Transcript Volcanoes Presentation Cornell Notes

Volcanoes
Mrs. Hoenshell
Objective: “I can define and give examples of
different volcanoes and how they are formed.
Essential Question:
What causes volcanoes?
How are volcanoes related to plate boundaries and
does a certain type of plate boundary have a different
kind of volcano? If so, what is the difference?
•What is a
volcano?
•What is a
volcano?
A volcano is a weak spot
on the Earth where
magma comes out
through the top of the
volcano.
Why do
volcanoes
form?
Volcanoes form because
magma rises through
openings called vents
caused by pressure that
builds up within the earth.
Most volcanoes form where
two plates meet.
Why do
volcanoes
erupt?
Hot, melted rock magma deep
within the earth becomes
lighter as it heats up.
Because it is lighter than
solid rock it rises until it
pushes to the surface of the
earth. A volcanic eruption
occurs!
Where do
volcanoes
erupt?
In the middle of the
earth’s plates,
hotspots, near the
edges of the earth’s
plates and subduction
and rift zones.
What is a
hotspot?
A hotspot is when
volcanoes form in the
middle of a tectonic plate.
What are
the 3 main
shapes of
volcanoes?
How are Shield volcanoes form when
shield
masses of lava slowly ooze
volcanoes out from an opening in the
formed?
earth’s crust, forming a
broad, gentle slope.
Shield
cones
form
What are the
from hot, runny lava
main
characteristics that is erupted slowly.
of shield
Shield cones are low,
volcanoes?
very broad, and gently
sloping volcanoes.
What is
the history
of shield
volcanoes?
Shield cones were
named by Icelandic
people because the
cone's shape reminded
them of a warriors shield
laid down.
Diagram a Shield Volcano
At what type
of plate
boundary
would you
find shield
volcanoes?
Hotspots
Mauna Loa, which is also on
the big island, is the largest
Where
are some volcano on Earth and the
tallest mountain in the
shield
volcanoes world if measured from the
located? floor of the ocean where it
was formed.
Where
are some
shield
volcanoes
located?
Mona Loa
What are
cinder cone
volcanoes?
A volcanic cone
built entirely of
loose
fragmented
material
pyroclastics.
Diagram a
cinder
cone
volcano.
Cinder
cones
are
commonly
At which
found on the flanks of
plate
boundary
shield volcanoes,
would you
stratovolcanoes
expect to
see a cinder (composite), and calderas.
cone
volcano?
Where are
some
cinder
cone
volcanoes
located?
Paricutin
What are
the main
characteris
tics of
composite
volcanoes?
Composite
volcanoes are
explosive. They
usually pyroclastic
flows that are very
destructive.
Diagram a
composite
volcano.
At which
plate
boundary
would you
expect to see
a composite
volcano?
Most composite
volcanoes are found
around the Ring of
Fire along the
subduction zones for
convergent plates.
Where are
some
composite
volcanoes
located?
Mt. Vesuvius,
Mt. Fujiyama,
and Mt. St.
Helens
Mt. Vesuvius
site of
Pompeii
Mt.
Fujiyama,
Japan
Mt. St.
Helens,
Washington
What is
the name
for a dead
volcano?
Give an
example
A dead volcano is a volcano
that has not erupted in
recorded history and shows no
signs of ever erupting.
Mt Hood in Oregon is an
example of an extinct volcano
What is
the name
for when
a sleeping
volcano?
A sleeping volcano is
dormant.
It is when a volcano
has not erupted
recently but has
erupted in recorded
history.
What is the
name for a
volcano
that has
recently
erupted?
A volcano that has
recently erupted is
active. Mauna Loa is
an active volcano.
The destruction from a
volcanic
eruption
is
What
caused by lava, ash and
causes
destructio gases in the air, water
n from a
and
rock
and
mud
slides
volcanic
eruption? called lahars.
Summary:
Review your notes and summarize the
information in your own words in 3-5 sentences.