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Risks of living near volcanoes (Pyroclastic Flows (⬆ density mixture of…
Risks of living near volcanoes
Landslides
Masses of rock & soil that
fall, slide
or flow under the
force of gravity
1) trigger
huge waves
and
tsunamis
if landslide slams into huge water bodies
2)
Block rives
and
cause floods
3)
Bury
property, farmland & ppl
Lahars
v, fast moving mud flow
cause by melting snow on a volcano/
interaction of pyroclastic material
with rain
stratovolcanoes oni
1)
Destroy
and cause death by
direct impact
2)
Buries
towns, property, agricultural land under volcanic sediments
3)
Blocks
streams and lakes
lead to
sudden surges
and
floods
E.G. Nevado del Ruiz (volcano)
Colombia, SA
ice capped
Armero (22,000)
30 m of mud
Pyroclastic Flows
⬆ density mixture of hot, dry rock fragments and hot gas that move away from vent at ⬆ speeds
My result from:
explosive
eruption of
rock
fragments
non explosive
eruption of
lava
when part of dome
collapses
down a steep slope
1) Rock fragments and boulders travel at
⬆ speeds
destroying
everything in its path
kills by
direct impact
2)
Extremely hot
rock and gas
cause
death and injury
to ppl & animal
who
inhale gas/burnt
frm pyroclastic flow
buried
under hot rock debris
3)
Burns
forests, farmland, property
4) May react wif
water/snow/ice to form lahars
Volcanic Gas
Magma contains
dissolved gases
that are released into the atmosphere during eruptions
Hydrogen fluoride
pollutes
lakes and streams when gas dissolves in water
reduces
the amount of
drinking water
pollutes grass
-
poisons
livestock
Hydrogen Chloride
irritates eyes
and
respiratory tract
causing respiratory problems
(asthma)
Lower global temp temporarily
Volcanic Ash
Cause
planes to be grounded
lack of visibility
slippery runways
planes are
unable to land
affects
tourism
and
trading
in the country
-resulting in
huge economic losses
and
inconvenience
for tourists
Bury
farmland and property under layers of ash
Respiratory problems
for humans esp those with asthma
Volcanic bombs
Heated rock is
blasted into the air/
carried upwards by
hot gases
in eruption columns
Range in size from
small pebbles
to
large boulders
Fly out frm crater at ⬆ speeds
cause
damage to properties
in areas surrounding volcano
kills by
direct by impact
Lava
Streams of molten rock that pour frm an erupting vent
1)
flows over
agricultural lands
and
properties
,
burying
it
2)
Cld block
evacuation routes
3)
may react with
water
/
collapsing material
to form other
hazardous flows
e.g. wif water to form
lahars