Download Name

Name _____________________________________ Date _________________ Per. _____
Volcano Review WS
I.
II.
III.
What happened? Match the description to each volcano eruption.
a. Crater Lake occurred after explosion
____ Mt. Vesuvius
b. Sudden death by pyroclastic flow
____ Kratatoa
c. Renewed volcanic activity in 1980
____ Mt. Mazama
d. Buried Pompeii
____ Mt. St. Helens
e. Heard ‘round the world
____ Mt. Pelee
What is it? Match the description to each pyroclastic object.
a. Pumice
____ shiny volcanic glass
b. Phenocryst
____ Full of holes, like swiss cheese
c. Obsidian
____ Spindle or lens-shaped
d. Bomb
____ Hardened, frothy volcanic glass
e. Vesicular basalt
____ Large crystal in porphyritic rock
True or False.
a. ____ Geologists believe that Honolulu will be devastated by pyroclastic flows.
b. ____ Cinder cones are usually steeper than stratovolcanoes.
c. ____ Pillow structure is regarded as an indication of submarine eruptions.
d. ____ Volcanic gas released during eruptions is mainly steam.
e. ____ Pieces of pumice that can float are believed to contain pulverized wood ash.
f. ____ Lava fountains create cinder cones.
g. ____ Volcanic rocks that have a high silicate content are generally light colored.
h. ____ The viscosity of lava determines how easily it can flow and release gas.
i. ____ Most extrusive igneous rocks are fine-grained.
j. ____ The most abundant felsic extrusive rock is andesite.
k. ____ Obsidian is noncrystalline
IV.
Volcano Profiles. Match the letters of the sketches below with the appropriate
choices. Use choices more than once.
A
B
C
D
____ stratovolcano
____ generally steepest
____ cinder cone
____ mostly felsic lava
____ shield volcano
____ mostly mafic lava
____ volcanic (lava) dome
____ mostly intermediate lava
____ mostly convex slopes
____ most likely explosive eruptions
____ mostly concave slopes
____ mainly low-viscosity lavas
____ built mostly of pyroclasts
____ mainly andesitic rocks
____ made of lava & pyroclasts
____ mostly basaltic rock
____ smallest volcano type
____ mostly rhyolitic rock
____ largest (widest) volcano
____ tallest volcano
V.




Label the features in the diagram. Use each label only once.
Ash/gas cloud
 Feeder conduit
 Subsidiary cone
Ash layer
 Flank eruption
 Vent
Stratovolcano
 Lava layer
 Crust
Crater
 Magma chamber
Type of Volcano:___________________
VI.
Multiple Choice. Choose the best answer.
a. ____Which of the following minerals (except in minor amounts) would NOT be
associated with a very explosive volcano?
i. Feldspar
iii. Olivine
ii. Quartz
iv. Muscovite
b. ____Which of the following phrases in NOT likely to be used in describing
volcanoes?
i. Very small to very large in size
ii. May be conical shaped
iii. Built up over preexisting rocks
iv. Made of mainly dense-textured rocks
v. Composed of intrusive rocks
VII.
Describe each of the following terms:
a. Volcanic ash/tuff b. Volcanic bombs c. Tephra d. Lahar e. Lapilli f. AA g. Pahoehoe -