Layer of the atmosphere where weather occurs?

• A. Troposphere
• B. Stratosphere
• C. Mesosphere
• D. Thermosphere

Answer: (A)

Weather happens in the layer closest to Earth’s surface. This part of the atmosphere contains most of the air, water vapor, and aerosols needed for clouds, rain, snow, and storms. The sun heats the ground, warming the air above it; warm air rises and creates convection, which drives the lifting, cooling, and condensation that produce clouds and weather events. The temperature in this layer generally falls with altitude, supporting ongoing vertical development of weather systems until you reach the boundary with the next layer, the tropopause.

Above this layer, the air becomes much drier and more stable, so large-scale weather phenomena don’t form in the same way. The next layers—one with a stable, increasing temperature profile and less vertical mixing, then another where temperatures drop and meteors burn up, and finally a very thin, solar-heated layer—are not where weather is generated.