`O_(3)` in ozone layer is formed by action of

Options

A. IR radiations
B. Blue radiations
C. UV radiations
D. Other radiations

Answer

To solve the question about how O₃ (ozone) in the ozone layer is formed, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Ozone Layer**:
- The ozone layer is a region of Earth's stratosphere that contains a high concentration of ozone (O₃) molecules. It plays a crucial role in protecting life on Earth by absorbing the majority of the sun's harmful ultraviolet (UV) radiation.

2. **Identifying the Formation Process**:
- Ozone is formed through a photochemical reaction involving oxygen (O₂) and ultraviolet (UV) radiation from the sun.

3. **Breaking Down the Oxygen Molecule**:
- The first step in the formation of ozone involves the dissociation of an oxygen molecule (O₂) into two individual oxygen atoms (O). This process is initiated by UV radiation, which provides the energy needed to break the O₂ bond.

4. **Combining Oxygen Atoms with Oxygen Molecules**:
- Once the individual oxygen atoms are formed, they can react with other oxygen molecules (O₂). One of the oxygen atoms combines with an O₂ molecule to form ozone (O₃).

5. **Conclusion**:
- Therefore, the correct answer to the question is that O₃ in the ozone layer is formed by the action of UV radiations.

### Final Answer:
O₃ in the ozone layer is formed by the action of **UV radiations**.

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