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 the relationship between craters, calderas, vents, and
magma? Magma comes out of the vents which are connected to
the crater. Calderas are really just bigger craters.
 How does a crater lake form? (words and pictures)When the side
of a volcano collapses onto the magma chamber making a caldera.
The caldera eventually filled up with water to form a lake.
 What two factors does a volcano’s appearance depend upon?
Material that forms the volcano and what erupts.
 What characteristics vary among volcanoes? Size, shape, and
composition.
Complete the following table in your notes:
Type of
Materials &
Sketch
Example
Volcano
Description
Gently sloping
Shield
Mauna Loa.
sides and circular
base. Form from
basaltic lava
layering up during
nonexplosive
eruptions.
Cinder-Cone
Steep sides and
normally small.
Form from
material shot into
the air that falls
back and piles up
near the vent.
Izalco
volcano, in
El Salvador.
Composite
(Stratovolcano)
Very dangerous and
much larger then
cinder-cones. Form
from volcanic
fragment layer
alternating with
lava.
Mount St.
Helens
Similar
Material
makeup
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.
 How do the volcanoes compare in terms of size and slope? Shield
volcanoes are the largest, and the smallest are the cinder-cone.
These cinder-cone volcanoes also have the steepest slope,
(concave), while shield volcanoes have a very gentle slope
(straight).
 What factors cause differences in size and slope? Material making
up the volcano, vegetation growing on the slope, climate, and
eruptive history.
 What is tephra? Rock fragments thrown in the air during volcanic
eruptions.
 What is a pyroclastic flow? Rapidly moving volcanic material from
an eruption.
 Where are most volcanoes found? 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? High temperature plumes of mantle
material rise towards the surface.
 What do hotspots tell us about tectonic plates? They can tell us
changes in plate motion, and the rate and direction of motion.
The Circum Pacific Belt is shown
in dark blue outline.
Hawaiian Emperor Volcanic Chain
is in here.
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.