A gust of wind can quickly blow through a small area, and strong winds can carry debris such as volcanic ash or dust across an entire continent or ocean. Here, a plume of dust from the Sahara sweeps across the entire Atlantic Ocean. This phenomenon is so frequent that it is nicknamed the region's "Sahara dust layer."

Image courtesy NASA, by Jeff Schmaltz, MODIS Rapid Response

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Wind is the movement of air caused by the uneven heating of the Earth by the sun.