Types of Volcanoes Guided Notes
page 480
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 What is the relationship between craters, calderas, vents, and
magma?
Craters are the depressions in the tops of volcanoes, and they are
connected to the magma reserves underground by vents.
Calderas are what form when land collapses into a magma
chamber.
 How does a crater lake form? (words and pictures)
The magma chamber under a volcano collapses, leaving a large
depression or bowl on the Earth’s surface. When this bowl fills
with water it makes a crater lake.
 What two factors does a volcano’s appearance depend upon?
The type of material the volcano is formed out of and the type of
eruptions that occur.
Types of Volcanoes Guided Notes
page 480
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What characteristics vary among volcanoes?
Shape, size, and composition.
Complete the following table in your notes:
Type of
Materials Sketch
Volcano
&
Descriptio
n
Shield
Formed
when
layers of
balsastic
lava pile
on top of
one
another.
They have
wide,
gently
sloped
sides.
Cinder-Cone
Formed
when
materials
ejected
high into
the sky
from
volcanoes
return to
the
Exampl
e
Mauna
Loa in
Hawaii
Izalco
volcano
in El
Salvado
r
Types of Volcanoes Guided Notes
page 480
Do not write on this copy. Transfer the questions into your notebook in Cornell style and use your book to find the answers.
surface
and pile
up. They
have
steep
sides and
are
usually
small.
Composite
(Stratovolcan
o)
Formed
when
layers of
volcanic
fragments
alternate
with lava.
They are
extremely
large and
explosive.
Mt. St.
Helens
 How do the volcanoes compare in terms of size and slope?
Composite are the largest followed by shield cone and then cinder
cone. Composite and cinder cone both have concave slopes and
shield cone has straight slopes.
 What factors cause differences in size and slope?
Different materials that make up the volcano, the vegetation on
the slope, the climate, and the eruption history
Types of Volcanoes Guided Notes
page 480
Do not write on this copy. Transfer the questions into your notebook in Cornell style and use your book to find the answers.
 What is tephra?
Tephra is rock thrown into the air by volcanic eruptions
 What is a pyroclastic flow?
Rapidly moving volcanic material including gas, ash and tephra.
 Where are most volcanoes found?
Most of them are found at plate boundaries.
Use the maps provided to show: (1) the Circum Pacific Belt and the
Mediterranean Belt where convergent volcanism occur and (2) the
Hawaiian Emperor Volcanic Chain.
 How do hotspots form?
They are formed when mantle comes close to the surface
 What do hotspots tell us about tectonic plates?
They tell us plate direction and motion
Circum Pacific and Mediterranean
Volcanic Belt
Hawaiian Emperor Volcanic Chain