Sand

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In physical geography , a dune is a hill of loose sand built by wind or the flow of water. [1] 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. Dunes occur, for example, in some deserts and along some coasts.

Another reason for sand mining is the extraction of minerals such as rutile , ilmenite and zircon , which contain the industrially useful elements titanium and zirconium . These minerals typically occur combined with ordinary sand, which is dug up, the valuable minerals being separated in water by virtue of their different densities, and the remaining ordinary sand re-deposited.