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One last view of the details at Warren Dunes. Lots of trees that have been downed for ages... the dunes get what they want.
The Pinnacles Western Australia,about 3 hours drive north of Perth,limestone pinnacles.See Wikipedia for a full explanation of their origins,scan from slide.
May term students take a plunge down the largest gypsum dune field on the planet at the White Sands National Monument in New Mexico.
This is as we were just walking into the dunes. Since the dunes shift so much, sometimes it's a bit of a walk to get to where the "hills" start. I remembered them being much closer to the parking area!
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In physical geography, a dune is a hill of sand built either by wind or water flow. Dunes occur in different forms 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. 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 regions, the largest complexes of dunes are found inland in dry regions and associated with ancient lake or sea beds.
Dunes also form under the action of water flow (fluvial processes), and on sand or gravel beds of rivers, estuaries and the sea-bed.