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 how does air get polluted?

Asked by Rohit(student), on 22/1/11

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Air pollution is usually a result of human activity. The main causes of human air pollution is  from cars, waste disposal and industry. However air can also be polluted from natural processes, like volcanic activity which releases various pollutants like sulphur for example. Other natural pollutants include carbon monoxide an dioxide from wildfires, and as the other guy said, radon from radioactive decay within the earths crust.

hope i mde it clear...THUMBS UP

Posted by Aneeta Joseph(student), on 23/1/11
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what is global warming?

Posted by Achsah Mariyam ...(student), on 4/1/12
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  Global warming is when the earth heats up (the temperature rises).  It happens when greenhouse gases (carbon dioxide, water vapor, nitrous oxide, and methane) trap heat and light from the sun in the earth’s atmosphere, which increases the temperature.   This hurts many people, animals, and plants.  Many cannot take the change, so they die.

Posted by Achsah Mariyam ...(student), on 4/1/12
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