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Air pollution
The presence in or introduction into the air of a substance which has harmful or poisonous effects.
Ozone layer
A layer in the stratosphere that contains a concentration of ozone sufficient to block most ultraviolet radiation from the sun.
Global warming
An increase in the average temperature of the earth's atmosphere.
Fractional distillation
Separation of a liquid mixture into fractions differing in boiling point.
pH of water
It also reduces ________ bodies and soil, harming aquatic and plant life.
Pollutants
Substances or chemicals that cause pollution.
Acid raid
Rainfall made so acidic by atmospheric pollution that it causes environmental harm.
Carbon cycle
Series of processes by which carbon compounds are interconverted in the environment.
Note 
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