Ciencias En Ingles

AIR POLLUTION
Air pollution includes all contaminants found in the atmosphere. These dangerous substances can be either in the form of gases or particles like, Car emissions, chemicals fromfactories, dust, pollen and mold spores may be suspended as particles. But there are different kinds of pollution—some visible, some invisible—that contribute to global warming. Generally any substancethat people introduce into the atmosphere that has damaging effects on living things and the environment is considered air pollution.
CAUSES:
There are many different chemical substances thatcontribute to air pollution. These chemicals come from a variety of sources. Among the many types of air pollutants are nitrogen oxides, carbon monoxides, and organic compounds that can evaporate and enterthe atmosphere.
Air pollutants have sources that are both natural and human. Now, humans contribute substantially more to the air pollution problem. Forest fires, volcanic eruptions, wind erosion,pollen dispersal, evaporation of organic compounds, and natural radioactivity are all among the natural causes of air pollution.
SMOG is caused by chemical reactions between pollutants derived fromdifferent sources, primarily automobile exhaust and industrial emissions.
The acid rain occurs when a pollutant, like sulfuric acid combines with drops of water in the air, the water (or snow) canbecome acidified.
The Greenhouse Effect, is generally believed to come from the build up of carbon dioxide gas in the atmosphere. Carbon dioxide is produced when fuels are burned.
Ozonedepletion is another result of pollution. Release of chlorofluorocarbons (CFC's) from aerosol cans, cooling systems and refrigerator equipment removes some of the ozone, causing "holes"; to open up in thislayer and allowing the radiation to reach the earth.

EFFECTS
There are several main types of pollution and known effects of pollution. These include smog, a temperature inversion, acid rain, the...