Sediment is a naturally occurring material that is broken down by processes of weathering and erosion, and is subsequently transported by the action of wind, water, or ice, and/or by the force of gravity acting on the particle itself.
sedimentation 主要側重於沈澱，是指由於風化和侵蝕等作用，剝離出的物質在各種搬運作用力下聚集到起來。
Deposition is the geological process by which sediments, soil, and rocks are added to a landform or land mass. Fluids such as wind and water, as well as sediment flowing via gravity, transport previously eroded sediment, which, at the loss of enough kinetic energy in the fluid, is deposited, building up layers of sediment.
deposition 更側重於沈積，是個地質的變化過程，主要指沈澱的物質sediments經過長期的化學作用，形成的地質上的沈積相態。