BY Andrew Curtis

http://travel.nationalgeographic.com/travel/national-parks/great-sand-dunes-national-park/

The Great Sand Dunes of San Luis

Valley

Locationhttps://encrypted-tbn2.gstatic.com/images?q=tbn:ANd9GcQPkEwbM-P2feCwOu3dQG8iTGbAlwbv__LKnFT80iJ6216rxT34_A

The Great San Dunes are in the San Luis Valley in Southern ColoradoThe Dunes lay against the San Luis mountains and is located near many streams.

FORMEDhttp://newdeserttimes.com/wp-content/uploads/2010/01/bigstockphoto_great_sand_dunes_national_park_5539446.jpg

The Great Sand Dunes started forming about 440,00

Formed by the Aeolian process.Aeolian Transportation and Deposition

Wind carried sand from Rio Grnde river and other bodies of water near by.

ALTERCATIONhttp://giltphoto.com/images/Colorado/Great%20Sand%20Dunes%20National%20Park/GreatSandDunes06w.jpgThe wind is constantly changing the shape of each individual dune. This is why you can spot many types of dunes.

brachanTransverseSeifsStar Dunes

The Great Sand Dunes National Park And Preserve

http://giltphoto.com/images/Colorado/Great%20Sand%20Dunes%20National%20Park/GreatSandDunes06w.jpg