Chapter 6 Volcanoes
Review Game
Rules
Coin toss for 1st question
Team will answer the question, random
selection
Correct answer gets the team a point
Wrong answer gives the other team a
chance to steal- random choice
Team with highest score gets 5 bonus
points for the test
1) Define Volcano
A weak spot in the
crust where molten
material comes to the
surface
2) What is the ring of
fire?
A major volcanic belt
that rims the Pacific
ocean
3) Explain how
volcanoes form at
converging plate
boundaries.
Subduction forces crust into the mantle
where it melts, rises, and breaks
through the crust
4) Explain what a
“hot spot” is.
Magma melts through the crust
like a blowtorch
5) Give an example of
a hot spot volcano that
formed on oceanic
crust.
Hawaii
6) Give an example of
a hot spot volcano that
formed on continental
crust.
Yellowstone
7) What is an island
arc?
A string of volcanic
islands along an
oceanic plate boundary
8) What process
forms an island arc?
When an oceanic plate
subducts under another
oceanic plate, melts, rises
forming island volcanoes
9) Why does magma
rise?
Liquid magma is less
dense than the
surrounding rock and
flows upwards into cracks
10) What is a magma
chamber?
As magma rises to the
surface it forms a large
underground pocket
11) What does a
“pipe” in a volcano
do?
A crack in the crust where
magma reaches the
surface
12) What is a Volcano
vent?
A point on the surface
where magma leaves a
volcanic pipe
13) What is a lava
flow?
The river of lava that
pours down a
volcano
14) What is a crater?
The bowl shaped
area that forms
around the main vent
15) What 2 factors
effect how thick or
fluid a volcano’s
magma is?
Temperature and silica
content
16) What is
pahoehoe lava?
Fast moving hot
flowing lava
17) Describe aa
lava
Lava that is cooler and
slower moving made
up of jagged lava
18) What determines if
a volcanic eruption is
quiet or explosive?
The more silica content in the
magma, the more trapped
gases, the cooler the lava.
19) What is a
pyroclastic flow?
An explosive eruption hurling
out ash, cinders, bombs, and
gases
20) What are the 3
stages of a volcano?
Active, dormant, and
extinct
21) How is a hot spring
or geyser a form of
volcanic activity?
A body of magma
(geothermal energy) is
heating the water of a hot
spring or geyser
22) What are some of
the ways geologists
monitor volcanoes?
Tiltmeters, laser ranging devices,
local magnetic field, water levels in
the crater, escaping gases, and
temperature
23) Describe volcano
hazards from a quiet
eruption
Lava flows from an
eruption can burn
everything in its path.
24) Describe volcano
hazards from an
explosive eruption
Volcanic ash can bury
entire towns, damage
crops etc.
25) What is a volcanic
neck, dike, & sill?
Neck- magma hardens in a pipe
DikeHardened magma that forced its way
across layers of rock
Sill- Magma squeezes between layers
of rock
26) What is a
batholith?
A large magma body
that cools within the
crust
27) What is a shield
volcano?
Lava flows gradually
build a wide gently
sloping mountain
28) What is a
composite volcano?
Lava flows alternating with
eruptions of ash, cinders,
and bombs form a tall
cone shaped volcanoe
29) What is a cinder
cone volcano?
Ash, cinders, and bombs
build up around the main
vent in a steep cone
shaped pile
30) What is a caldera
volcano?
The huge hole that is left
from the collapse of a
volcano’s main chamber
31) What is a lava
plateau?
Floods of lava build up in
layers forming a plateau