Which gas of the atmosphere holds up ultraviolet rays

Options

A. `O_(2)`
B. `O_(3)`
C. `N_(2)`
D. `CO_(2)`

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks which gas in the atmosphere is responsible for absorbing ultraviolet (UV) rays.

2. **Defining Ultraviolet Rays**: Ultraviolet rays, commonly referred to as UV rays, are a type of electromagnetic radiation emitted by the sun. They can be harmful to living organisms, causing skin damage and other health issues.

3. **Identifying the Protective Layer**: The Earth's atmosphere contains several gases, but one specific gas plays a crucial role in protecting the planet from harmful UV radiation.

4. **Recognizing the Key Gas**: The gas that absorbs the majority of UV rays in the atmosphere is ozone (O3). Ozone molecules consist of three oxygen atoms.

5. **Function of Ozone**: Ozone forms a layer in the stratosphere, known as the ozone layer, which acts as a shield by absorbing and filtering out the harmful UV rays from the sun, thus protecting life on Earth.

6. **Conclusion**: Therefore, the gas of the atmosphere that holds up ultraviolet rays is ozone (O3).

**Final Answer**: Ozone (O3)

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