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Chapter 7 Section 2
Shoreline Erosion and Deposition
13
Science
7th Grade
11/14/2008

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Term
Saltation
Definition

The movement of sand or other sediments by short jumps and bounces that is caused by wind or water.

Term
Deflation
Definition

A form of wind erosion in which fine, dry soil particles are blown away.

Term
Abrasion
Definition

The grinding and wearing away of rock surfaces through the mechanical action of other rock or sand particles.

Term
Deflation hollows
Definition

Areas where there is little vegetation, the wind may scoop out depressions in the landscape.

Term
Loess
Definition
Very fine sediments deposited by the wind.
Term
Dune
Definition
A mound of wind deposited sand that keeps its shape even though it moves.
Term

What does erosion do?

Definition

Erosion moves soil, sand, and rock particles and transports them from one place to another.

Term

What areas are more vulnerable to wind erosion?

Definition

Places with little plant cover can be severely affected by wind erosion because plant roots anchor sand and soil in place. Deserts and coastlines that are made of fine, loose material and have little plant cover are shaped most dramatically by the wind.

Term

What does abrasion do to rocks?

Definition

It creates a sand blasting effect which helps to erode, smooth, and polish rocks.

Term

Where did many loess deposits come from?

Definition

Many loess deposits came from glacial sources during the last ice age.

Term

What are the steps of dune formation?

Definition

The wind hits an obstacle, such as a plant or a rock, the wind slows down. As it slows, the wind deposits, or drops, the heavier material. The material collects, which creates an additional obstacle. This obstacle causes even more material to be deposited, forming a mound. Eventually, the original obstacle becomes buried, forming a dune.

Term

How do dunes move?

Definition

Dunes move in the direction of strong wind. The side that the wind is on becomes the windward slope. The opposite side becomes the slip face, which is very steep.

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