The troposphere is the lowest part of Earth's atmosphere, the layer closest to the ground. It extends from sea level up to about 12 kilometers high.
When people talk about weather or climate, they often refer to the troposphere as the area where most weather occurs - clouds form, rain falls, and temperature changes are more noticeable here than in higher layers of the atmosphere. Scientists also use the term when discussing global warming and how it affects the Earth's systems.
The lower levels of the atmosphere extending from the surface of the Earth or another celestial body up to the tropopause. It is characterized by convective air movements and a large vertical temperature change.
