WIND
![Picture](/uploads/1/9/1/7/19177945/4536143.jpg?295)
- HOW WIND CAUSES EROSION: Wind causes erosion by deflation and abrasion.
- DEFLATION: Deflation is the process by which wind removes surface materials. When wind blows over the land, it picks up the smallest particles of sediment. This sediment is made of bits of clay and silt. The stronger the wind, the larger the particles it can pick up. slightly heavier particles, such as sand, might skip or bounce for a short distance.
- ABRASION: Abrasion by wind-carried sand can polish rock, but it causes little erosion. At one time, geologists thought that the sediment carried by wind cut the stone shapes seen in deserts.But now evidence shows that most desert landforms are the result of weathering and water erosion.
- WIND DEPOSITION: Wind erosion and deposition may form sand dunes and loess deposits. when the wind strikes an obstacle , the result is usually a sand dune. Sand dunes can be seen in beaches and in deserts where windblown sediment has built up.
- SAND DUNES: Sand dunes comes in all different shapes and sizes. Some sand dunes in China have grown to heights of 500 meters. Sand dunes move over time, little by little the sand shifts from one of the dune to the other from the wind.
- LOESS DEPOSITS: Sediment that is finer than sand, such as particles of clay and silt, it sometimes deposited in layers far from its source. This fine, wind-deposited sediment is loess. Large loess deposits are found in central China and in states such as Nebraska, South Dakota, Iowa, Missouri, and Illinois.