1. Air that moves across the earth’s surface is called wind.

2. Wind Erosion Deflation and Abrasion
Wind erodes Earth’s surface by deflation and abrasion.
When wind erodes by deflation, it blows across loose sediment, removing small particles such as silt and sand.
The heavier, coarser material is left behind.
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3. Wind Erosion Deflation and Abrasion
3. When wind blown sediment strikes rock, the surface of the rock gets scraped and worn away by a process called Abrasion.
Abrasion is similar to sand blasting.
The rocks become pitted and worn down gradually over time due to abrasion.
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Save this template as a presentation (.ppt file) on your computer.
Open the presentation that will contain the image slide.
On the Slides tab, place your insertion point after the slide that will precede the image slide. (Make sure you don't select a slide. Your insertion point should be between the slides.)
On the Insert menu, click Slides from Files.
In the Slide Finder dialog box, click the Find Presentation tab.
Click Browse, locate and select the presentation that contains the image slide, and then click Open.
In the Slides from Files dialog box, select the image slide.
Select the Keep source formatting check box. If you do not select this check box, the copied slide will inherit the design of the slide that precedes it in the presentation.
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4. Wind Erosion Deflation and Abrasion
Deflation and Abrasion happen to all land surfaces but occur mostly in deserts, beaches, and plowed fields.
These areas have fewer vegetation to hold the soil in place, so when wind blows over them, they can be eroded rapidly.
Grasslands or pasture lands have many plants to hold the soil in place, therefore there is little soil erosion caused by the wind.
To insert this slide into your presentation
Save this template as a presentation (.ppt file) on your computer.
Open the presentation that will contain the image slide.
On the Slides tab, place your insertion point after the slide that will precede the image slide. (Make sure you don't select a slide. Your insertion point should be between the slides.)
On the Insert menu, click Slides from Files.
In the Slide Finder dialog box, click the Find Presentation tab.
Click Browse, locate and select the presentation that contains the image slide, and then click Open.
In the Slides from Files dialog box, select the image slide.
Select the Keep source formatting check box. If you do not select this check box, the copied slide will inherit the design of the slide that precedes it in the presentation.
Click Insert.
Click Close.

5. Works of wind Wind works in two ways to erode surface materials:
1. Deflation and Abrasion
Deflation -
Blow out
Abrasion - Ventifacts

6. Deposition by Wind Loess (less) Loess is as fine as talcum powder.
Wind deposits of fine grained sediments.
Examples found near the Mississippi and Missouri Rivers
Strong winds that blew across glacial outwash areas carried the sediments and deposited them.
Loess is as fine as talcum powder.
Many farmlands of the Midwestern United States have fertile soils that developed from loess deposits.
To insert this slide into your presentation
Save this template as a presentation (.ppt file) on your computer.
Open the presentation that will contain the image slide.
On the Slides tab, place your insertion point after the slide that will precede the image slide. (Make sure you don't select a slide. Your insertion point should be between the slides.)
On the Insert menu, click Slides from Files.
In the Slide Finder dialog box, click the Find Presentation tab.
Click Browse, locate and select the presentation that contains the image slide, and then click Open.
In the Slides from Files dialog box, select the image slide.
Select the Keep source formatting check box. If you do not select this check box, the copied slide will inherit the design of the slide that precedes it in the presentation.
Click Insert.
Click Close.

7. Loess and yellow river in China
Desert in central Asia

8. Deposition by Wind Dunes
Created when wind blows sediments against an obstacle such as a rock or clump of vegetation.
Wind drops sediments because is loses its energy of motion.
The sediment itself then becomes an obstacle, trapping even more material.
To insert this slide into your presentation
Save this template as a presentation (.ppt file) on your computer.
Open the presentation that will contain the image slide.
On the Slides tab, place your insertion point after the slide that will precede the image slide. (Make sure you don't select a slide. Your insertion point should be between the slides.)
On the Insert menu, click Slides from Files.
In the Slide Finder dialog box, click the Find Presentation tab.
Click Browse, locate and select the presentation that contains the image slide, and then click Open.
In the Slides from Files dialog box, select the image slide.
Select the Keep source formatting check box. If you do not select this check box, the copied slide will inherit the design of the slide that precedes it in the presentation.
Click Insert.
Click Close.

