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2 definitions by Wei Chong

 
1.
A gas which have a chemical symbol of CO2.It is a mixture of 1 carbon element and 2 oxygen element.It is present in the Earth's atmosphere at a low concentration of approximately 0.038% and is an important greenhouse gas. In its solid state, it is called dry ice. It is a major component of the carbon cycle.Produced in the process of burning.It is also a global warming gases or greenhouse gases which cause global warming(the rise of global temperature).
Carbon dioxide is produced in the process of burning & living things respiration.It is produced everyday.
by Wei Chong May 25, 2007
 
2.
ozone layer is made by 3 oxygen element.Ozone layer is capable of blocking UVB(harmful UV ray).However,chlorofluorocarbons(CFCs) is depleting the ozone layer.CFCs can takes up to 8 years to reach the atmosphere.Once there,it will start breaking up ozone molecule and more UV ray(UVB) penetrate to the Earth.
As a result,people get cataract whih will lead to blindness,skin cancer which might peel off ur skin.
The ozone layer, or ozonosphere layer (rarely used term), is the part of the Earth's concentrations of ozone (O3).
by Wei Chong May 19, 2007