The ozone layer is broken down by UV. It decomposes it into nascent oxygen and oxygen molecule.
Breakdown of ozone layer can be prevented by:Planting more treesAvoiding the use of CFC's.
The breakdown of ozone is caused by us. Only we can stop it.
See "What is the ozone layer?"
The ozone layer consists of pool of ozone molecules. they are allotrope of oxygen molecule.
See "How is the ozone layer being destroyed?"
No oxygen is not a danger to ozone layer in stratosphere. It is because oxygen itself participates in the creation of ozone.
Ozone is created by the oxygen molecules. When the UV falls on oxygen, ozone is formed.
Oxygen is O2. Ozone is O3.
Uranus does not have a ozone layer. It does not have a oxygen and no UV radiation to convert it into ozone.
No there is no ozone layer on mars. It is because of no proper oxygen there.
Ozone layer is formed by UV radiations. These UV rays decompose oxygen to 2 nascent oxygen which reacts with oxygen to form ozone.
Oxygen cycle is at ground level. Ozone layer is in atmosphere.