In which layer of the atmosphere is most of the world’s weather found?

The troposphere is the correct answer because it is the lowest layer of the Earth's atmosphere and extends from the surface up to about 8 to 15 kilometers (5 to 9 miles) high, depending on geographic location and weather conditions. This is where the majority of meteorological phenomena occur, including clouds, rain, wind, and other weather events. The troposphere contains most of the atmosphere's mass, as well as water vapor, which is critical for weather formation.

In contrast, the stratosphere, located above the troposphere, is where the ozone layer is situated and has a stable temperature structure that does not support the weather phenomena seen in the layers below. The mesosphere, above the stratosphere, experiences decreasing temperatures with altitude and is not associated with weather events. Lastly, the thermosphere, the uppermost layer, has very low density and encounters extreme temperatures, but it does not contain the conditions necessary for weather as we know it. Therefore, the troposphere is indeed the layer where most of the world’s weather is found.