Week 3 - Weathering and Erosion

 

Deserts - Great Sand Dunes National Park & Preserve in Colorado

 

 

Source: https://www.nps.gov/grsa/index.htm

 

The Great Sand Dunes National Park & Preserve have been intriguing to me for a few years now. I am hoping to visit there soon. They are mounds and ridges of sand formed by wind. They are made from sediment and loess. Loess is windblown silt that comes from deserts or areas that have been glaciated. Dunes form or take their shape when wind blows sand up a slope then the sand settles to form the slope.



 



 

Source: https://science.howstuffworks.com/environmental/earth/geology/sand-dune1.htm