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In chemistry, deposition is the settling of particles (atoms or molecules) or sediment from a solution or suspension mixture, or the production of a solid on a pre-existing surface. It is also known by the particle model of matter as the process of gas changing form directly to a solid.
The term is also widely used in earth science to describe the same process in a geological sense. 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.
See also: deposition (meteorology), thin film deposition
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