Wind performs three processes which are
1. Wind erosion
Is the breaking, wearing and removal of rocks and soil from one place to another by wind.
|Note:Erosion is the wearing and breaking down of rocks (attrition) and the transportation/removal of broken down pieces from one place to another by;i. Waterii. Glaciers (moving ice)
v. Gravity (all these are called agents)
Weathering is the breaking down of rocks into smaller pieces in situ.
In situ: means in original position. (That is, there is no transportation involved in weathering, ua utloa?
Three processes of wind erosion
1. Abrasion (a-bray-tjin): wearing away of rocks and removal of soil by particles or load carried by wind.
2. Deflation (di-flay-tjin): removal of loose material from the earth’s surface.
3. Attrition (a-tri-tjin): is when wind cause rocks and boulders on the surface to bump into each other and to break up into smaller pieces
Features formed from wind Erosion (Abrasion, Deflation & Attrition)
a) Rock pedestal/Mushroom Rock
b) Inselbergs is German. It means an Island mountain
2 Wind Transportation
This is the carrying of load by wind.
Three processes of Wind Transportation
(c) Traction/Rolling/Surface Creep
(a) Suspension: Silt, sand particles and clay sized particles are carried within the wind
(b) Saltation: bigger sand particle and small stones bounce along the ground surface in a ‘leap-frog’ movement.
(c) Traction: large stones or boulders roll or are pushed over the ground surface. This needs most energy. This is related to Abrasion in erosion that is discussed above. Simple eh?
3. Wind Deposition
This is as simple as dropping of the load carried by wind.
No processes involved but there are conditions that lead to deposition.
- These are:
- When wind loses strength to carry/transport
- When wind comes across forest
- It begins with the heaviest material first.
(a) Sand ripples: wavy arrangement of sand
(b) Sand Dunes: accumulation of sand around a barrier (Bush/ stone/rock)
• Sief Dunes
(c) Loess Deposits