1
-
Burning
of
____________________
.
2
-
Production
of
chemicals
3
-
Reaction
of
polluting
gases
____________________
water
in
clouds
.
4
-
Formation
____________________
sulphuric
____________________
nitric
acids
.
5
-
The
____________________
falls
as
acid
rain
.
6
-
Damage
to
the
environment
.
