In which region of the atmosphere , temperature decreases with altitudes ?

Options

A. Troposphere
B. Stratosphere
C. thermosphere
D. none of these

Answer

To answer the question, "In which region of the atmosphere does temperature decrease with altitude?", we can follow these steps:

### Step 1: Identify the Layers of the Atmosphere
The atmosphere is divided into several layers based on temperature gradients. The main layers are:
- Troposphere
- Stratosphere
- Mesosphere
- Thermosphere
- Exosphere

### Step 2: Understand Temperature Behavior in Each Layer
- **Troposphere**: This is the layer closest to the Earth's surface, extending up to about 10-20 km. In this layer, temperature decreases with altitude.
- **Stratosphere**: Above the troposphere, the temperature begins to increase with altitude due to the presence of the ozone layer which absorbs UV radiation.
- **Mesosphere**: In this layer, temperature again decreases with altitude.
- **Thermosphere**: Here, temperature increases significantly with altitude due to the absorption of high-energy solar radiation.
- **Exosphere**: This is the outermost layer where temperature can vary but is generally considered to be very high.

### Step 3: Conclude the Answer
From the above analysis, we can conclude that the temperature decreases with altitude primarily in the **troposphere** and also in the **mesosphere**. However, the troposphere is the most significant layer where this phenomenon occurs, as it is where we live and experience weather.

### Final Answer
The region of the atmosphere where temperature decreases with altitude is the **troposphere**.

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