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- 1. VentifactsDeflation and By Mansour Alhasawi
- 2. What type of Erosions are going on arid areas? Deflation Ventifact Yardanges Desert Pavement
- 3. Deflation What is Deflation ? A type of Deflation Example
- 4. Erosion by wind of Lifting and removal of silt and sand. What is Deflation ? Silt and Sand Deflation picked up by wind
- 5. A type of Deflation Blowouts Desert pavement 1 Desert pavement 2
- 6. A type of Deflation Blowout s Shallow depression in the ground due to deflation Wind Hole
- 7. Which one is Deflation ? Meteor Blowouts
- 9. Desert Pavement A type of Deflation wind Big and small rocks mixed with sand Removal of silt and sand by deflation, exposing and creating a layer of pebbles and cobbles. pebbles and cobbles. 1 Desert Pavement
- 12. Jal al zour Example Our Bus
- 13. Desert Pavement Getting help from water and wind , Sand creeps down underneath the layer of pebble. A type of Deflation 2 Water + Wind Desert Pavement Big and small rocks mixed with sand pebbles and cobbles.
- 14. Example Dry lake
- 15. Quiz 1) Which type of Deflation ? : A) Blowouts B) Desert Pavement 2 (Water + Wind ) C) Desert Pavement 1 (Wind)
- 16. Quiz A) Blowouts B) Desert Pavement 2 (Water + Wind ) C) Desert Pavement 1 (Wind) 2) Which type of Deflation ? :
- 17. Quiz A) Blowouts B) Desert Pavement 2 (Water + Wind ) C) Desert Pavement 1 (Wind) 3) Which type of Deflation ? :
- 18. Ventifacts What is Ventifacts ? Examples Shapes and Sizes of Ventifacts Key Facts
- 19. Choice
- 20. What is Ventifacts ? “Ventifacts are Rocks Shaped, Polished, and etched by Windblown Sand by abrasion ” Created by wind erosionFrom the Dry Valleys of Antarctica.
- 21. Shapes and Sizes of Ventifacts They Come in all Shapes and size ,from small, polished, aerodynamic pebbles to large mushroom-shaped boulders.
- 22. If the rock remains stationary for hundreds of years, the action of the sand is to create a facet,- a flat, fairly smooth surface on the rock. - Have more than one facet. - This is due to either a change in wind direction or the rock shifts its position relative to the wind”
- 24. Larger ventifacts like the one below often take on an exceptionally strange shape.
- 26. Key Facts 1- Look for ventifacts in exposures of desert pavement.
- 27. 2- The shape can indicate wind direction. Key Facts
- 28. Key Facts 3- Ventifacts have been identified on Mars and in Antarctica . Ventifacts on the Gusev Plains of Mars
- 31. Thank You
Editor's Notes
- loose material from flat areas of dry, uncemented sediments such as those occurring in deserts, dry lake beds, floodplains, and glacial outwash plains
- Black Mountains Near Badwater in southern Death Valley, a low, linear ridge covered in boulders of dark black volcanic rock juts out into the valley, intercepting the strong winds that often blow along the valley’s length.
- In any case, where one facet meets another a ridge separates the two.
- This is because wind (even very strong wind) is incapable of picking up anything bigger than a large grain of sand, and even then it can’t lift it more than a few feet off the ground. The result is that the bottom two or three feet of the bounder gets abraded away, while the top remains relatively intact, leading to the classic “hourglass” shape of large ventifacts.