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Dune
From Wikipedia, the free encyclopedia
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For other uses, see
Dune (disambiguation).
Erg Chebbi, Morocco
Dunes of
Maspalomas in
Gran Canaria
Avalanche deposits on a crest of the Kelso Dunes, Mojave National Preserve, California.
Dunes in
Taklamakan Desert, China (i-cubed
Landsat 7 satellite imagery)
In
physical geography, a dune is a
hill of
sand built by
wind. Dunes occur in different forms and sizes, formed by interaction with the wind. Most kinds of dunes are longer on the windward side where the sand is pushed up the dune and have a shorter "slip face" in the lee of the wind. The valley or trough between dunes is called a slack. A "dune field" is an area covered by extensive sand dunes. Large dune fields are known as
ergs.
Some coastal areas have one or more sets of dunes running parallel to the shoreline directly inland from the
beach. In most cases the dunes are important in protecting the land against potential ravages by storm waves from the
sea. Although the most widely distributed dunes are those associated with coastal regio...
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