By: Gabriella Simone

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Chapter 16.1

• By Gabriella Simone
• And
• Jessica Roldan

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Section Objections

• Describe two ways that the wind erodes the land
• Compare the two types of wind

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Wind Erosion

• Much energy that is found in the wind can be used
  to turn a wind turbine or move a sailboat.
• When wind erodes land, it carries rock particles
  that are different sizes.
• Wind also moves sand and dust in different ways.
  For example, sand is moved along by jumps and
  bounces caused by wind or water, which is called
  saltation because wind cant keep up with the
  smallest particles of sand.
• Dust particles are lifted by the wind and carried
  high into the air. When a volcanic eruption
  occurs, the dust remains in the atmosphere for
  many years before falling to the ground. Dust
  storms are created by strong wind that lift
  enormous amounts of dust into the atmosphere.

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Effects of Wind Erosion

• The force of wind erodes in many different ways.
• Deflation- most common form of wind erosion in
  which fine, dry soil particles are blown away.
• Deflation causes shallow depressions that form in
  areas where natural plant cover has been removed.
  As an are of dry soil, bare soil will be exposed
  to wind. The wind will then strip off the
  topsoil.
• Desert Pavement- surface of closely packed small
  rocks left after the top layer of soil has been
  removed by deflation.
• Desert pavements is more commonly shown in dry
  climates because wind erosion takes place faster
  in dry climates than in humid.
• Deflation Hollow- shallow depression left after
  the wind has eroded a layer of exposed soil.
• Ventifact- any stone smoothed by wind abrasion.

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Wind Deposition

• All material that is eroded by wind is eventually
  deposited. The winds speed has a part in
  determining the size of the particles.
• The cementing action of minerals carried in water
  and pressure are two factors that bind the
  fragments to form sedimentary rock.

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Dunes

• Dunes- mound of windblown sand.
• Places to find dunes are some deserts, large
  lakes, and along the shores of oceans
• A slipface is the sand thats blown over a peak
  or a crest of the dune and that tumbles down the
  opposite side.
• Other types of dunes include, barchan, parabolic,
  transverse, and longitudinal.
• The direction and force of the wind results in
  the complicated shape of dunes.
• Dune migration occurs when sand is blown over the
  crest, off the windward side or is built up on
  the slipface.

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Loess

• Loess- thick, yellowish deposit of wind blown
  dust.
• Loess is found mostly in northern China. It
  originally came from the Goby Desert. Loess
  deposits provide good soil for grain- growing
  regions because, its very fertile.

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Loess
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The End
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