PDE Q50

All vital atmospheric processes such as cloud formation, rainfall, storms, and temperature changes take place in the troposphere. This is the lowest layer of the atmosphere, extending up to about 8 to 15 kilometers from the Earth's surface. It contains most of the atmospheric water vapor and is directly influenced by the Earth's surface.

• Option A: Troposphere
  Correct. It is the most active part of the atmosphere in terms of weather and climate.

• Option B: Ionosphere
  Incorrect. The ionosphere is a part of the thermosphere and is important for radio communication, not weather.

• Option C: Exosphere
  Incorrect. This is the outermost layer of the atmosphere where atmospheric particles are very sparse and weather processes do not occur.

• Option D: Stratosphere
  Incorrect. This layer lies above the troposphere and contains the ozone layer but does not support most weather activities.