deserts - Physical Geology 101 31 Deserts and Wind(p...

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Physical Geology 101 1 31. Deserts and Wind (p. 517-533) Wind One of the major means of erosion, transport, and deposition of sediment is by wind. It may be an important factor in any location where there is material light enough to blow around. Locations: 1. ____________________ 2. ____________________ 3. ____________________ 4. ____________________ 5. _____________________________ Transport of Sediment by Wind Any process that involves wind is called an _________________ process. Wind is a turbulent fluid and therefore has many of the same transportation characteristics as water flowing in channels. How dense is air compared to water? ___________________________________________ How does this affect the size of the sediment that air can carry? ______________________________________________________ Wind can suspend clay and silt size particles; very strong winds may be able to suspend small grains of sand. Similar to rivers, the wind-transported sediment load can occur as: 1) ____________________ and 2) ____________________. What two processes move the bed load? 1) __________________ - grains hop and bounce along in small jumps, like in water 2) ___________________ - grains of sand are rolled across the ground by the wind Saltating grains are rarely lifted higher than about 1 meter. As individual grains hit the ground again, they dislodge new grains and cause them to saltate too. How high can suspended sediment be carried? ________________________ How far can suspended sediment be carried? _________________________ Examples of where sediment transport by wind has been significant: 1) ___________________________________ 2) ___________________________________ 3) ___________________________________
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Physical Geology 101 2 Erosion by Wind Wind can erode in two ways: __________________ and ___________________. Abrasion is due to saltating grains of sand impacting against a surface and causing small fragments to chip off, whether it be the surface of another sand grain, a rock face, or some other surface. Abrasion modifies the existing landscape. Individual sand grains become pitted , meaning that they have small pits or gouges in them due to collisions with other grains. Rock surfaces may become smoothed by abrasion, exhibiting a polished appearance. As a rock fragment or stone gets abraded by the wind, the side facing the wind becomes polished and faceted like a gemstone. These rock fragments are called ______________________.
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