Download Volcanic

Volcanic Activity:
What causes a
volcano?
What is a volcano?

The hot upper mantle part of the
lithosphere escaping through the crust
part of the lithosphere.
Where are volcanoes?

Subduction zones: Where one plate is
pushed under another plate.
Where are volcanoes?


Subduction zones: Where one plate is
pushed under another plate.
Divergent zones: two plates pulling apart
and creating ridges.
Where are volcanoes?



Subduction zones: Where one plate is
pushed under another plate.
Divergent zones: two plates pulling apart
and creating ridges.
Hot spots: These can happen anywhere on
the planet that the crust is weak and thin
(even in the middle of a plate).
Volcano vocabulary:

Magma: Melted mantle beneath the surface
of the Earth.
Volcano vocabulary:


Magma: Melted mantle beneath the surface
of the Earth.
Lava: Magma that reaches the surface and
is exposed to the atmosphere.
Volcano vocabulary:



Magma: Melted mantle beneath the surface
of the Earth.
Lava: Magma that reaches the surface and
is exposed to the atmosphere.
Vent: The path gas and magma use to
escape the crust.
Types of eruptions:

Explosive: Happen when magma gets very
thick from high Silica content and contains
deadly gases.
Types of eruptions:

Explosive: Happen when magma gets very
thick from high Silica content and contains
deadly gases.
–
Pyroclastic flow: A mixture of hot gases (up to
800 degrees Celsius), ash, cinder, and bombs
hurled from a volcano at speeds up to 200 km
per hour.
Types of eruptions:

Explosive: Happen when magma gets very
thick from high Silica content and contains
deadly gases.
–

Pyroclastic flow: A mixture of hot gases (up to
800 degrees Celsius), ash, cinder, and bombs
hurled from a volcano at speeds up to 200 km
per hour.
Effusive: Dominated by lava flowing from
the volcano onto the ground.
Types of volcanoes:

Composite Volcanoes
Types of volcanoes:


Composite Volcanoes
Shield Volcanoes
Types of volcanoes:



Composite Volcanoes
Shield Volcanoes
Cinder Cones
Types of volcanoes:




Composite Volcanoes
Shield Volcanoes
Cinder Cones
Spatter Cones
Types of volcanoes:





Composite Volcanoes
Shield Volcanoes
Cinder Cones
Spatter Cones
Complex Volcanoes