Download Earthquakes and Volcanoes

 What is the difference between the Ring of Fire and a
hot spot?
 Compare and contrast the 3 types of volcanoes.
 Describe at least 4 volcano hazards.
 Compare volcanoes that form at divergent boundaries
to those that form at convergent boundaries.
Vocabulary
 Ring of Fire
 A major belt of
volcanoes that ring the
outer edge of the
Pacific Ocean.
Vocabulary
 Ring of Fire
 A major belt of
volcanoes that ring the
outer edge of the
Pacific Ocean.
Vocabulary
 hot spot
 An area where magma
from deep within the
mantle melts through
the crust above it.
 Hot spot volcanoes can
form at plate
boundaries or in the
middle of tectonic
plates.
Vocabulary
 hot spot
 An area where magma
from deep within the
mantle melts through
the crust above it.
 Hot spot volcanoes can
form at plate
boundaries or in the
middle of tectonic
plates.
Vocabulary
active volcano
 A volcano that is
currently erupting or
likely to erupt again.
Vocabulary
active volcano
 A volcano that is
currently erupting or
likely to erupt again.
Vocabulary
dormant volcano
 A volcano that is not
currently active, but
may become active in
the future.
Vocabulary
dormant volcano
 A volcano that is not
currently active, but
may become active in
the future.
Eyjafjallajökull
Vocabulary
extinct volcano
 A volcano that is no
longer active and is
unlikely to erupt ever
again.
Vocabulary
extinct volcano
 A volcano that is no
longer active and is
unlikely to erupt ever
again.
Notes: Volcanoes
Volcanoes can be classified as constructive OR
deconstructve.
Explosive volcanoes usually shrink in size.
Nonexplosive volcanoes usually grow.
Magma that contains more silica will create an
explosive volcano – the silica makes the magma
thicker, so it does not flow easily.
Notes: Volcanoes
Volcano hazards:
 lava
 ash
 rock
 lava bomb
 sulfur dioxide
 lahar
 pyroclastic flow
Other important terms:
 Crater – funnel shaped pit
 Caldera – material is
released, then volcano top
collapses
 Magma chamber
Notes: Volcanoes at Plate Boundaries
A. Diverging Boundaries
1.
2.
3.
Volcanoes form at mid-ocean ridges
where magma pushes up between
plates.
Volcanoes form at diverging plate
boundaries on land.
Examples: Mid-Atlantic Ridge and
Great Rift Valley
Notes: Volcanoes at Plate Boundaries
A. Converging Boundaries
Volcanoes form where two oceanic plates
collide. A subduction zone is formed and the
material from the melted plate rises, forming
a volcano on the ocean floor.
2. Volcanoes form where an oceanic plate is
subducted beneath a continental plate. The
material from the melted plate rises, forming
mountains and volcanoes on land.
3. Examples: Andes Mts. and island arcs in
Japan
1.