Any unwanted and undesirable change
in the environment that affects the atmosphere and disturbs the ecosystem is
called pollution.
Major types of pollution are, (1) air pollution (2) Water pollution (3) Soil pollution (4) Noise pollution
Pollution began to be recognized as a series threat during the industrial
revolution of the 19th century.
Sulphur dioxides(SO2), Oxides of Nitrogen (NO2,
NO), Carbon monoxides (CO), and Chlorofluorocarbons
(CFCs), are main pollutants, of environment.
Chlorofluorocarbons (CFCs) are nontoxic, nonreactive chemicals. They
are the major cause of breakdown of ozone layer, allowing more ultra
violet light to reach the earth.
CFCs are used as aerosol spray, as cooling agent in
refrigerators and air conditioners, and in form of packing.
CO2, CH4,
and other gases absorb infrared radiation and reflect it back to land causing
increase In average temperature of environment. This is called Greenhouse
effect. OR
The solar radiation enters the earth atmosphere and reaches the earth
surface. Some of the solar radiation is absorbed by the earth surface while the
remaining re-radiated in to the atmosphere. The large amounts of CO2
in the atmosphere blocks and absorb the outgoing radiation causing heating of
earth. This is called greenhouse effect.
The formation of acid in rain-water by its mixing with pollutants like SO2,
CO2, andNO2, is called acid
rain.
When the above gases dissolved in rain water, they make their acids, H2SO4
and HNO3 respectively.
Removal of the forests for human use is called deforestation. Deforestation
Deforestation causes many problems like Soil erosion, Green House
effect, and air pollution.
Coal power plants are one of the large contributors to polluting
earth.
Protecting natural resources is called conservation. Effects of carbon monoxide
Effects of carbon monoxide are damage to central nervous system,
heart, respiratory problem, nausea and dizziness etc.
Effects of Sulpur dioxide are eye, nose, throat, and lung
cancer etc.
Which of the following is not a
greenhouse gas
a) Methane
b) Carbon dioxide
c) Hydrogen
d) Nitrous oxide
