Which of the following factors helps determine whether a volcanic eruption will be violent or relatively quiet?
amount of dissolved gases in the magma
temperature of the magma
composition of the magma
all of the above
The particles produced in volcanic eruptions are called ____.
laccoliths
pyroclastic material
volcanic stocks
What feature is labeled A in Figure 10-1?
crater
magma chamber
vent
What type of volcano is illustrated in Figure 10-1? Hint: it is large, steep, has symmetrical sides, and has alternate layers of lava and pyroclastic material?
cinder cone
shield volcano
composite cone/stratovolcano
Which of the following plays a major part in determining the form of a volcano?
elevation above sea level
local soil type
magma composition
Which of the following is true about cinder cones?
They have very steep sides.
They are usually less than 300 meters high.
They often occur near other volcanoes
all of the above
A caldera is a ____.
violent volcanic explosion
large depression in a volcano
very large volcanic bomb
Magma forms when solid rock in the crust and upper mantle ____.
melts
crystallizes
vaporizes
The volcanic landforms at divergent ocean plate boundaries are ____.