The ozone layer does not start anywhere. It is a complete layer spread all over.
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The ozone layer starts about 6 miles above the Earth's surface in the stratosphere. This layer plays a crucial role in absorbing the sun's ultraviolet (UV) radiation, which helps protect life on Earth from harmful UV rays.
The banning of CFC's is a vital step in protecting the ozone layer. CFC's enter the ozone layer and start a chain reaction with the ozone present there depleting it.
The ozone layer might have started very early. As the UV hit the oxygen, ozone would have been created.
Ozone layer contains ozone in it. Therefore, it is named so.
Earth has a layer of ozone. It is present as the ozone layer.
Earth and Venus have a protective ozone layer. These planets have ozone molecules in ozone layer.