wind swbat describe conditions that contribute to the likelihood that an area will experience wind...
TRANSCRIPT
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WindWind
SWBAT describe conditions that contribute to the SWBAT describe conditions that contribute to the likelihood that an area will experience wind erosion; likelihood that an area will experience wind erosion;
identify wind-formed landscape features; describe how identify wind-formed landscape features; describe how dunes form and migrate; explain the effects of wind dunes form and migrate; explain the effects of wind
erosion on human activities erosion on human activities
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• What is unusual about the surface of these rocks?
• What do you think shaped these rocks?
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Wind Erosion and TransportWind Erosion and Transport
• Two methods for wind to move sand– Suspension
• Wind lifts and keeps the particles airborne for a long distance
– Saltation• Particles bounce along the ground
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Wind Erosion and TransportWind Erosion and Transport
• Where does wind erosion primarily occur?– Wind erosion is most common in areas with
little vegetative cover, semi-arid areas, as well as seashores or lakeshores
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Wind Erosion and TransportWind Erosion and Transport
• Deflation– The lowering of the land surface as a result of
surface particles being removed by wind
• Abrasion– Occurs when particles such as sand rub
against the surface of rocks or other materials
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Wind Erosion and TransportWind Erosion and Transport
• Why is sand such an effective agent of wind erosion?– Sand is generally made up of quartz, which is
a very hard mineral that can scratch away at surfaces
• Ventifacts– Rocks shaped by wind blown sediments
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Wind DepositionWind Deposition
• How is wind deposition similar to water deposition?– They both erode sediments, and the
sediments are dropped when they slow down
• Dune– A pile of wind-blown sand that accumulates
on an object
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Dune FormationDune Formation
• What conditions determine a sand dunes shape?– Sand availability– Wind velocity– Wind direction– Amount of vegetation
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Dune FormationDune Formation
Barchan
Transverse
Parabolic
Longitudinal
Solitary, crescent-shaped dunes
Form in flat areas with little vegetation
Long series of ridges that are perpendicular to the wind
Form in areas with lots of sand and strong steady winds
U shaped Form in humid areas between clumps of plants
Long series of ridges that are parallel to the wind
Form in areas with limited sand and strong prevailing winds
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Wind DepositionWind Deposition
• Loess– Thick wind blown deposits of silt and fine
sediment
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Get Your Lab NotebooksGet Your Lab Notebooks
• In your groups complete the minilab on page 194
• Title: Where does wind erosion occur• Using the map on page 192, answer the 3
analyze and conclude questions in complete sentences.
• When you finish you may start the assessment questions 1-6 on page 197, you may work in your groups