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Wind Erosion

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Sand dune

A deposit of wind-blown sand.

Deflation

Wind erosion that removes surface materials.

Loess

Fine, yellowish-brown topsoil made up of particles of silt and clay, usually carried by the wind.

Identify the two types of wind erosion.

Abrasion and deflation.

Describe how the size of sediment particles effects their movement during deflation.

The more energy that wind has, the larger particles of sediment it can move. In general, small, fine particles can be picked up and blown through the air. Medium sized particles bounce and skip along the ground. And large particles slide and roll along the ground.

Wind is the __________(strongest/weakest) agent of erosion.

weakest

Loess is sediment made up of fine particles of silt that have been deposited far from their source by__________.

wind

The stronger the wind, the larger the particles it _________(deposits/erodes).

erodes

Sand dunes are formed by _______________(deflation/deposition).

deposition

What are two things that form through wind deposition?

Sand dunes and loess deposits form through wind deposition.

The main way that the wind erodes is by the process of _____________.

deflation

Explain the formation and movement of sand dunes.

When wind carrying sand slows down or is trapped by some obstacle, such as a boulder or a plant, the sand gets deposited. As the sand accumulates, a sand dune can form. Dunes often form on beaches or in deserts. Sand dunes move over time as, little by little, sand grains get moved by the wind from one side of the dune to the other.

Describe the process of deflation.

As wind blows over the ground it picks up small particles of sediment in the process of deflation.

fine sediment

loess

The stronger the wind, the larger the particles it erodes.

True

Wind causes erosion through ablation and abrasion.

False

Abrasion can polish rock surfaces.

True

Loess helps to form very fertile soil.

True

The process by which wind removes surface materials is called:
A. abrasion
B. plucking
C. deflation
D. inflation

C. deflation

Which of the following processes is a type of wind erosion?
A. plucking
B. abrasion
C. inflation
D. chemical weathering

B. abrasion

Particles of clay and silt eroded and deposited by the wind are called
A. till.
B. loess.
C. dust.
D. sod.

B. loess.

Wind carrying sand grains deposits the sand when the wind
A. speeds up.
B. crosses a depression in the ground.
C. slows down or hits and obstacle.
D. cools after nightfall.

C. slows down or hits an obstacle.

The oddly shaped stone shapes seen in deserts are the result of wind erosion.

True

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