What is a key characteristic of the troposphere?

A key characteristic of the troposphere is that it begins at the Earth's surface. This layer is the lowest part of the atmosphere, extending up to about 8 to 15 kilometers (5 to 9 miles) above sea level. It plays a crucial role in weather and climate because it is where nearly all weather phenomena occur. The troposphere contains most of the atmosphere's mass, including the majority of its water vapor and aerosols, which is why it is significant for weather formation and air quality.

This foundational aspect of the troposphere allows us to understand various atmospheric processes, such as the formation of clouds and precipitation, as they all take place within this layer. Understanding that the troposphere starts directly at the Earth’s surface helps to contextualize how atmospheric conditions immediately above ground level affect what we experience in our day-to-day weather.