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=== Deposition to Rest === Deposition is a combination of gravity and inertia. The fall speed for small particles can be calculated by mass and geometry, but the complex shapes of pollen and spores often fall slower than their estimated speed modeled with simple shapes.<ref>{{cite journal |last1=Sabban |first1=Lilach |last2=van Hout |first2=RenΓ© |title=Measurements of pollen grain dispersal in still air and stationary, near homogeneous, isotropic turbulence |journal=Journal of Aerosol Science |date=December 2011 |volume=42 |issue=12 |pages=867β882 |doi=10.1016/j.jaerosci.2011.08.001 |bibcode=2011JAerS..42..867S }}</ref> Spores can also be removed from the air from impact; the inertia of the particles will cause them to hit surfaces along their path, instead of flowing around them like air.<ref name=":1" />
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