Pollution in world
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Uploaded by chiritzaCristian on Apr 18, 2008
Pollution, in one sense, is the introduction of contaminants into an environment, of whatever predetermined or agreed upon proportions or frame of reference, that causes instability, disorder, harm or discomfort to the physical systems or living organisms therein.[1] Pollution can be in the form of chemical substances, or energy such as noise, heat, or light. Pollutants can be naturally occurring substances or energies, but are considered contaminants when in excess of natural levels. Pollution is often categorized into point source and nonpoint source pollution.
Uploader Comments (chiritzaCristian)
All Comments (5)
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why we need money??
a man said "when all the people has gone and when all the animals has gone means that money was not helpful"
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forbid oil, weapons, money and religion
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cool man
tine-o tot asa
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esti tare coae...
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whats the song ?? i need it really badd!!!
411fashionproduction 3 years ago
Robert Miles - Children
chiritzaCristian 3 years ago