Page 137 - Genius Kidz Prudence Learning Sc-8

"Acid deposition" is the more correct CaCO + H SO ¾® CaSO + CO + H O
3 2 4 4 2 2
word to be used to refer to acid rain, Acid rain is very much hazardous to us
acid snow, etc. too as acidification of soil can result in

Harmful effects of acid rain : release of toxic metals from soil that
Acid rain increases the acidity of rivers, ultimately reach our water supplies.

lakes and streams that is, in turn Toxic metals can cause cold, allergies,
threatening aquatic life. coughs, etc.
Acid rain falling on to the vegetation can Oxides of sulphur (SO) : They are released
x
kill it directly. due to combustion of fossil fuels, volcanic
erruptions, etc.
Damage to buildings and our sculptrous
material is one of the dangerous effects Effect :
of acid rain. Sulphuric acid present in the (a) Acid rain : As it is already discussed,
acid deposition reacts with calcium of sulphur dioxide combines with rainwater

limestone, marble, sand stone and to form sulphuric acid to form acid rain.
granite to form yellow gypsum that (b)Sulphur dioxide also lays down
flakes off later. damaging effects on plants and

animals.
(c)Damages buildings and sculptrous
materials.

Freons or Chlorofluoro Carbons (CFC) :
CFC’s are the gases released from aerosol
sprays, refrigerating equipments, etc. They
are made up chlorine and fluorine. CFC’s
are responsible for ozone layer depletion.

Lead : Lead is the air pollutant discharged
from vehicular emissions, paint industries
and from lead batteries. It can cause several
human health problems like nervous
disorders, digestive discomfort and

respiratory illness, etc.
Diagrammatic representation of Acid rain
Suspended particulate matter (SPM) : SPM

Ozone layer depletion : 90 % of the ozone is present in the stratophere of the atmosphere and only 10% is in the
troposphere. Stratospheric ozone protects us from the harmful UV radiation of sun. Whereas tropospheric ozone
acts as an environmental pollutant. Depletion of stratospheric ozone is caused by fluro or chloro fluro carbons, nitric
oxide, hydroxy radicals and oxygen.
Effects of depletion of Ozone Layer : Due to depletion of ozone layer our earth is getting more and more exposed to
UV radiation.
UV radiation can cause blindness and cancer.
As ozone is a greenhouse gas so it can also lay a pronounced impact on surrounding climate.

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