What are the properties of Troposphere?

Following are the properties of Troposphere:

1. It is lower most atmospheric layer with 14 km average thickness. Its thickness is about 8 km at poles and 18 km at equator.
2. All weather phenomena like cloud formation, precipitation, fog etc. takes place in this layer.
3. In addition to pure air, it contains water vapour and dust.
4. There is decrease in temperature with increasing altitude at the rate of 6.4° C per km in troposphere.
5. Tropopause marks the upper boundary of troposphere.