The troposphere is the lowest layer of Earth's atmosphere, extending from the surface up to about 10-15 kilometers (6-9 miles) above sea level.

In the troposphere, temperature generally decreases with increasing altitude.

This is because the troposphere is heated primarily from the Earth's surface, and as you move higher, you move away from this heat source.

This temperature decrease with height is what creates the convective currents responsible for weather patterns and phenomena such as clouds, rain, and winds.