Sand+dunes

 Sand Dunes are formed when an inanimate object on the beach accumulates sand, burying the obstacle, and forming a mound, this catches more and more sand and becomes more and more of an obstacle until it grows into a sizeable hill. As this growth continues, sand is locked into the dune by vegetation and its roots
 * Sand Dune **
 * Overview **

1, Necessities for Sand Dunes Three necessities · A large supply of dry sand · A wind · An obstacle

A large supply of sand: it is the main composition of the dune

A wind: it transports and deposits the sand through saltation

An obstacle: A place where sand can build up, examples of these can range from sea weed to a fallen tree

2, The Process 1, The wind break is widened and heightened by the sand causing there to be a greater surface area for sand to accumulate.

2, Marram grass and sand couch are the vegetation that forms that not only keeps the sand dune structure together with its roots, but slows wind speed with the over ground elements of the plants, causing wind to not have enough energy to carry the sand, which therefore forces it to deposit the load on the dune.

3, The Erosion It seems with this constant expansion of the dune it must never stop growing, but erosion is the factor that prevents this

1, The Tide comes in and often brushes away the smaller, less developed dunes and hits the more developed dunes, either eroding them with force or just making the loose sand part of it’s load

2, Waves hit the dune, undercutting it and causing the sand on top of the eroded area to topple without the support

3, People often walk on the sand dunes and their weight and walking movement often erodes the frame



Links: http://www.geography-site.co.uk/pages/physical/coastal/dunes.htm http://www.slideshare.net/geographyalltheway/igcse-geography-sand-duns?from=email&type=share_slideshow&subtype=slideshow www.wikipedia.org http://www.geographyalltheway.com/igcse_geography/natural_environments/marine_processes/igcse_sand_dunes.htm Produce a revision wiki page detailing the formation your selected landforms:
 * ==Title of Coastal Feature  ==

 Remember: Your target audience are fellow GCSE/IGCSE students. Once you have produced your wiki page you will be asked to review one produced by one of your peers. You should proof read it - changing any spelling and punctuation as necessary. You should also try and contribute something extra to the wiki page you are reviewing - an additional example, a relevant clip from YouTube or Google Video or some additional explanation. ||
 * How erosion and/or deposition processes produce the landform.
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