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29 Cards in this Set
- Front
- Back
The 4 types of eolian environments |
Desserts Desertified regions Coast lines Glacier margins |
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Conditions for erosive sediment |
Small Dry Loose |
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How does vegetation affect wind? |
Breaks flow Catches uplifting sediment |
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Ventifacts |
Objects altered by wind sediment |
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Yardangs |
Low narrow ridges that form parallel to prevailing wind direction |
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Blow out depression |
Wind scooping out an area of sediment |
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Desert pavement |
A layer of medium and large sediment created from smaller sediment blowing away |
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Saltation |
Coarse particles too big to be picked up bouncing along the ground |
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Surface creep |
Larger rock fragments pushed across the ground by surface creep |
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What is the process of impact? |
Grains impact the ground Bounce up And repeat |
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What kind of rock is moved by suspension? |
clay and silt |
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What is the range coarse particles jump? |
.2 - 2 meters |
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True or false, dunes are approximately the same size |
False |
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Slipface |
Leeward slope of a dune |
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What are the three parts of a dune? |
Windward slope Crest Slipface |
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Erg |
Sand sea A large area covered by dunes |
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Cross bed |
A group of inclined layers of sediment on a dune |
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How can you identify a dune that has been influenced by multiple wind directions |
Cross bedding |
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Barchan |
Crescent shaped dune created by strong winds |
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Transverse dune |
Continuous ridge of sand at a right angle of the wind. Made from large sand deposits and a single direction of wind |
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Longitudinal dunes |
Long ridge dunes created by two winds with slip faces on both sides |
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Parabolic dunes |
Crescent shaped with the slipface facing away from the wind. Anchored by vegetation these are usually found in semi arid regions |
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If there is a gentle slope, is it facing toward or away from the wind direction |
Away |
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Loess |
Sedimentary deposit of dust |
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Loess are downwind from these 4 places |
Deserts Glacial meltwater streams Semi-arid floodplain Coastal areas |
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Loess are in what kind of climate? |
Steppe |
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Loess have what property when dry? |
Stand vertically |
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Loess have whay property when wet? |
erode easily |
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Loess have ____ layers, a ______ angle of repose and _____ soil |
Thick Steep Good |