"Atmospheric deposition is the transfer of substances from the air to the surface of the earth, either in wet form (rain, fog, snow, dew, frost, hail) or in dry form (gases, aerosols, particles). Source: http://biology.usgs.gov/ecosystems/atmospheric_deposition.html"@en . "2010-06-03T16:31:12Z"^^ . "2010-06-03T16:19:12Z"^^ .