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
Organize the following tephra from largest to smallest in size
dust
bombs
ash
blocks
Multiple Choice
If the debris within a landslide mixes with enough water it can trigger which of the following volcanic hazards
a tsunami
a tidal wave
a lahar
Most of the active volcanoes on Earth are located in a belt known as the ____.
circum-Atlantic belt
Ring of Fire
East African Rift Valley
The volcanic landforms at divergent ocean plate boundaries are ____.
oceanic ridges
continental volcanic arcs
volcanic island arcs
Most shield volcanoes have grown from the ocean floor to form ____
islands
tectonic plates
laccoliths
Magma forms when solid rock in the crust and upper mantle ____.
melts
crystallizes
cools
A caldera is a ____.
large depression in a volcano
violent volcanic explosion
very large volcanic bomb
The most violent volcanic eruptions are associated with what type of volcano?
cinder cones
shield volcanoes
composite
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
ll of the above
Which of the following plays a major part in determining the form of a volcano?
elevation above sea level
local soil type
magma composition
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?
volcanic neck
shield volcano
composite cone
What feature is labeled A in Figure 10-1?
magma chamber
crater
volcanic neck
The broad, slightly dome-shaped volcanoes of Hawaii are ____.
composite cone volcanoes
shield volcanoes
pyroclastic volcanoes
The particles produced in volcanic eruptions are called ____.