19
ACID RAIN: CAUSES
ACID RAIN: CAUSES
A paradise island: which one is it?
Limestone and marble
dissolve in acid rain.
Welcome to
HAWAII.
This forest in Hawaii has been
damaged by acid rain.
But in Hawaii there are not many
factories, not even many cars.
What causes the
acid rain in
HAWAII then?
The most active
volcanoes on
Earth are in
Hawaii.
Volcanoes, as well
as factories and
cars, emit the
gases that produce
the acid rain.
Which are the gases
that produce acid rain?
Sulphur
dioxide
SO2
Which are the gases
that produce acid rain?
Nitrogen
dioxide
NO2
Reactions that lead to
acid rain
SO2 + air SO3
SO3 + H2O H2SO4
4 NO2 + 2 H2O + O2 4 HNO3
Sulphuric acid and nitric
acid, mixed with water,
make acid rain.
