How is ozone formed in the upper atmosphere? State its importance. What is responsible for its depletion ? Write one harmful effect of ozone depletion.

Explanation

### Step-by-Step Solution:

1. **Formation of Ozone in the Upper Atmosphere:**
- Ozone (O3) is formed in the upper atmosphere primarily due to the interaction of ultraviolet (UV) light from the sun with oxygen molecules (O2).
- When UV light strikes an oxygen molecule, it splits the molecule into two individual oxygen atoms, known as nascent oxygen.
- These nascent oxygen atoms can then react with other oxygen molecules (O2) to form ozone (O3).

2. **Importance of Ozone:**
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