Closest to the surface of the earth at Sea level or any portion of land that lies below Sea level.
of course not titan has a dense atmosphere as well
The exosphere is the least dense part of the earth's atmosphere.
Troposphere is the most dense part because it is at the bottom of the atmosphere.
In the mesosphere, the air is more dense.
52
dense
Thick air. Planets like Venus, Jupiter, Saturn, Neptune and Uranus have a very dense atmosphere.
One could say that the atmosphere is the least dense, but of the surface the crust is the least dense.
It does have a dense atmosphere.
Thermospehere
About 9ppm, peak.
because it has a dense atmosphere:)