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Dust is made up of very tiny (about 1–10 µm) soil particles (fine silt and clay) and other fine particulate materials carried by wind on local to global scales. Because dust particles are so small, they can remain suspended in air for long periods of time. For this reason, dust may be transported across or between entire continents before being deposited, usually in rainfall. Dust is a form of wind erosion of soil; 40 percent of the soil eroded in the United States is eroded and transported by wind. Long-distance transport of dust can play a role in soil formation and development through the deposition of silt, clay, and soil nutrients and minerals. Scientists suspect that much of the calcium carbonate in the soils of ...

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