From the perspective of the planetary [[geologist]], the atmosphere is an evolutionary agent essential to the [[Comparative anatomy|morphology]] of a [[planet]]. The [[wind]] transports [[dust]] and other particles which erodes the [[Terrain|relief]] and leaves [[Deposition (sediment)|deposits]] ([[eolian]] processes). [[Frost line|Frost]] and [[Precipitation (meteorology)|precipitation]]s, which depend on the composition, also influence the relief. Climate changes can influence a planet's geological history. Conversely, studying surface of earth leads to an understanding of the atmosphere and climate of a planet - both its present state and its past.
For a [[meteorologist]], the composition of the atmosphere determines the [[climate]] and its variations.
For a [[biologist]], the composition is closely dependent on the appearance of the life and its [[evolution]].