9. Deposition by Wind Dunes
If the wind blows long enough, the mound will become a dune.
A DUNE is a mound of sediments drifted by the wind.
To insert this slide into your presentation
Save this template as a presentation (.ppt file) on your computer.
Open the presentation that will contain the image slide.
On the Slides tab, place your insertion point after the slide that will precede the image slide. (Make sure you don't select a slide. Your insertion point should be between the slides.)
On the Insert menu, click Slides from Files.
In the Slide Finder dialog box, click the Find Presentation tab.
Click Browse, locate and select the presentation that contains the image slide, and then click Open.
In the Slides from Files dialog box, select the image slide.
Select the Keep source formatting check box. If you do not select this check box, the copied slide will inherit the design of the slide that precedes it in the presentation.
Click Insert.
Click Close.

10. Deposition by Wind Moving Dunes A sand dune has two sides.
Side facing the wind has a gentler slope.
The side away from the wind is steeper.
The shape of the dune tells you the direction.
Unless sand dunes are planted with grasses, most dunes move, or migrate away from the direction of the wind. (See figure next slide)
To insert this slide into your presentation
Save this template as a presentation (.ppt file) on your computer.
Open the presentation that will contain the image slide.
On the Slides tab, place your insertion point after the slide that will precede the image slide. (Make sure you don't select a slide. Your insertion point should be between the slides.)
On the Insert menu, click Slides from Files.
In the Slide Finder dialog box, click the Find Presentation tab.
Click Browse, locate and select the presentation that contains the image slide, and then click Open.
In the Slides from Files dialog box, select the image slide.
Select the Keep source formatting check box. If you do not select this check box, the copied slide will inherit the design of the slide that precedes it in the presentation.
Click Insert.
Click Close.

11. Deposition by Wind Moving Dunes
Some dunes are known as traveling dunes because they move rapidly across desert areas.
To insert this slide into your presentation
Save this template as a presentation (.ppt file) on your computer.
Open the presentation that will contain the image slide.
On the Slides tab, place your insertion point after the slide that will precede the image slide. (Make sure you don't select a slide. Your insertion point should be between the slides.)
On the Insert menu, click Slides from Files.
In the Slide Finder dialog box, click the Find Presentation tab.
Click Browse, locate and select the presentation that contains the image slide, and then click Open.
In the Slides from Files dialog box, select the image slide.
Select the Keep source formatting check box. If you do not select this check box, the copied slide will inherit the design of the slide that precedes it in the presentation.
Click Insert.
Click Close.

12. Deposition by Wind To insert this slide into your presentation
Save this template as a presentation (.ppt file) on your computer.
Open the presentation that will contain the image slide.
On the Slides tab, place your insertion point after the slide that will precede the image slide. (Make sure you don't select a slide. Your insertion point should be between the slides.)
On the Insert menu, click Slides from Files.
In the Slide Finder dialog box, click the Find Presentation tab.
Click Browse, locate and select the presentation that contains the image slide, and then click Open.
In the Slides from Files dialog box, select the image slide.
Select the Keep source formatting check box. If you do not select this check box, the copied slide will inherit the design of the slide that precedes it in the presentation.
Click Insert.
Click Close.

13. Deposition by Wind Dune Shape
The shape of the dune depends on the amount of sand or other sediment available, the wind speed and direction, and the amount of vegetation present.
To insert this slide into your presentation
Save this template as a presentation (.ppt file) on your computer.
Open the presentation that will contain the image slide.
On the Slides tab, place your insertion point after the slide that will precede the image slide. (Make sure you don't select a slide. Your insertion point should be between the slides.)
On the Insert menu, click Slides from Files.
In the Slide Finder dialog box, click the Find Presentation tab.
Click Browse, locate and select the presentation that contains the image slide, and then click Open.
In the Slides from Files dialog box, select the image slide.
Select the Keep source formatting check box. If you do not select this check box, the copied slide will inherit the design of the slide that precedes it in the presentation.
Click Insert.
Click Close.

14. Deposition by Wind To insert this slide into your presentation
Save this template as a presentation (.ppt file) on your computer.
Open the presentation that will contain the image slide.
On the Slides tab, place your insertion point after the slide that will precede the image slide. (Make sure you don't select a slide. Your insertion point should be between the slides.)
On the Insert menu, click Slides from Files.
In the Slide Finder dialog box, click the Find Presentation tab.
Click Browse, locate and select the presentation that contains the image slide, and then click Open.
In the Slides from Files dialog box, select the image slide.
Select the Keep source formatting check box. If you do not select this check box, the copied slide will inherit the design of the slide that precedes it in the presentation.
Click Insert.
Click Close.