 
22.
Parcutin, in Mexico, is a __________________ volcano.
A. 
B. 
C. 
D. 
23.
Soufriere Hills volcano, in Montserrat, is a ______________ volcano.
A. 
B. 
C. 
D. 
24.
Silica rich magma______________
A. 
Can form at subduction zones
B. 
Produces explosive eruptions
C. 
Is thick and gas gets trapped, causing pressure to build up
D. 
25.
____________ magma is silica poor and causes quiet, nonexplosive eruptions.