Aeolian Processes

Question 1

What are the aeolian processes?

Answer 1

Abrasion (main)
Deflation (main)
Suspension
Saltation
Surface creep
Deposition

Question 2

Explain abrasion

Answer 2

• Material carried by the wind is blasted at rock surfaces, causing them to wear away, making rough edges smoother and flatter
• It is affected by the speed and direction of the wind, as well as the amount of erosive material being carried by it
• Desert rocks are most susceptible as they lack a protective layer of soil and vegetation, so they are constantly exposed to the wind
• Most susceptible 1.5m from the ground

Question 3

Explain deflation

Answer 3

• Fine, loose sediments are picked up and removed by the wind
• More susceptible in dry, sandy conditions where there is a lack of vegetation, due to the lack of moisture holding the sand together
• Any rocks are left behind and cause a desert pavement

Question 4

Explain suspension

Answer 4

Fine sands, less than 0.1mm in diameter, are lifted up and carried by winds

Question 5

Explain saltation

Answer 5

Small particles between 0.1mm and 1mm in diameter bounce along the ground, up to 1.5m

Question 6

Explain surface creep

Answer 6

Larger particles, over 1mm in diameter, are too heavy to be lifted, so they roll along the ground

Question 7

Explain deposition

Answer 7

• Fine sediment builds up in sheltered areas behind rocks and vegetation, when wind speed drops or an obstacle is met
• The larger an obstacle is, the larger the deposition