Question

tell this question from our environment class 10​

Answer 1

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Answer,

• Ozone depletion consists of two related events observed since the late 1970s: a steady lowering of about four percent in the total amount of ozone in Earth's atmosphere, and a much larger springtime decrease in stratospheric ozone around Earth's polar regions.

• The latter phenomenon is referred to as the ozone hole.

• The ozone hole has developed because people have polluted the atmosphere with chemicals containing chlorine and bromine.

• Once released from CFCs, chlorine (Cl) then reacts with ozone (O3) to form ClO and O2.

• ClO quickly breaks down to release the Cl atom which can repeat the process with another O3 molecule.

• To halt the depletion of the ozone layer, countries around the world agreed to stop using ozone-depleting substances.

• The main substances include chlorofluorocarbons (CFCs), hydrochlorofluorocarbons (HCFCs), halons, carbon tetrachloride, methyl chloroform and methyl bromide.

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