Deposition is the process by which, in sub-freezing air, water vapor changes directly to ice without first becoming a liquid. This is how snow forms in clouds, as well as frost and hoar frost on the ground.
Deposition is a term used in chemistry to describe the settling of particles or sediment from a solution or suspension mixture, or the production of a solid on a pre-existing surface.
Deposition of particles is an aggradational process — one that builds a landform — as opposed to a degradational process that erodes or reduces the size of a landform.
For example, a river mouth delta is formed by deposition of sediment carried by the stream as the river current diminishes upon encountering the sea.
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