acid rain causes and effects - xtecateneu.xtec.cat/.../clsa/modul_4/acid_rain_-_causes... · that...
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ACID RAIN
CAUSES and EFFECTS
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A paradise island: which one is it?
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Limestone and marble
dissolve in acid rain.
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Welcome to
HAWAII.
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This forest in Hawaii has been
damaged by acid rain.
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But in Hawaii there are not many
factories, not even many cars.
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What causes the
acid rain in
HAWAII then?
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The most active
volcanoes on
Earth are in
Hawaii.
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Volcanoes,
together with
factories and cars,
emit the gases
that produce the
acid rain.
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Which are the gases
that produce acid rain?
Sulphur
dioxide
SO2
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Which are the gases
that produce acid rain?
Nitrogen
dioxide
NO2
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Reactions that lead to
acid rain
SO2 + air SO3
SO3 + H2O H2SO4
4 NO2 + 2 H2O + O2 4 HNO3
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Sulphuric acid and nitric
acid, mixed with water,
make acid rain.
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What are the
effects of
acid rain?
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Acid rain damages buildings.
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Limestone and marble
dissolve in acid rain.
WHY?
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limestone marble
CaCO3 calcium carbonate
are made from
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CaCO3 calcium carbonate
H2SO4 sulphuric acid
+
CaSO4 calcium sulphate
H2O water
+ CO2 carbon dioxide
+
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Acid rain kills
trees.
WHY?
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When acid rain
reaches the
ground, it
dissolves some
of the minerals
and carries
them away. This
process is
called leaching.
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Without these
minerals, trees
can die.
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Acid rain kills
fish in lakes.
WHY?
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Many forms
of water life
are sensitive
to the pH of
the water. If
the pH
changes, they
can die.
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Fish die
because they
don’t have
food to eat.
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