1587062
Description
Mind Map by 013freemanm, updated more than 1 year ago
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Created by 013freemanm
about 10 years ago
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Volcanic Eruptions
- Ashfall
- What is Ashfall?
- ashfall is 'ash'
fallen from the
erupting volcano
that has been
stored in the vent
- ashfall is 'ash'
fallen from the
erupting volcano
that has been
stored in the vent
- What are the dangers?
- can cause harm
when in the areas,
can cause illness,
coughing
- ash get into the lungs
- some cases it can
cause death
- ash get into the lungs
- can cause harm
when in the areas,
can cause illness,
coughing
- What is Ashfall?
- Pyroclasticflow
- What is Pyroclastic Flow?
- Highly dense mixture of hot,dry
rock fragments and hot gases
that move away from the vent
once it's erupted at high speeds
- Highly dense mixture of hot,dry
rock fragments and hot gases
that move away from the vent
once it's erupted at high speeds
- How fast does it travel?
- Rock fragments ranging in size from ash
to boulders travel across the ground at
speeds greater than 80km per hour
- Rock fragments ranging in size from ash
to boulders travel across the ground at
speeds greater than 80km per hour
- How far does it travel?
- can flow 50 kilometres from source
- can flow 50 kilometres from source
- How hot is it?
- pinatubo - 750 degrees C
- pinatubo - 750 degrees C
- Case study Example
- Mt Pinotoba (Philippines)
- How many times has it erupted?
- Has had at least 6 periods of
activity with large explosions
in it's 35,000 years.
- Has had at least 6 periods of
activity with large explosions
in it's 35,000 years.
- How many times has it erupted?
- Mt Pinotoba (Philippines)
- What is Pyroclastic Flow?
- Lahars
- what are Lahars?
- they are a hot or cold
mixture of water and rock
fragments flowing down the
volcano
- How far/fast do they travel?
- small fragments of rck can
travel a few metres per
second, but a large lahar can
flow tens of metres per
seconds - too fast for people
to out run
- small fragments of rck can
travel a few metres per
second, but a large lahar can
flow tens of metres per
seconds - too fast for people
to out run
- How far/fast do they travel?
- they are a hot or cold
mixture of water and rock
fragments flowing down the
volcano
- Case study
- Nevado Del Ruiz
- central Colombia
- small eruption - 1985
- resulted in mud
flow, killing
25,000 people in
the town of
Armero
- resulted in mud
flow, killing
25,000 people in
the town of
Armero
- covers more
200 squared km
its summit
contains the
1-km wide and
240m deep
arenas crater
- central Colombia
- Nevado Del Ruiz
- what are Lahars?
- Gasses
- Definition
- small particles
released into the
atmosphere
which has been
made in the
volcano
- small particles
released into the
atmosphere
which has been
made in the
volcano
- cases study
- Lak Ngos
- in Camaroon
- estimated
release of co2 -
0.68km3 (up to 1
km3)
- gas killed all living
things within 15mile
radius of the lake
- in Camaroon
- Lak Ngos
- Definition
- Global Warming
- What is Global warming?
- global warming is
the amount of
exposed co2 gases
in the atmosphere,
slowly absorbing
the suns raise
- global warming is
the amount of
exposed co2 gases
in the atmosphere,
slowly absorbing
the suns raise
- Case study
- St Helens
- USA
- USA
- St Helens
- How dangerous is it?
- long term its dangerous....
- causing ice caps to melt
- temperatures to rise
- causing ice caps to melt
- long term its dangerous....
- What is Global warming?
- Lava Flow
- What is Lava flow?
- are streams of
molten rock that
pour from an
erupting vent
they destroy
everything in its
path
- are streams of
molten rock that
pour from an
erupting vent
they destroy
everything in its
path
- How far does it travel?
- can move
away as
4km from
source
- can move
away as
4km from
source
- how fast does it travel?
- 10km/hour
- 10km/hour
- What is Lava flow?
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