Part 2: Deserts & Wind Flashcards Preview

Geology 1403 Exam V > Part 2: Deserts & Wind > Flashcards

Flashcards in Part 2: Deserts & Wind Deck (12)
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25. How is an area determined it’s a desert?

moisture in the area is relatively much lower in the area than in surrounding areas, due to landscape and/or conditions

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26. Latitude desert is a result of high pressure and lack of rain, where are they located?

Latitudinal deserts occur around the 30° N and S latitudes

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27. What creates a Rain shadow desert?

depend on the location of mountains and wind direction.

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28. What is sand? Common type of sand?

Quartz is the most common due to its abundance and its resistance to weathering.

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29. Plate tectonics moves land in different positions, also plays roles in where desserts are found. Name 3 different types of erosional structures.

There are several different types of structures that may be produced by this sandblasting; among them are ventifacts, yardangs, and hoodoos

-Ventifacts are pebbles with curved or nearly flat surfaces that meet at sharp ridges.
-Yardangs are parallel ridges aligned with a prevailing wind
-Hoodoo are unusually shaped. They may take the form of a mushroom, a camel, a tower, or even an “Old Man in a Mountain.”

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30. Define Aeolian

Aeolian (also spelled “eolian”) processes are those that are powered by wind

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31. Define Coeruleus Effect, not a force.

The Earth’s rotation causes a deflection of air, water, and travel called the Coriolis Effect.

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32. Does water erode in the dessert?

Streams are the primary erosive agent in arid and desert regions

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33. What is a requirement of dune formation?

depending on the wind direction, sediment supply, surface or obstacle on which the dune forms, and of course, an arid climate

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34. How is a desert in a polar region formed?

Polar deserts form at high latitudes where there is little moisture because the air is too cold to hold much moisture.

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35. (Ancient) Loess

Ancient loess is usually glacial in origin, a rock flour formed by the abrasion of rocks frozen into the ice that are dragged across bedrock and ground to a flour-like texture.

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36. Modern Loess

Modern loess is often fine volcanic ash