Harmful ultraviolet rays coming from sun are absorbed by

Options

A. oxygen
B. carbon dioxide
C. ozone layer
D. dust particles of atmosphere.

Explanation

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks about what absorbs harmful ultraviolet (UV) rays coming from the sun.

2. **Identifying the Protective Layer**: The Earth has a protective layer located in the stratosphere that absorbs UV rays. This layer is known as the ozone layer.

3. **Function of the Ozone Layer**: The ozone layer acts like a shield. When sunlight reaches the Earth, a portion of it passes through the ozone layer, while the harmful UV rays are absorbed or reflected back into space.

4. **Importance of the Ozone Layer**: The ozone layer is crucial because it absorbs about 97% to 99% of the harmful UV rays. Without it, these rays would reach the Earth's surface, leading to increased risks of skin cancer and other health issues.

5. **Conclusion**: Therefore, the correct answer to the question is that the harmful ultraviolet rays coming from the sun are absorbed by the ozone layer.