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USGS CMG InfoBank: Sand Dunes

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Comment: 14:24 - 15:01 (00:37)
Source: Annenberg/CPB Resources - Earth Revealed - 22. Wind, Dust and Deserts
Keywords: desert, wind, sand, ocean, continent, dune

Our transcription: Wind-blown sand, too heavy to blow across oceans and continents, bounces and skips along the ground until it is caught by an obstacle in its path.
Here it begins to accumulate forming an even larger trap for additional sand.
Wind plucks sand from the windward side of the dune, blowing it across the crest, where it settles on the quiet leeward side.
So in time, the entire dune shifts downwind grain by grain, possibly migrating kilometers from its point of origin.

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