CFC’s chlorofluorocarbons are normally quite and stable but when as they get higher in the atmosphere they are broken down with the strong UV rays.
The chlorine is resealed hits an the ozone molecule and taking away one of its 3 oxygen(O) molecule the turning of the ozone(O3) into the oxygen(O2). After this the chlorine which monoxide could react with the another chlorine monoxide, leaving the chlorine atom in free and two of the oxygen atoms forming and also another oxygen(O2). Natural chlorine has be the same effect but the atoms have a shorter life span, so the man made causes are more trouble.
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