You have witnessed weather phenomena, such as winds, storms, rainfall, etc. Class 9

You have witnessed weather phenomena, such as winds, storms, rainfall, etc. Class 9

Question 1.

You have witnessed weather phenomena, such as winds, storms, rainfall, etc. Which atmospheric layer is mainly responsible for such phenomena and what is the primary reason for its occurrence? Class 9

Answer:

Troposphere: The troposphere is the atmospheric layer mainly responsible for all weather phenomena like winds, storms and rainfall.

Key Features:

1. Extends from Earth’s surface to about 12 km height.
2. Temperature decreases with height at about 6.5°C per km.
3. Contains most water vapour, dust and clouds.

Primary Reason:

The main reason is the uneven heating of Earth’s surface by solar radiation. This works as follows:

1. Warm air near the surface rises upward, creating low pressure.
2. Cool air rushes in to fill this gap, creating winds.
3. Rising warm air cools and water vapour condenses to form clouds.
4. This leads to precipitation as rain, hail or snow.
5. These processes together produce weather phenomena like storms and rainfall.

Why not other layers:

1. The stratosphere is calm due to temperature increasing with height.
2. Other layers play only a minor role in surface climate.

Conclusion: The troposphere is heated from the Earth’s surface and contains all moisture needed for weather formation. Uneven heating is the primary reason for all weather phenomena.