Checking of radiating heat by atmospheric dust, water vapour, ozone, `CO_(2)` etc., is known as:

Options

A. green house effect
B. solar effect
C. ozone layer effect
D. ratioactive effect

Answer

To solve the question regarding the checking of radiating heat by atmospheric dust, water vapor, ozone, and CO2, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Elements Involved**: The question mentions atmospheric dust, water vapor, ozone, and carbon dioxide (CO2). These are all components found in the atmosphere.

2. **Understand Their Role**: These components are known to absorb and re-radiate heat. This means they play a significant role in regulating the Earth's temperature by trapping heat.

3. **Define the Concept**: The process by which certain gases in the atmosphere trap heat from the sun and prevent it from escaping back into space is known as the greenhouse effect.

4. **Relate to the Options Given**: The options provided are:
- Greenhouse effect
- Solar effect
- Ozone layer effect
- Radioactive effect

Among these, the term that best describes the process of trapping heat by the mentioned atmospheric components is the "greenhouse effect."

5. **Conclusion**: Therefore, the correct answer to the question is the "greenhouse effect."

### Final Answer:
The checking of radiating heat by atmospheric dust, water vapor, ozone, and CO2 is known as the **greenhouse effect**.

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