Download FORMS OF ERUPTIONS

FORMS OF ERUPTIONS
Chapter 8, Section 2
Friday, April 29, 16
Friday, April 29, 16
Volcanoes can cause great destruction. Volcanoes also
add new rock to Earth’s crust with each eruption.
Friday, April 29, 16
Volcanoes can cause great destruction. Volcanoes also
add new rock to Earth’s crust with each eruption.
Different types of eruption produce different types of
volcanoes.
Friday, April 29, 16
WHAT DETERMINES HOW A
VOLCANO ERUPTS?
Friday, April 29, 16
WHAT DETERMINES HOW A
VOLCANO ERUPTS?
The composition of the magma plays a big part in
determining the manner in which energy is released
during a volcanic eruption.
Friday, April 29, 16
WHAT DETERMINES HOW A
VOLCANO ERUPTS?
The composition of the magma plays a big part in
determining the manner in which energy is released
during a volcanic eruption.
Other factors that determine the force of an
eruption:
Friday, April 29, 16
WHAT DETERMINES HOW A
VOLCANO ERUPTS?
The composition of the magma plays a big part in
determining the manner in which energy is released
during a volcanic eruption.
Other factors that determine the force of an
eruption:
Amount of water vapor and other gases
Friday, April 29, 16
WHAT DETERMINES HOW A
VOLCANO ERUPTS?
The composition of the magma plays a big part in
determining the manner in which energy is released
during a volcanic eruption.
Other factors that determine the force of an
eruption:
Amount of water vapor and other gases
Its temperature
Friday, April 29, 16
WHAT DETERMINES HOW A
VOLCANO ERUPTS?
The composition of the magma plays a big part in
determining the manner in which energy is released
during a volcanic eruption.
Other factors that determine the force of an
eruption:
Amount of water vapor and other gases
Its temperature
Silica content
Friday, April 29, 16
WHAT DETERMINES HOW A
VOLCANO ERUPTS?
The composition of the magma plays a big part in
determining the manner in which energy is released
during a volcanic eruption.
Other factors that determine the force of an
eruption:
Amount of water vapor and other gases
Its temperature
Silica content
Friday, April 29, 16
Friday, April 29, 16
How the composition of magma affects eruptions
High silica
Low silica
Consistency
and flow
Thick and resistant to
flow
less thick, flows
easily
Lava colored
Light
Dark
Types of rocks
produced
Obsidian
Pumice
Basalt
Eruption
Violent
Quiet
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TYPES OF ERUPTIONS
Friday, April 29, 16
TYPES OF ERUPTIONS
A quiet eruption is when the lava
flows easily
Friday, April 29, 16
TYPES OF ERUPTIONS
A quiet eruption is when the lava
flows easily
Pahoehoe is a hot, fast moving
type of lava that hardens to
form smooth, ropelike coils.
Friday, April 29, 16
TYPES OF ERUPTIONS
A quiet eruption is when the lava
flows easily
Pahoehoe is a hot, fast moving
type of lava that hardens to
form smooth, ropelike coils.
Aa is a slow-moving type of lava
that hardens to form rough
chunks
Friday, April 29, 16
TYPES OF ERUPTIONS
A quiet eruption is when the lava
flows easily
Pahoehoe is a hot, fast moving
type of lava that hardens to
form smooth, ropelike coils.
Aa is a slow-moving type of lava
that hardens to form rough
chunks
Mount Kilauea is a volcano that is
common for quiet eruptions
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Friday, April 29, 16
An explosive eruptions happens if its magma is thick
and sticky
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An explosive eruptions happens if its magma is thick
and sticky
it slowly builds up in the volcano’s pipe
Friday, April 29, 16
An explosive eruptions happens if its magma is thick
and sticky
it slowly builds up in the volcano’s pipe
The trapped gases build up pressure until they
explode.
Friday, April 29, 16
An explosive eruptions happens if its magma is thick
and sticky
it slowly builds up in the volcano’s pipe
The trapped gases build up pressure until they
explode.
When the volcano erupts, it can release a
pyroclastic flow, gases, ash, cinders, and bombs from
the top of volcano.
Friday, April 29, 16
An explosive eruptions happens if its magma is thick
and sticky
it slowly builds up in the volcano’s pipe
The trapped gases build up pressure until they
explode.
When the volcano erupts, it can release a
pyroclastic flow, gases, ash, cinders, and bombs from
the top of volcano.
1980’s eruption of Mt. St. Helen is an example
Friday, April 29, 16