State one important function of ozone layer in the atmosphere. How is it formed there? Which compounds are responsible for the depletion of ozone layer? How do these compounds enter into the atmosphere

Explanation

### Step-by-Step Solution:

1. **Function of the Ozone Layer**:
- The ozone layer is primarily located in the stratosphere and serves a crucial function by protecting the Earth from harmful ultraviolet (UV) radiation emitted by the sun. It acts as a shield, absorbing and filtering out the majority of the sun's harmful UV rays, which can cause skin cancer, cataracts, and other health issues in living organisms.

2. **Formation of the Ozone Layer**:
- The ozone layer is formed through a process involving ultraviolet (UV) radiation. When UV radiation strikes oxygen molecules (O₂) in the atmosphere, it causes these molecules to split into individual oxygen atoms (O). These free oxygen atoms can then react with other oxygen molecules to form ozone (O₃). The overall reaction can be summarized as:
- UV radiation + O₂ → 2O
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