1. When herbicides or pesticides are moved by wind or other factors from an intended target to a nearby unintended target. [Source: USFS – IPED Field Guide]

  2. A general term applied to all mineral material (clay, silt, sand, gravel, and boulders) transported by a glacier and deposited directly by or from the ice or transported by running water emanating from a glacier. Drift includes unstratified material (till) that forms moraines and stratified deposits that form outwash plains, eskers, kames, varves, and glaciofluvial sediments. The term is generally applied to Pleistocene glacial deposits in areas that no longer contain glaciers. [Source: NRCS Glossary]
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