Dune

Isolated barchan dunes on the surface of Mars. Dominant wind direction would be from left to right.

Large linear dunes in the Great Sand Sea in southwest Egypt, seen from the International Space Station. The distance between each dune is 1.5-2.5 km.

In physical geography, a dune is a hill of sand built by either wind or water flow. Dunes occur in different shapes and sizes, formed by interaction with the flow of air or water. 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.

单词	Parabolic dune
释义	Parabolic dune 英语百科 Dune In physical geography, a dune is a hill of sand built by either wind or water flow. Dunes occur in different shapes and sizes, formed by interaction with the flow of air or water. 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.
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Parabolic dune

Dune