In which layer of the atmosphere does most weather occur?

The troposphere is the layer of the atmosphere where most weather phenomena occur. This is primarily due to its proximity to Earth's surface, where the majority of the atmosphere's mass is concentrated. The troposphere extends from the surface to about 8 to 15 kilometers (5 to 9 miles) in altitude, depending on location and weather conditions.

In this layer, the temperature decreases with altitude, and it is filled with water vapor and other gases essential for weather systems. The troposphere is where clouds form, precipitation occurs, and various weather events, such as thunderstorms, wind patterns, and fronts, develop.

Above the troposphere, the stratosphere contains the ozone layer, which absorbs and scatters ultraviolet solar radiation but has minimal weather activity due to its relatively stable conditions. The mesosphere lies above the stratosphere and is characterized by decreasing temperatures again, leading to a lack of weather phenomena. The exosphere is the outermost layer and primarily consists of extremely thin air and hydrogen and helium, lacking the necessary conditions for weather activities.

Therefore, the troposphere's characteristics make it the most active layer in terms of weather development and changes.