What is a characteristic feature of the troposphere?

The characteristic feature of the troposphere is that all weather events occur here. This layer of the Earth's atmosphere is the closest to the surface, extending from the ground up to about 8 to 15 kilometers (5 to 9 miles) depending on the latitude and time of year. The troposphere is where we experience clouds, rain, snow, and storms, as it contains most of the atmosphere's mass, including water vapor. The presence of water vapor and the variability of temperatures within the troposphere facilitate the atmospheric conditions necessary for weather phenomena.

The other options are distinct from what defines the troposphere. For instance, the ozone layer is primarily located in the stratosphere, above the troposphere, playing a crucial role in absorbing harmful ultraviolet radiation. While the troposphere is indeed the warmest layer close to the Earth's surface, it is not accurate to label it as the hottest layer, as temperatures can actually increase in the stratosphere due to ozone absorption of UV radiation. Lastly, the assertion that the troposphere contains no water vapor is incorrect, as it is in fact the region of the atmosphere with the highest concentration of water vapor.