Which of the following is the uppermost region of the atmosphere ?

Options

A. Stratosphere
B. Troposphere
C. Exosphere
D. Ionosphere

Answer

To determine the uppermost region of the atmosphere, we can analyze the different layers of the atmosphere and their respective altitudes. Here’s a step-by-step breakdown of the solution:

### Step 1: Identify the Layers of the Atmosphere
The atmosphere is divided into several layers based on altitude. The main layers are:
- **Troposphere**: Extends from 0 km to about 11 km.
- **Stratosphere**: Extends from 11 km to about 50 km.
- **Mesosphere**: Extends from 50 km to about 85 km.
- **Thermosphere**: Extends from 85 km to about 500 km.
- **Exosphere**: Extends from 500 km to about 10,000 km.

### Step 2: Determine the Uppermost Layer
Among these layers, the **Exosphere** is the highest layer of the atmosphere. It lies above the thermosphere and extends up to approximately 10,000 km.

### Step 3: Conclusion
Since the question asks for the uppermost region of the atmosphere, the answer is the **Exosphere**.

### Final Answer
The uppermost region of the atmosphere is the **Exosphere**.

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