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A considerable part of the harmful ultra...

A considerable part of the harmful ultraviolet radiation of the sun does not reach the surface of earth. This is because in the upper atmosphere, there is a layer of

A

`O_3`

B

`CO_2`

C

`NH_3`

D

`H_2`

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The correct Answer is:
To answer the question regarding why a considerable part of harmful ultraviolet radiation from the sun does not reach the surface of the Earth, we can follow these steps: ### Step-by-Step Solution: 1. **Understanding Ultraviolet Radiation**: - Ultraviolet (UV) radiation is a type of electromagnetic radiation emitted by the sun. It is harmful to living organisms and can cause skin cancer, cataracts, and other health issues. 2. **Role of the Atmosphere**: - The Earth's atmosphere plays a crucial role in protecting the surface from harmful UV radiation. It contains various gases that absorb and scatter UV rays. 3. **Identifying the Protective Layer**: - Among the gases present in the atmosphere, one specific layer is known for its ability to absorb UV radiation effectively. This layer is primarily composed of ozone (O3). 4. **Function of Ozone**: - Ozone in the upper atmosphere (stratosphere) absorbs the majority of the sun's harmful UV radiation. This absorption prevents most of the UV rays from reaching the Earth's surface, thereby protecting living organisms. 5. **Conclusion**: - Therefore, the considerable part of harmful ultraviolet radiation of the sun does not reach the surface of the Earth because of the layer of ozone (O3) present in the upper atmosphere. ### Final Answer: The correct answer is that in the upper atmosphere, there is a layer of **O3 (ozone)** that protects the Earth from harmful ultraviolet radiation. ---
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