Term
| What are two factors that reduce wind erosion power? |
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Definition
| The presence of vegetation and water in the surface soil. |
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Term
| What are 4 locations of drylands and what are they caused by? |
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Definition
Subropical Regions - stable descending air (high pressure cells)
Interior Continental Regions - no moisture bearing weather systems
Lee of Mountain Zones - rain shadow effects
Certain Western Coastlines - cold ocean current suppress sea surface evaporation |
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Term
| What are 2 types of eolian erosion? |
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Definition
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Term
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Definition
| The removal and lifting of individual loose particles |
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Term
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Definition
| Grinding of rock surfaces with a sandblasting action by particles captured in the air |
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Term
| What are two landforms caused by deflation? |
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Definition
| Blowout Depression (basin left when materials are removed) and Desert Pavement (thin layer of large particles) |
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Term
| What are two landforms caused by abrasion? |
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Definition
| Ventifacts (aerodynamically shaped rocks) and Yardang (an elonged, streamlined ridged) |
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Term
| What are 3 types of eolian transportatin? |
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Definition
| Suspension, Saltation, and Surface Creep |
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Term
| Winds cannot move particles larger than... |
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Definition
|
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Term
| When does eolian deposition occur? |
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Definition
| When wind speeds fall below the threshold to transport particles |
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Term
| What are two landforms formed by eolian deposition? |
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Definition
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Term
| What are the 5 steps of dune formation? |
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Definition
| Sand Patch Initiation, Wind-Ripple Protodune, Streamlined Protodune, Protodune, and Dune with slipface |
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Term
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Definition
| Saltation of particles up the windward slope and over dune, sediment falls down slipface |
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Term
| What are the 4 broad classes of dunes? |
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Definition
| Cresentic, Linear, Star, and Other |
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Term
| What determines the type of dune? |
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Definition
| Wind strength and consistency, sand supply, and the amount of vegetative cover |
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Term
| Describe desertification. |
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Definition
| The expansion of Earth's desert lands and degradation of dry lands |
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Term
| What are the 2 causes of desertification? |
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Definition
| Climate variation and unsustainable land use |
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Term
| What are 4 consequences of desertification? |
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Definition
| Loss of soil productivity, crop failures, scarcity of fuel wood, and reduced availability of grazing land |
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Term
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Definition
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Term
| What is a wash or arroyo? |
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Definition
| Steep-sided ephemeral channels |
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Term
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Definition
| In arid regions and has no outlets, its internal drainage is evaporation |
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Term
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Definition
| Intermittent stream flow deposition |
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